7758-09-0

Basic information

• Product Name: Potassium nitrite(III)
• Synonyms: Nitrousacid, potassium salt (8CI,9CI);E 249;Klear;Nitrous acid, potassiumsalt (1:1);Potassium nitrite (1:1)
• CAS NO: 7758-09-0
• Molecular Formula: KNO2
• Molecular Weight: 85.11
• EINECS: 231-832-4
• Mol File: 7758-09-0.mol

Chemical Properties

• Appearance: white to yellow crystals
• Density: 1,92 g/cm³
• CAS DataBase Reference: Potassium nitrite(III)(CAS DataBase Reference)
• NIST Chemistry Reference: Potassium nitrite(III)(7758-09-0)
• EPA Substance Registry System: Potassium nitrite(III)(7758-09-0)

Safety Data

• Hazardous Substances Data: 7758-09-0(Hazardous Substances Data)

Usage

Uses

Used in Fireworks Production:
Potassium nitrite(III) is used as an oxidizing agent in the production of fireworks, enhancing the intensity and color of the pyrotechnic displays.
Used in Chemical Reactions:
In the chemical industry, potassium nitrite(III) serves as an oxidizing agent, facilitating various chemical reactions that require an increase in the oxidation state of other substances.
Used in Meat Preservation:
Potassium nitrite(III) is used as a preservative in the meat industry to prevent spoilage and bacterial growth, particularly in cured meats, ensuring food safety and extending shelf life.
Used in Dye Manufacturing:
In the dye industry, potassium nitrite(III) is utilized in the synthesis of various dyes, contributing to the color development and stability of the final products.
Used in Pharmaceutical Production:
Potassium nitrite(III) is employed in the manufacturing of certain pharmaceuticals, where its oxidizing properties are harnessed for specific medicinal applications.
Used as a Food Preservative:
In the food industry, potassium nitrite(III) is used as a preservative to prevent the growth of harmful bacteria, particularly in cured and processed meats, ensuring food safety and quality.
It is crucial to handle potassium nitrite(III) with care due to its strong oxidizing nature, which can lead to violent reactions with organic materials. To mitigate the risk of methemoglobinemia, a condition that impairs the blood's oxygen-carrying capacity, it is essential to avoid ingestion or inhalation and to handle the compound in a well-ventilated area with appropriate protective equipment.

InChI:InChI=1/K.HNO2/c;2-1-3/h;(H,2,3)/q+1;/p-1

Synthetic route

potassium chloride + sodium nitrite (7632-00-0) → potassium nitrite (7758-09-0)

Conditions	Yield
In water 88-97 % KNO2 content after evapn. to dryness and recrystn.; NaCl removed by pptn. by AgNO2 or AgNO3;	91%
In water 88-97 % KNO2 content after evapn. to dryness and recrystn.; NaCl removed by pptn. by AgNO2 or AgNO3;	91%

potassium cyanide + silver (7440-22-4) → potassium nitrite (7758-09-0) + potassium nitrate

Conditions	Yield
	A <1 B 65.2%
	A <1 B 65.2%

difluoro-nitro-methane (1493-05-6) + potassium tert-butylate (865-47-4) → potassium fluoride + potassium nitrite (7758-09-0) + Diethyl carbonate (105-58-8)

Conditions	Yield
In tetrahydrofuran byproducts: NO3(1-); alkoxide soln. addn. to F2C(NO2)2 soln. (molar ratio F2C(NO2)2:nucleophile=1:2), reacting (-10°C for 10-15 min), stirring (0°C for 1 h, further at 20°C for 2 h); salts. ppt. sepn. (CH2Cl2 addn.) after 1 d; chem. and GLC anal.;	A 43% B n/a C 11%

difluoro-nitro-methane (1493-05-6) + potassium tert-butylate (865-47-4) → potassium fluoride + potassium nitrite (7758-09-0)

Conditions	Yield
In N,N-dimethyl-formamide alkoxide soln. addn. to F2C(NO2)2 soln. (molar ratio F2C(NO2)2:nucleophile=1:2), reacting (-10°C for 10-15 min), stirring (-50°C,then at 0°C for 2 d); salts. ppt. sepn. (CH2Cl2 addn.); chem. and GLC anal.;	A 19% B 25%

potassium cyanide → potassium nitrite (7758-09-0) + potassium nitrate

Conditions	Yield
With clay; soda lime; oxygen 370°C;with air;	A 2.6% B 23.2%
With O2; soda lime; clay 370°C;with air;	A 2.6% B 23.2%

difluoro-nitro-methane (1493-05-6) + potassium ethoxide (917-58-8) → potassium fluoride + potassium nitrite (7758-09-0) + Diethyl carbonate (105-58-8)

