10544-73-7

Basic information

• Product Name: dinitrogen trioxide
• Synonyms: dinitrogen trioxide;NITROGENSESQUIOXIDE;Nitrogen trioxide: (Dinitrogen trioxide);1,3-Diaza-2,4,5-trioxabicyclo[1.1.1]pentane;Chebi:29799;o2Nno;Trioxido-1kappa(2)o,2kappao-dinitrogen(N--N)
• CAS NO: 10544-73-7
• Molecular Formula: N₂O₃
• Molecular Weight: 76.011
• EINECS: 234-128-5
• Mol File: 10544-73-7.mol
• Article Data: 14

Chemical Properties

• Melting Point: -103.15°C
• Boiling Point: 2°C (estimate)
• Flash Point: °C
• Appearance: /gas
• Density: 1.400
• Refractive Index: 1.531
• CAS DataBase Reference: dinitrogen trioxide(CAS DataBase Reference)
• NIST Chemistry Reference: dinitrogen trioxide(10544-73-7)
• EPA Substance Registry System: dinitrogen trioxide(10544-73-7)

Safety Data

• RIDADR: 2421
• HazardClass: 2.3
• Hazardous Substances Data: 10544-73-7(Hazardous Substances Data)

Usage

Chemical Properties

blue liquid; used as an oxidant in special fuel systems [HAW93]

General Description

A blue liquid with a sharp, unpleasant chemical odor. Density 1.447 g / cm3. Low-boiling (boiling point 3.5°C) and held as a liquid by compression. Partially dissociates into NO and NO2. Strong irritant to skin, eyes and mucous membranes. Vapors very toxic by inhalation. Used in special purpose fuels. Under prolonged exposure to intense heat the container may rupture violently and rocket.

Reactivity Profile

dinitrogen trioxide is an oxidizing agent. Nonflammable but may cause fires when mixed with combustible materials. Reacts with reducing agents to generate heat and products that may be gaseous (causing pressurization of closed containers). The products may themselves be capable of further reactions (such as combustion in the air). Catalyzes ignition of phosphine gas [Edin. Roy. Soc. 13:88. 1935]. A mixture with caprolactam dissolved in acetic acid is explosive unless effectively cooled. Incompatible with phosphorus, or other reduced materials Reactivity likely to resemble that of nitrogen dioxide and nitrogen tetraoxide.. .

Health Hazard

TOXIC; may be fatal if inhaled or absorbed through skin. Fire will produce irritating, corrosive and/or toxic gases. Contact with gas or liquefied gas may cause burns, severe injury and/or frostbite. Runoff from fire control may cause pollution.

Fire Hazard

Substance does not burn but will support combustion. Vapors from liquefied gas are initially heavier than air and spread along ground. These are strong oxidizers and will react vigorously or explosively with many materials including fuels. May ignite combustibles (wood, paper, oil, clothing, etc.). Some will react violently with air, moist air and/or water. Cylinders exposed to fire may vent and release toxic and/or corrosive gas through pressure relief devices. Containers may explode when heated. Ruptured cylinders may rocket.

InChI:InChI=1/N2O3/c3-1-2(4)5

Synthetic route

nitrogen(II) oxide (10102-43-9) + dinitrogen tetraoxide (10544-72-6) → dinitrogen trioxide (10544-73-7)

Conditions	Yield
In toluene -20°C,for 2h;	94.4%
In toluene -20°C,for 2h;	94.4%
-20°C, absorption of NO;

dinitrogen tetraoxide (10544-72-6) + phosphorus trichloride (7719-12-2, 52843-90-0) → dinitrogen trioxide (10544-73-7) + P4O4Cl10 + pyrophosphoryl chloride (13498-14-1) + nitrogen(II) oxide (10102-43-9) + trichlorophosphate (10025-87-3, 12599-09-6, 63736-95-8)

Conditions	Yield
In neat (no solvent) byproducts: NOCl, NO2Cl; Irradiation (UV/VIS); passing dry N2O4 over the surface of freshly distd. PCl3 cooled at -40 °C and under irradiation with UV light; absortion under formation of a dark red liq.; expelling NO, N2O3, NOCl, NO2Cl;; isolation of liquid products by fractionation; liquid phase containing POCl3, P2O3Cl4 and P4O4Cl10; yield of P2O3Cl4 25 %, P4O4Cl10 3 %;;	A n/a B 3% C 25% D n/a E n/a
In neat (no solvent) byproducts: NOCl, NO2Cl; passing dry N2O4 over the surface of freshly distd. PCl3 cooled at -40 °C; absortion under formation of a dark red liq.; expelling NO, N2O3, NOCl, NO2Cl; liquid phase contg. POCl3, P2O3Cl4 and a small amount of P4O4Cl10;; isolation of liquid products by fractionation; yield of P2O3Cl4 5 %, P4O4Cl10 10 %;;	A n/a B 10% C 5% D n/a E n/a