Conditions	Yield
In ethanol; dichloromethane alkoxide soln. (EtOH) addn. to F2C(NO2)2 soln. (CH2Cl2) (molar ratio F2C(NO2)2:nucleophile=1:1), reacting (-10°C for 10-15 min), stirring (0°C for 1 h); salts. ppt. sepn. (CH2Cl2 addn.); chem. and GLC anal.;	A n/a B n/a C 8%

potassium carbonate (584-08-7) → potassium nitrite (7758-09-0)

Conditions	Yield
With nitrous gas In water excluding air; nitrous gas, obtained by redn. of HNO3 by As2O3 or starch, introduced in concd. soln. until complete neutralization; NO in small excess compared to NO2;
In water double reaction of Ba-, Ag- or K-Pb-nitrite with K2CO3; soln. concd. in vacuo, dried in H2 at ambient temp. then at 100 °C;
In water double reaction of Ba-, Ag- or K-Pb-nitrite with K2CO3; soln. concd. in vacuo, dried in H2 at ambient temp. then at 100 °C;
With nitrous gas In water excluding air; nitrous gas, obtained by redn. of HNO3 by As2O3 or starch, introduced in concd. soln. until complete neutralization; NO in small excess compared to NO2;

potassium carbonate (584-08-7) + sodium nitrite (7632-00-0) → potassium nitrite (7758-09-0)

Conditions	Yield
In water for prepn. of large quantities; KNO2 content 85-99.8 %;	>=72
In water for prepn. of large quantities; KNO2 content 85-99.8 %;	>=72

barium sulfide + potassium nitrate → potassium nitrite (7758-09-0)

Conditions	Yield
heating in iron crucible to glow;
heating in iron crucible to glow;

silver(I) nitrite (7783-99-5) + potassium chloride → potassium nitrite (7758-09-0)

Conditions	Yield
In water pure KNO2 if AgNO2 was prepd. from NaNO2 purified by recrystn.;
In water pure KNO2 if AgNO2 was prepd. from NaNO2 purified by recrystn.;

lead(II) oxide + potassium nitrate → potassium nitrite (7758-09-0) + lead(II,IV) oxide

Conditions	Yield
heating;;
heating;;

potassium sulfide + sulfur dioxide (7446-09-5) + potassium nitrate → potassium nitrite (7758-09-0)

Conditions	Yield
In melt byproducts: K2SO4, K2SO3; in melt at 330°C;

nitrogen(II) oxide (10102-43-9) + potassium (7440-09-7) → potassium nitrite (7758-09-0) + nitrogen (7727-37-9)

nitrogen(II) oxide (10102-43-9) + potassium (7440-09-7) → potassium nitrite (7758-09-0) + potassium nitrate

Conditions	Yield
ignition;
In not given ignition of heated K in NO, formation of KNO2, KNO3;;

potassium (7440-09-7) + dinitrogen monoxide (10024-97-2) → potassium nitrite (7758-09-0) + nitrogen (7727-37-9)

Conditions	Yield
In not given formation of KNO2 by a long (enough) reactn.time; appearance of NO (forming by thermical decompn. of N2O);;

potassium (7440-09-7) + Nitrogen dioxide (10102-44-0) → potassium nitrite (7758-09-0) + potassium nitrate

Conditions	Yield
inflammation of K at room temp.;
In not given ignition of heated K in NO2, formation of KNO2, KNO3;;
inflammation of K at room temp.;

lead (7439-92-1) + potassium nitrate → potassium nitrite (7758-09-0)

Conditions	Yield
1 part of KNO3 melted with 2 part of Pb; boiling the melt with H2O, KNO2 pptd. with alcohol;
1 part of KNO3 melted with 2 part of Pb; boiling the melt with H2O, KNO2 pptd. with alcohol;

copper (12775-96-1, 15158-11-9, 15721-63-8, 16941-75-6, 17493-86-6, 19498-52-3, 20499-83-6, 20499-84-7, 20499-85-8, 20499-86-9, 20573-10-8, 20573-11-9, 21595-51-7, 21595-52-8, 22206-52-6, 26445-28-3, 28959-95-7, 37362-93-9, 39417-05-5, 54603-16-6, 54603-23-5, 54603-32-6, 54603-40-6, 54603-48-4, 54603-81-5, 54603-89-3, 56316-56-4, 95985-91-4, 122297-32-9, 7440-50-8) + potassium nitrate → potassium nitrite (7758-09-0)

Conditions	Yield
melted with finely powd. Cu;
With KOH more easily if Cu is of electrolytic quality;
melted with finely powd. Cu;
With potassium hydroxide more easily if Cu is of electrolytic quality;

iron (7439-89-6) + potassium nitrate → potassium nitrite (7758-09-0)

Conditions	Yield
vac.;
melted with much Fe filings to moderate glow;
vac.;
melted with much Fe filings to moderate glow;

hydrogen + potassium nitrate → potassium nitrite (7758-09-0) + ammonia (7664-41-7)

Conditions	Yield
In water redn. of KNO3 in aq. soln. at normal temp. by Pd black, laden with H;;
In water redn. of KNO3 in aq. soln. at normal temp. by Pd black, laden with H;;

indium (7440-74-6) + potassium nitrate → potassium nitrite (7758-09-0) + indium(1+)

Conditions	Yield
In water Kinetics; reaction of aq. solns. of starting materials at room temp.; IR-spectroscopy;

potassium nitrate + zinc (7440-66-6) → potassium nitrite (7758-09-0)

Conditions	Yield
With ammonia In water added NH3 to aq. soln. of KNO3 satd. at 30-40 °C then Zn under cooling; filtered, Zn pptd. by CO2, neutralized; KNO3 crystallizes first;
With NH3 In water react. rate and yield increased by excess of NH3 and by holding temp. 20-25 °C;
With NH3 In water added NH3 to aq. soln. of KNO3 satd. at 30-40 °C then Zn under cooling; filtered, Zn pptd. by CO2, neutralized; KNO3 crystallizes first;
With ammonia In water react. rate and yield increased by excess of NH3 and by holding temp. 20-25 °C;

n-Amyl nitrite (463-04-7) + potassium hydroxide → potassium nitrite (7758-09-0)

Conditions	Yield
In ethanol CP KNO2 with KOH (dissolved in alcohol) not in excess;
In ethanol CP KNO2 with KOH (dissolved in alcohol) not in excess;

2K(1+)*Pb(2+)*3NO2(1-)*NO3(1-)=K2Pb(NO2)3NO3 → potassium nitrite (7758-09-0) + nitrogen(II) oxide (10102-43-9) + lead(II) oxide + Nitrogen dioxide (10102-44-0) + potassium nitrate

Conditions	Yield
at 320°C;
at 320°C;

K(1+)*CN(1-)*K(1+)*NO2(1-)*0.5H2O=KCN*KNO2*0.5H2O → potassium cyanide + potassium nitrite (7758-09-0)

Conditions	Yield
With water
With H2O

6K(1+)*2{Co(NO2)6}(3-)*3H2O → cobalt(III) oxide + potassium nitrite (7758-09-0) + water (7732-18-5) + nitrogen(II) oxide (10102-43-9) + potassium nitrate

Conditions	Yield
heating in vacuum;;
heating in vacuum;;

potassium nitrate → potassium nitrite (7758-09-0) + potassium peroxide + potassium (7440-09-7) + Nitrogen dioxide (10102-44-0)

Conditions	Yield
byproducts: O2; Electrolysis; graphite electrodes; the graphite electrode is dissolved by the formed peroxide and K2CO3 and K2O are formed; with metal electrode is the yield of KNO2 lower;
byproducts: O2; Electrolysis; aluminium or graphite cathode; the graphite electrode is dissolved by the formed peroxide and K2CO3 and K2O are formed;

potassium nitrate → potassium nitrite (7758-09-0) + nitrogen (7727-37-9) + ammonia (7664-41-7)

Conditions	Yield
With K2SO4 In water Kinetics; Electrolysis; at -2.9 V versus Ag/AgCl at amb. temp.;

potassium nitrate → potassium nitrite (7758-09-0) + oxygen

potassium nitrate → potassium nitrite (7758-09-0)

Conditions	Yield
hydrated tin dioxide In water Irradiation (UV/VIS); redn. of KNO3 to KNO2 in aq. soln. by sunlight in presence of colloid tin(IV) oxide hydrate;;
byproducts: O2; dissocn. pressures are given at various temp.;
byproducts: O2; strong heating;

potassium nitrite (7758-09-0) → nitrogen(II) oxide (10102-43-9)

Conditions	Yield
With sulfuric acid; water at 20℃; under 375.038 Torr; for 2.22222E-05h; Pressure; Reagent/catalyst; Temperature; Time;	99.98%
With sulfuric acid; potassium iodide In not given byproducts: H2O, I2; washing with NaOH soln.;
above 500 °C, based on spect. results;

potassium nitrite (7758-09-0) + {Au(H2NCH2CH(NH2)CH3)2}(3+)*3ClO4(1-)*H2O={Au(H2NCH2CH(NH2)CH3)2}(ClO4)3*H2O → {Au(H2NCH2CH(CH3)NNO)(H2NCH2CH(CH3)NH2)}(2+)*2ClO4(1-)*H2O={Au(H2NCH2CH(CH3)NNO)(H2NCH2CH(CH3)NH2)}(ClO4)2*H2O