dinitrogen tetraoxide (10544-72-6) + phosphorus trichloride (7719-12-2, 52843-90-0) → dinitrogen trioxide (10544-73-7) + P4O4Cl10 + P2O6NCl2 + pyrophosphoryl chloride (13498-14-1) + trichlorophosphate (10025-87-3, 12599-09-6, 63736-95-8)

Conditions	Yield
In neat (no solvent) byproducts: NOCl, NO2Cl, NO; passing dry N2O4 over the surface of freshly distd. PCl3 cooled at -10 °C; absortion under formation of a dark red liq.; expelling NO, N2O3, NOCl, NO2Cl and pptn. of P2O6NCl2; liquid phase contg. POCl3, P2O3Cl4 and a small amount of P4O4Cl10;; isolation of liquid products by fractionation; yield of P2O3Cl4 17 % and of P4O4Cl10 5 %;;	A n/a B 5% C n/a D 17% E n/a

sodium azide + NOSO2OH → hydrogen azide + dinitrogen trioxide (10544-73-7) + nitrosyl azide (62316-46-5) + Nitrogen dioxide (10102-44-0) + dinitrogen monoxide (10024-97-2)

Conditions	Yield
With sulfuric acid byproducts: N2; addition of NOSO2OH in concd. H2SO4 at -195.8°C, next handle from -30 to -35°C for 8-24 h;	A n/a B n/a C 6% D n/a E n/a
With H2SO4 byproducts: N2; addition of NOSO2OH in concd. H2SO4 at -195.8°C, next handle from -30 to -35°C for 8-24 h;	A n/a B n/a C 6% D n/a E n/a

sodium azide + nitric acid (7697-37-2) → hydrogen azide + dinitrogen trioxide (10544-73-7) + nitrosyl azide (62316-46-5) + Nitrogen dioxide (10102-44-0) + dinitrogen monoxide (10024-97-2)

Conditions	Yield
With sulfuric acid byproducts: N2; addition of 1:1 mixture of HNO3 - H2SO4 at -195.8°C, next handle from -30 to -35°C for 8-24 h;	A n/a B n/a C 5% D n/a E n/a
With H2SO4 byproducts: N2; addition of 1:1 mixture of HNO3 - H2SO4 at -195.8°C, next handle from -30 to -35°C for 8-24 h;	A n/a B n/a C 5% D n/a E n/a
byproducts: N2; 70% HNO3 addition at -195.8°C, next handle from -30 to -35°C for 8-24 h;	A n/a B n/a C 4% D n/a E n/a

phosphorous acid (10294-56-1) → dinitrogen trioxide (10544-73-7) + phosphoric acid (86119-84-8, 7664-38-2)

Conditions	Yield
With oxygen; nitric acid byproducts: H2O; at 90°C 45 min with 2-fold excess of 30% HNO3;	A n/a B 5%
With oxygen; nitric acid byproducts: H2O; at 90°C 45 min with 2-fold excess of 55% HNO3;

hypophosphorous acid (6303-21-5) → dinitrogen trioxide (10544-73-7) + phosphoric acid (86119-84-8, 7664-38-2)

Conditions	Yield
With oxygen; nitric acid byproducts: H2O; at 90°C 45 min with 2-fold excess of 30% HNO3;	A n/a B 5%
With oxygen; nitric acid byproducts: H2O; at 90°C 45 min with 2-fold excess of 55% HNO3;

nitrogen(II) oxide (10102-43-9) + ozone (10028-15-6) → N-oxo-N-nitrosoamine (16824-89-8, 12533-50-5) + peroxo nitrate radical (126588-37-2) + dinitrogen trioxide (10544-73-7) + nitrous anhydride (122413-35-8) + Nitrogen dioxide (10102-44-0)

Conditions	Yield
In gaseous matrix Kinetics; in gas phase (Ar); further product: N2O4; 0.5-1 h deposition on 10 K CsI window; characterized IR spect.;

Nitrogen dioxide (10102-44-0) + ozone (10028-15-6) → dinitrogen tetroxide (15969-55-8) + dinitrogen trioxide (10544-73-7) + dinitrogen tetraoxide (10544-72-6) + dinitrogen pentoxide (10102-03-1)