Conditions	Yield
With HClO4 In water byproducts: KClO4; addn. of soln. of KNO2 to soln. of complex over 10 min, addn. of 1 M HClO4 up to pH 3; filtering after 3 d, evapn. in vac. until pptn. of KClO4, addn. of EtOH, filtration, concg., addn. of dioxane, filtration, addn. of dioxane and EtOH, addn. of ether with stirring, filtering ppt., washing with ether, drying in vac. over P2O5; elem. anal.;	97%

potassium nitrite (7758-09-0) + sulfur dioxide (7446-09-5) + potassium hydrogencarbonate (298-14-6) → dipotassium hydroxylamine-N,N'-disulfonate dihydrate

Conditions	Yield
In water cooling down to 0°C, shaking; recrystn.;	97%

potassium nitrite (7758-09-0) + cobalt(II) nitrate → potassium hexakis(nitrito)cobaltate(III)

Conditions	Yield
With CH3COOH In water byproducts: CH3COOK, NO, H2O; Co(NO3)2 and KNO2 (1:7) combined; acetic acid added (Co(NO3)2:CH3COOH=1:2) at 70+/-5°C under stirring; mixt. stirred at a rate of 500+/-50 rpm for 30 min; ppt. allowed to settle for 15-16 h; crystals washed (H2O) until pH about 4.5; solid filtered; dried at 90+/-%°C for 32 h; elem. anal.;	97%

potassium nitrite (7758-09-0) + chlorine (7782-50-5) + palladium (7440-05-3) → potassium tetranitropalladate (II)

Conditions	Yield
In water suspn. of Pd powder in distd. water was treated with Cl2 until all Pd dissolved, purged with N2, filtered, KNO2 was added; crystd. at 278 K; elem. anal.;	95%

ammonium hexafluorophosphate + potassium nitrite (7758-09-0) + [ruthenium(II)(chloride)(η6-p-cymene)(2,2’-bipyridine)][hexafluorophosphate] (159310-08-4) + silver nitrate → [(η6-p-cymene)Ru(2,2'-bipyridine)NO2]PF6

Conditions	Yield
In methanol byproducts: AgCl; under inert atm. to Ru complex and AgNO3 in MeOH KNO2 was added and stirred for 18 h; excess NH4PF6 was added and cooled in ice bath, ppt. was filtered and stirred in acetone for 10 min, soln. was filtered and concd. in vacuo, Et2O was added, ppt. was filtered and washed with Et2O; elem. anal.;	93.1%

potassium nitrite (7758-09-0) + Pt(4+)*NH2(CH2)2NH(CH2)2NH2*3Cl(1-)*NO2(1-)={Pt(NH2(CH2)2NH(CH2)2NH2)ClNO2Cl}Cl → Pt(4+)*NH2(CH2)2NH(CH2)2NH2*2Cl(1-)*2NO2(1-)={Pt(NH2(CH2)2NH(CH2)2NH2)ClNO2Cl}NO2

Conditions	Yield
In water addn. of KNO2 in H2O to a soln. of Pt-complex in H2O (molar ratio complex:KNO2=1:5), pptn. after 1-2 min, cooled in an ice bath; filtered, washed (several drops of icy water, EtOH and ether); elem. anal.;	93%

potassium nitrite (7758-09-0) + {C5H5Ni(P(C4H9-n)3)2}Cl → {C5H5Ni(P(C4H9-n)3)2}NO2

Conditions	Yield
In water anion exchange in aq. soln.; molar ratio (C5H5Ni(P(C4H9-n)3)2)(1+)Cl(1-):KNO2 = 1:3; between O°C and room temp.; product dissolved in benzene; recrystn. from hexane or benzene/hexane in the presence of P(C4H9-n)3;	91%
In water

potassium nitrite (7758-09-0) + ruthenium(III)chloride (10049-08-8) → potassium sodium hexanitroruthenate(II)*H2O

Conditions	Yield
With Na(1+); Cl2 In hydrogenchloride heating on a water bath for 30 min; filtn. and dissolving in a minimum of water; elem. anal.;	90%

potassium nitrite (7758-09-0) + potassium chloro(pyridine-2,6-dicarboxylato)platinate(II) hydrate (117581-24-5) + silver nitrate → potassium nitro(pyridine-2,6-dicarboxylato)platinate(II) dihydrate (119695-31-7)

Conditions	Yield
In water byproducts: AgCl; soln. of KNO2 added slowly to the soln. of Pt-complex (70°C), stirring (1 h); addn. of AgNO3, AgCl filtered off, soln. cooled slowly to room temp.; crystals filtered off and dried (vac.); elem. anal.;	90%

potassium nitrite (7758-09-0) + [Pt(O2CCF3)(C6Cl5)(P(C6H5)3)2] (84330-57-4, 112711-85-0) → Pt(2+)*NO2(1-)*C6Cl5(1-)*2P(C6H5)3=[Pt(NO2)(C6Cl5)(P(C6H5)3)2]

Conditions	Yield
In acetone slight excess of KNO2 added to soln. of Pt complex in acetone, left at room temp. for 4 h; concd. in vac., recrystd. from CH2Cl2/MeOH; elem. anal.;	90%

potassium nitrite (7758-09-0) + 2K(1+)*[Pt(H2NC2H4SO3)2Cl2](2-)*2H2O=K2[Pt(H2NC2H4SO3)2Cl2]*2H2O → 2K(1+)*[Pt(H2NC2H4SO3)2(NO2)2](2-)=K2[Pt(H2NC2H4SO3)2(NO2)2]

Conditions	Yield
In water addn. of a satd. soln. of KNO2 to that of the Pt-compd. (ratio 2 : 1, 80°C, 30 min); ppt. filtered off, washed (H2O) and dried (over P2O5); elem. anal.;	90%

potassium nitrite (7758-09-0) + 2K(1+)*Pt(NH2CH2CH2SO3)2Cl2(2-)*5H2O=K2(Pt(NH2CH2CH2SO3)2Cl2)*5H2O → 2K(1+)*[Pt(H2NC2H4SO3)2(NO2)2](2-)=K2[Pt(H2NC2H4SO3)2(NO2)2]

Conditions	Yield
In water byproducts: KCl; satd. solns. (1 : 2), 80°C (30 min); ppt. filtered off, washed (H2O) and dried (over P2O5); elem. anal.;	90%
In water addn. of a satd. soln. of KNO2 to that of the Pt-compd. (ratio 2 : 1, 80°C, 30 min); ppt. filtered off, washed (H2O) and dried (over P2O5); elem. anal.;	90%

di(pyridin-2-yl)amine (1202-34-2) + potassium nitrite (7758-09-0) + copper(II) acetate monohydrate (6046-93-1) → [Cu(di-2-pyridylamine)2(ONO)]NO2

Conditions	Yield
In methanol; water aq. soln. of Cu salt added to soln. of org. compd. in MeOH, then added aq. soln. of KNO2; allowed to stand for 1 wk, filtered, washed with mother liquor, air-dried; elem. anal.;	90%

potassium nitrite (7758-09-0) + [2-(N,N-dimethylaminomethyl)phenyl]di-n-butyltin(IV) chloride (215306-19-7) → C17H30N2O2Sn

Conditions	Yield
In tetrahydrofuran; benzene at 30℃; for 48h; Inert atmosphere; Schlenk technique;	90%

potassium nitrite (7758-09-0) + hydrazin sulfate → nitrogen (7727-37-9) + dinitrogen monoxide (10024-97-2) + trans-hyponitrous acid (19467-31-3, 173728-04-6)

Conditions	Yield
In not given at room temp. or upon boiling from equimolar amounts in 3% solns.; no formation of H2N2O2 even in concd. solns. at low temps.; mole ratio of N2O:N2 depends on the mole ratio nitrite:hydrazonium salt;;	A 11% B 89% C 0%

potassium nitrite (7758-09-0) + (2-(N,N-dimethylaminomethyl)phenyl)(n-Bu)SnCl2 (215306-21-1) → C13H21N3O4Sn

Conditions	Yield
In tetrahydrofuran; benzene at 30℃; for 48h; Inert atmosphere; Schlenk technique;	88%

potassium nitrite (7758-09-0) + dichloro(pentamethylcyclopentadienyl)rhodium (III) dimer → K[Rh(pentamethylcyclopentadienyl)(NO2)3]

Conditions	Yield
In acetone N2-atmosphere; refluxing of excess NaNO2 with Rh-complex (15 h); filtration, washing (acetone), solvent removal from filtrate (vac.), crystn. (CH2Cl2/hexane); elem. anal.;	86%

potassium nitrite (7758-09-0) → hydroxylamine hydrochloride (5470-11-1)

Conditions	Yield
With hydrogenchloride; sulfur dioxide In water byproducts: H2SO4; react. in water contg. ice and K-acetate leading SO2 into it,mixing,at 0°C;filtering,washing with 0.5 n HCl,hydrolysis at 100°C,for 2h; pptg. of H2SO4 with BaCl2,filtering,evapn.;	85%

potassium dodecahydro-closo-dodecaborate + potassium nitrite (7758-09-0) + tetrabutyl-ammonium chloride (1112-67-0) → 2(C4H9)4N(1+)*B12H11NO(2-)=((C4H9)4N)2B12H11NO + 4(C4H9)4N(1+)*[B12H11N(O)]2(4-)=((C4H9)4N)4[B12H11N(O)]2