Conditions	Yield
In gaseous matrix gas-phase react. of NO2/ Ar deposited on a cold CsI window with O3/ Ar (deposition rates of O3: 0.09 to less than 0.27 mmol/ h); not isolated, detected by IR spectroscopy;;

sodium silicate + nitrosylchloride (2696-92-6) → dinitrogen trioxide (10544-73-7) + sodium chloride (7647-14-5)

Conditions	Yield
In neat (no solvent) byproducts: SiO2;
In neat (no solvent) byproducts: SiO2;

calcium oxide → dinitrogen trioxide (10544-73-7) + calcium(II) nitrate (13477-34-4)

Conditions	Yield
With nitrogen oxides; Fe(OH)3 or Al(OH)3 or Cr(OH)3 In water absorption of nitrogen oxides in suspensions of heavy metal hydroxides and with CaO; then interaction of the intermediately formed nitrates;;
With nitrogen oxides In water absorption of nitrogen oxides in suspensions of heavy metal hydroxides and with CaO; then interaction of the intermediately formed nitrates;;

sulfur dioxide (7446-09-5) + dinitrogen tetraoxide (10544-72-6) → dinitrogen trioxide (10544-73-7) + sulfur trioxide (7446-11-9)

Conditions	Yield
In liquid sulphur dioxide dry conditions;

nitrogen (7727-37-9) + oxygen (80937-33-3) → dinitrogen trioxide (10544-73-7) + nitrogen(II) oxide (10102-43-9) + Nitrogen dioxide (10102-44-0)

Conditions	Yield
other Radiation; in a 2.45 GHz microwave-sustained discharge at 1-10 Torr; products condensed at 77 K, analysis by MS and emission spectra;

nitric acid (7697-37-2) → dinitrogen trioxide (10544-73-7) + nitrogen(II) oxide (10102-43-9) + cis-nitrous acid (7782-77-6) + Nitrogen dioxide (10102-44-0) + trans-hyponitrous acid (19467-31-3, 173728-04-6)

Conditions	Yield
With sodium byproducts: N2O, N2, NH3; decompn. of HNO3 with Na in presence of H2O; further decompn.-product: H2;;

nitric acid (7697-37-2) → dinitrogen trioxide (10544-73-7) + nitrogen(II) oxide (10102-43-9) + Nitrogen dioxide (10102-44-0)

Conditions	Yield
In not given from HNO3 soln. of density 1.4;

nitric acid (7697-37-2) → dinitrogen trioxide (10544-73-7) + Nitrogen dioxide (10102-44-0) + dinitrogen monoxide (10024-97-2)

Conditions	Yield
With sulfur dioxide In not given various products for various HNO3 concn.;
With SO2 In not given various products for various HNO3 concn.;

nitric acid (7697-37-2) + arsenic(III) trioxide → dinitrogen trioxide (10544-73-7) + nitrogen(II) oxide (10102-43-9) + dinitrogen tetraoxide (10544-72-6)

Conditions	Yield
various prods. for various concn. of HNO3;
various prods. for various concn. of HNO3;

nitrogen(II) oxide (10102-43-9) + nitric acid (7697-37-2) → dinitrogen trioxide (10544-73-7) + cis-nitrous acid (7782-77-6)

Conditions	Yield
in dild. HNO3;
in dild. HNO3;

nitrogen + nitrogen(II) oxide (10102-43-9) → dinitrogen trioxide (10544-73-7) + nitrogen (7727-37-9)

Conditions	Yield
with N - N2 (both metastable) mixture marked as "active nitrogen";
with N - N2 (both metastable) mixture marked as "active nitrogen";

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) → dinitrogen trioxide (10544-73-7) + copper(II) nitrate

Conditions	Yield
With nitric acid byproducts: H2O; 5-6n HNO3;
With HNO3 byproducts: H2O; 5-6n HNO3;

dinitrogen tetraoxide (10544-72-6) + 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) → dinitrogen trioxide (10544-73-7) + copper(II) nitrate

Conditions	Yield
In sulfolane byproducts: NO; React. of Cu powder with excess of N2O4 in sulfolane.; Distn. of NO, N2O3 and of excess N2O4 in vac.;

mercury + sodium nitrite (7632-00-0) → dinitrogen trioxide (10544-73-7) + nitrogen(II) oxide (10102-43-9)

Conditions	Yield
With sulfuric acid with lead chamber crystals;	A <1 B n/a
With sulfuric acid In not given concd. H2SO4; washing with KOH soln.;	A <1 B n/a

antimony (7440-36-0) → antimony(III) trioxide + dinitrogen trioxide (10544-73-7) + silver (7440-22-4)