Conditions

Yield

With hydrogenchloride In hydrogenchloride; water byproducts: KCl, H2O; KNO2 in H2O was added dropwise to aq. HCl (37.8%) soln. of B-compd. at 0°C (temp. was not allowed to rise above 5-7 °C, mixt. was kept at 0. degree.C for 1 h and at room temp. until soln. was not conta ined NO2(1-)-ion; concn. (vac., 30 °C), EtOH was added, filtn. and evapn. in vac. at 30 °C, drying at room temp. in high-vac. for 1 h, MeCN was added, chromy. (silica, MeCN-CHCl3=1:1) (2 fraction), evapn., H2O was added,Bu4NCl was added in H2O, elem. anal.;

A 85% B 24%

potassium nitrite (7758-09-0) + [Fe((1E,1'E)-N,N'-(propane-1,3-diyl)bis(1-(1-methyl-1H-imidazol-2-yl)methanimine))(MeCN)2](BF4)2 → [Fe((1E,1'E)-N,N'-(propane-1,3-diyl)bis(1-(1-methyl-1H-imidazol-2-yl)methanimine))(NO2)2]

Conditions	Yield
With 18-crown-6 ether In N,N-dimethyl-formamide at 20℃; for 2h; Inert atmosphere; Schlenk technique;	85%

potassium nitrite (7758-09-0) + [Fe(NO)2(μ-1,3-bis(dimethylamino)-2-propanolate)Fe-(NO)2(THF)] → [Fe2(NO)4(μ-1,3-bis(dimethylamino)-2-propanolate)(μ-NO2)] + [Fe2(NO)4(μ-1,3-bis(dimethylamino)-2-propanolate)(μ-NO2)]

Conditions	Yield
With ferrocenium hexafluorophosphate In tetrahydrofuran at 0℃; Schlenk technique;	A 85% B n/a

potassium nitrite (7758-09-0) + {Pt(endpy)Cl2}Cl2*5H2O → chloronitro(bipyridyl)(N,N'-dinitroso-1,2-ethanediaminato)platinum(II) hemihydrate (85116-30-9)

Conditions	Yield
In water soln. of KNO2 in boiling water added to a soln. of the Pt-complex in boiling water, kept on a steam bath for 3 h; cooled to room temp., pptn. filtered off, washed with hot water, EtOH, and then ether, dissolved in boiling DMF, recrystd. by cooling, evapd., elem. anal.;	84%

potassium nitrite (7758-09-0) + copper(II) nitrate trihydrate + tris<2-(1-methylimidazolyl)>methoxymethane (101420-28-4) → bis(nitrito-O,O')[tris[2-(1-methyl)imidazolyl]methoxymethane]copper(II) (178316-11-5)

Conditions	Yield
In acetone addn. of 1 equiv. ligand and 2 equiv. KNO2 to Cu-salt, stirring for 30 min; filtration, crystn. on evapn., collection (filtration), drying in air;	82%

potassium nitrite (7758-09-0) + hydroxyammonium sulfate → nitrogen (7727-37-9) + dinitrogen monoxide (10024-97-2)

Conditions	Yield
In not given in acidic soln. from equimolar amounts of components; mole ratio N2O : N2 depends on the mole ratio of nitrite : hydrazonium salt;;	A 20% B 80%
In not given in acidic soln.; mole ratio N2O : N2 = 2:1 at mole ratio of nitrite : hydrazonium salt = 2:1;;

potassium nitrite (7758-09-0) + [Ru(CH3CN)2(CO)2(P(C6H5)3)2](2+)*2(PF6)(1-)=[Ru(CH3CN)2(CO)2(P(C6H5)3)2](PF6)2 → Ru(2+)*2NO2(1-)*2(CO)*2P(C6H5)3=[Ru(NO2)2(CO)2(P(C6H5)3)2]

Conditions	Yield
In methanol under N2 addn. of MeOH and KNO2 to complex, 50-60°C, 4 h, pptn.,evapn. in vac.; extn. with CH2Cl2, filtration, addn. of MeOH to ext., concn. in vac., recrystn. from CH2Cl2/MeOH, not sepn., detectation by IR, 31P NMR;	80%

potassium nitrite (7758-09-0) + [Ni(pentachlorophenyl)(pyridine)3]ClO4 (78331-77-8) → [Ni(NO2)(pentachlorophenyl)(pyridine)2]

Conditions	Yield
In acetone excess KNO2, stirring (6 h, pptn.); filtration, washing (water), recrystn. (CH2Cl2/MeOH); elem. anal.;	80%