Conditions	Yield
With silver nitrate In not given adding Sb to the cold concd. AgNO3 soln.; with excess of AgNO3 Ag formed in a violent reaction;
In not given

dinitrogen tetraoxide (10544-72-6) + zinc (7440-66-6) → zinc(II) nitrate (10196-18-6) + dinitrogen trioxide (10544-73-7)

Conditions	Yield
In sulfolane byproducts: NO; React. of Zn powder with excess of N2O4 in sulfolane.; Distn. of NO, N2O3 and of excess N2O4 in vac.;

nitrosylsulfuric acid + potassium nitrate → potassium hydrogensulfate (7646-93-7) + dinitrogen trioxide (10544-73-7) + Nitrogen dioxide (10102-44-0)

Conditions	Yield
condensation,distn.;

dinitrogen tetraoxide (10544-72-6) + phosphorus trichloride (7719-12-2, 52843-90-0) → dinitrogen trioxide (10544-73-7) + P2O6NCl2 + pyrophosphoryl chloride (13498-14-1) + nitrogen(II) oxide (10102-43-9) + trichlorophosphate (10025-87-3, 12599-09-6, 63736-95-8)

Conditions

Yield

In neat (no solvent) byproducts: NOCl, NO2Cl, P4O4Cl10; passing dry N2O4 over the surface of freshly distd. PCl3 cooled at -10 °C; absortion under formation of a dark red liq.; expelling NO, N2O3, NOCl, NO2Cl and pptn. of P2O6NCl2; liquid phase contg. POCl3, P2O3Cl4 and a small amount of P4O4Cl10;; isolation of liquid products by fractionation; mechanism described; formation of a small amount of PCl5 by react. of NOCl with PCl3 in the gaseous phase;;

sodium nitrite (7632-00-0) → sodium nitrate (7631-99-4) + dinitrogen trioxide (10544-73-7) + nitrogen (7727-37-9) + nitrogen(II) oxide (10102-43-9)

Conditions	Yield
decompn. at 330-380°C in CO2-atm.;
decompn. at 330-380°C in CO2-atm.;

sodium nitrite (7632-00-0) → sodium oxide + sodium nitrate (7631-99-4) + dinitrogen trioxide (10544-73-7) + nitrogen (7727-37-9) + nitrogen(II) oxide (10102-43-9)

Conditions	Yield
decompn. at 380°C in closed vessel;
decompn. at 380°C in closed vessel;

sodium nitrite (7632-00-0) → dinitrogen trioxide (10544-73-7)

Conditions	Yield
decompn. at 330-380°C in N2-atm.;
With sulfuric acid In not given Na salt stirred for ca. 1 h in CH2Cl2 or 1,2 dichloroethane, cooled to 0°C, added dropwise to a aq. sulfuric acid; org. layer separated, dried (Na2SO4, mol. sieve);
With sulfuric acid In water with concd.H2SO4;
With H2SO4 In water with concd.H2SO4;
decompn. at 330-380°C in N2-atm.;

ammonium nitrate → dinitrogen trioxide (10544-73-7) + water (7732-18-5) + nitrogen(II) oxide (10102-43-9) + Nitrogen dioxide (10102-44-0)

Conditions	Yield
byproducts: N2, HNO31; detonation by strong initial ignition;

dinitrogen trioxide (10544-73-7) + sulfuric acid (7664-93-9) → nitrosylsulfuric acid (7782-78-7)

Conditions	Yield
In acetonitrile	78%

bis(triphenylphosphine)iridium(I) carbonyl chloride (15318-31-7, 14871-41-1, 59246-46-7) + dinitrogen trioxide (10544-73-7) → carbonylchloronitrosylnitrobis(triphenylphosphine)iridium(III)

Conditions	Yield
In dichloromethane under Ar; N2O3 was passed into a soln. of complex in CH2Cl2 for 30 min; soln. was concd., hot EtOH was added, crystals were centrifuged, washedwith EtOH, ether, dried in vac.; elem. anal.;	75%

dinitrogen trioxide (10544-73-7) + Ir(1+)*CO*SO2*Cl(1-)*2P(C6H5)3=Ir(CO)(SO2)Cl(P(C6H5)3)2 → carbonylchloronitronitratobis(triphenylphosphine)iridium(III)