N,N,N,N,N,N-hexamethylphosphoric triamide (680-31-9) + potassium nitrite (7758-09-0) + LaCl3*7.1H2O → La(3+)*3(NO2)(1-)*3(OP(N(CH3)2)3)= [La(NO2)3(OP(N(CH3)2)3)3]

Conditions

Yield

With triethyl formate In ethanol byproducts: KCl; LaCl3*7.1H2O in ethanol dehydrated by boiling with triethyl formate in presence OP(NMe2)3 for 15 min; filtering beaker with KNO2 mounted on backflow condenser, mixt. refluxed to complete dissoln. of KNO3; KCl filtered off; solvents distd. off in vac. at 300°K; filtered(acetone soln.), acetone distd. off in vac., crystd. after treatment with OP(NMe2)3 three times; washed (anhydrous diethyl ether), dried in vac.; elem. anal., XRD;

80%

potassium nitrite (7758-09-0) + dihydrogen hexachloroplatinate tetrahydrate + sodium nitrite (7632-00-0) → potassium tetranitroplatinate(IV)

Conditions	Yield
Stage #1: dihydrogen hexachloroplatinate tetrahydrate; sodium nitrite In water for 2h; Stage #2: potassium nitrite	80%

Upstream product

• 584-08-7 potassium carbonate 
• 7632-00-0 sodium nitrite 
• 1493-05-6 difluoro-nitro-methane 
• 865-47-4 potassium tert-butylate 
• 21109-95-5 barium sulfide 
• 7783-99-5 silver(I) nitrite 
• 7446-09-5 sulfur dioxide 
• 10102-43-9 nitrogen(II) oxide 
• 7440-09-7 potassium 
• 10024-97-2 dinitrogen monoxide 
• 10102-44-0 Nitrogen dioxide 
• 7439-92-1 lead 
• 7439-89-6 iron 
• 7440-74-6 indium 

Downstream Products

• 15421-15-5 potassium ascorbate 
• 1333-74-0 hydrogen 
• 10102-44-0 Nitrogen dioxide 
• 7732-18-5 water 
• 10102-43-9 nitrogen(II) oxide 
• 7697-37-2 nitric acid 
• 382165-80-2 N-nitrosodiphenylamine 
• 7727-37-9 nitrogen 
• 10024-97-2 dinitrogen monoxide 
• 13536-70-4 nitryl bromide 
• 7558-02-3 potassium bromide 
• 590-28-3 potassium cyanate 
• 7664-41-7 ammonia 
• 7440-09-7 potassium 

Relevant articles and documents

The thermal behavior of potassium dinitramide. Part 1. Thermal stability

In this paper, thermal analysis, X-ray photoelectric spectroscopy (XPS), etc. were used to investigate the thermal stability of potassium dinitramide (KDN). It was found that the thermal decomposition of KDN crystal conformed to the topochemistry. The dec

Biochemical characterization of molybdenum cofactor-free nitrate reductase from Neurospora crassa

Nitrate reductase (NR) is a complex molybdenum cofactor (Moco)-dependent homodimeric metalloenzyme that is vitally important for autotrophic organism as it catalyzes the first and rate-limiting step of nitrate assimilation. Beside Moco, eukaryotic NR also binds FAD and heme as additional redox active cofactors, and these are involved in electron transfer from NAD(P)H to the enzyme molybdenum center where reduction of nitrate to nitrite takes place. We report the first biochemical characterization of a Moco-free eukaryotic NR from the fungus Neurospora crassa, documenting that Moco is necessary and sufficient to induce dimer formation. The molybdenum center of NR reconstituted in vitro from apo-NR and Moco showed an EPR spectrum identical to holo-NR. Analysis of mutants unable to bind heme or FAD revealed that insertion of Moco into NR occurs independent from the insertion of any other NR redox cofactor. Furthermore, we showed that at least in vitro the active site formation of NR is an autonomous process.

Color Centers in UV-Irradiated Nitrates

We show that the peroxonitrite anion, ONOO(1-), is a primary product when solid nitrates are irradiated with 254-nm UV and is the source of the yellow color.Many previous investigators have attempted to interpret photolysis processes in crystalline nitrates as primarily involving nitrite anions and oxygen gas, not realizing that the nitrite and oxygen can be formed by decomposition of peroxonitrite when the solid is dissolved for analysis.A small amount of nitrite is formed in nitrate crystals directly from the nitrate ions but much of it is generated by photolysis of the peroxonitrite anion.

Dielectric study on ionic orientational disorder in the low-temperature phases of ionic plastic crystal KNO2

The complex dielectric permittivity of ionic plastic crystal KNO2 was measured in the frequency range 20-106 Hz and the temperature range 22-300 K. A small step-like anomaly of the static dielectric permittivity appeared at the rhombohedral (phase II) to monoclinic (phase III) transition (Ttr2 =264.1 K). In phase III, the static dielectric permittivity decreased gradually on cooling over a wide temperature range 50-264 K. These results indicate that the orientation of the NO2- ion is still disordered at high temperatures in phase HI and becomes ordered gradually with decreasing temperature. The dielectric dispersion associated with this motion occurred in the temperature range 70-150 K. From these data and the previously reported 15N NMR data, we propose a model of the motion of NO2- in phase III in which the anion undergoes 180°-flip motion about the axes perpendicular to the molecular C2 axis in an asymmetric double-minimum potential. WILEY-VCH Verlag GmbH, 1998.

Neutron powder diffraction study of the low-temperature phases of KNO2

We made neutron powder diffraction measurements for phase III (at 4, 120, 180, 220, and 250 K) and phase II (at 280 K) of KNO2. The structure of phase III was determined by the Rietveld method using the data obtained at 4 K; the initial structu

Chemical Effectiveness of Elastic and Inelastic Energy Loss of He+, Ar+, and Xe+ Ions Bombarding Solid Potassium Nitrate

Decomposition of crystalline potassium nitrate due to He+-, Ar+-, and Xe+-ion bombardment was studied in the energy range from 20 to 100 keV.The cross sections for producing nitrite ions were for the first time determined

Microemulstion synthesis of powders of water-soluble energy-saturated salts

The feasibility of preparing energy-saturated salts (NH4NO 3, KNO3, and NaBH4) in powders with various particle sizes in microemulsion systems based on oxyethylated surfactant Tergitol NP-4 has been demonstrated. Powders were isolated by destroying microemulsions with acetone. The regions of micellar synthesis have been determined depending on the solubilization capacities and concentrations of the reagents and salts at a fixed Tergitol NP-4 concentration (0.25 mol/L). The morphologies and particle sizes of the thus-prepared salt powders were characterized by scanning electron microscopy (SEM), X-ray powder diffraction, differential scanning calorimetry (DSC), differential thermal analysis (DTA), and thermogravimetry; the hydrodynamic radii of microemulsions were characterized by photon-correlation spectroscopy. Pleiades Publishing, Ltd., 2012.

Efficient electrochemical reduction of nitrate to nitrogen on tin cathode at very high cathodic potentials

The electrochemical reduction of nitrate on tin cathode at very high cathodic potentials was studied in 0.1 M K2SO4, 0.05 M KNO3 electrolyte. A high rate of nitrate reduction (0.206 mmol min-1 cm-2) and a high selectivity (%S) of nitrogen (92%) was obtained at -2.9 V versus Ag/AgCl. The main by-products were ammonia (8%) and nitrite (2O and traces of NO were also detected. As the cathodic potential increases, the %S of nitrogen increases, while that of ammonia displays a maximum at -2.2 V. The %S of nitrite decreases from 65% at -1.8 V to A cathodic corrosion of tin was observed, which was more intensive in the absence of nitrate. At potentials more negative than -2.4 V, small amounts of tin hydride were detected.

Palladium and platinum-based catalysts in the catalytic reduction of nitrate in water: Effect of copper, silver, or gold addition

Supported bimetallic palladium and platinum catalysts promoted by metals of group 11 (Cu, Ag, and Au) were prepared by control surface deposition and tested in the liquid-phase reduction of nitrates. Whereas bimetallic catalysts promoted by gold are totally inactive, copper or silver deposition leads to bimetallic catalysts active for nitrate reduction. The promoting effect of the second metal can be related to its redox properties, confirming that nitrate reduction occurs through a bifunctionnal mechanism following (i) a direct redox mechanism between promoter and nitrate and (ii) a catalytic reaction between hydrogen, chemisorbed on the noble metal, and intermediate nitrite. TEM experiments, TPR, and FTIR of chemisorbed CO studies of the different systems have been used to evidence the metal-metal interaction and the localization of the promoter. The characterization results have been correlated with the catalytic behavior of the materials.

The thermal behavior of potassium dinitramide: Part 2. Mechanism of thermal decomposition

In this paper, the thermal decomposition processes of KDN were investigated by means of thermal analysis and FT-IR with in situ cell. The results show that the decomposition of KDN in solid state is different from that of liquid state. The main condensed phase product of the decomposition in solid state is KNO3. While the decomposition of liquid state form KNO3 and KNO2 simultaneously. The possible mechanism of the thermal decomposition in solid state has been proposed. A eutectic can be formed by product KNO3 with KDN. The eutectic temperature of KNO3/KDN system is about 109°C. Moreover another eutectic system can be formed by KNO3 with KNO2 to be eutectic temperature of about 315°C.