Conditions	Yield
With oxygen In dichloromethane under Ar; N2O3 was passed into a soln. of the Ir complex in CH2Cl2 for 30 min in the presence of O2; soln. was concd., hot EtOH was added, crystals were centrifuged, washedwith EtOH, ether, dried in vac.; elem. anal.;	70%

dinitrogen trioxide (10544-73-7) + Ir(CO)(H2S)Cl(P(C6H5)3)2 (77340-37-5) → carbonylchloronitronitratobis(triphenylphosphine)iridium(III)

Conditions	Yield
With oxygen In dichloromethane under Ar; N2O3 was passed into a soln. of the Ir complex in CH2Cl2 for 30 min in the presence of O2; soln. was concd., hot EtOH was added, crystals were centrifuged, washedwith EtOH, ether, dried in vac.; elem. anal.;	68%

bis(triphenylphosphine)iridium(I) carbonyl chloride (15318-31-7, 14871-41-1, 59246-46-7) + dinitrogen trioxide (10544-73-7) → carbonylchloronitronitratobis(triphenylphosphine)iridium(III)

Conditions	Yield
With oxygen In dichloromethane under Ar; O2 was passed into a soln. of the Ir complex in CH2Cl2 for 30min, then N2O3 for 30 min; soln. was concd., hot EtOH was added, crystals were centrifuged, washedwith EtOH, ether, dried in vac.; elem. anal.;	62%

dinitrogen trioxide (10544-73-7) + triphenylbismuthane (603-33-8) → benzenediazonium nitrate

Conditions	Yield
With nitrogen(II) oxide molar ratio Bi(C6H5)3:N2O3:NO =1:1:1;	54%

dinitrogen trioxide (10544-73-7) + carbonylhydridotris(triphenylphosphine)iridium(I) (33541-67-2) → hydridocarbonylnitrosylnitro(triphenylphosphine)iridium(III)

Conditions	Yield
In dichloromethane byproducts: PPh3; under Ar; N2O3 was passed into a soln. of the Ir complex in CH2Cl2 for 30 min; soln. was concd., hot EtOH was added, crystals were centrifuged, washedwith EtOH, ether, dried in vac., recrystd. from CH2Cl2-MeOH; elem. anal.;	40%

dinitrogen trioxide (10544-73-7) + triphenylbismuthane (603-33-8) → bismuth(III) nitrate + benzenediazonium nitrate

Conditions	Yield
	A n/a B 10%

di(rhodium)tetracarbonyl dichloride + dinitrogen trioxide (10544-73-7) + cyclopentadienylthallium(I) → (C5H5)2Rh2(NO)2 (67426-08-8) + (C5H5)3Rh3(NO)2 (75495-01-1)

Conditions	Yield
In tetrahydrofuran in N2 atm. nitric oxide bubbled through soln. (Rh(CO)2Cl)2 in THF for 20 h, CpTl added and stirred for 14 h; soln. filtered, filtrate evapd. and purified by chromy. (silica gel/benzene) - Cp2Rh2(NO)2; solid extd. with CH2Cl2, soln. reduced in volume and placed in freezer at -15°C, ppt. filtered - Cp3Rh3(NO)2; elem. anal.;	A 9% B n/a
In tetrahydrofuran in N2 atm. nitric oxide bubbled through soln. (Rh(CO)2Cl)2 in THF for 24 h, CpTl added and stirred for 14 h; soln. filtered, filtrate evapd. and purified by chromy. (silica gel/benzene) - Cp2Rh2(NO)2; solid extd. with CH2Cl2, soln. reduced in volume and placed in freezer at -15°C, ppt. filtered - Cp3Rh3(NO)2; elem. anal.;	A n/a B 9%
In tetrahydrofuran in N2 atm. nitric oxide bubbled through soln. (Rh(CO)2Cl)2 in THF for 2.5 h, CpTl added and stirred for 14 h; soln. filtered, filtrate evapd. and purified by chromy. (silica gel/benzene) - Cp2Rh2(NO)2; solid extd. with CH2Cl2, soln. reduced in volume and placed in freezer at -15°C, ppt. filtered - Cp3Rh3(NO)2; elem. anal.;	A 7.3% B 3%

dinitrogen trioxide (10544-73-7) + dicarbonyl(cyclopentadienyl)rhodium → (C5H5)2Rh2(NO)2 (67426-08-8) + (C5H5)2Rh2(NO)(NO2) (75365-54-7) + (C5H5)3Rh3(NO)2 (75495-01-1) + Rh3(3+)*3C5H5(1-)*3CO=(C5H5)3Rh3(CO)3 (12148-54-8)

Conditions	Yield
With air In dichloromethane nitric oxide bubbled through soln. CpRh(CO)2 in dichloromethane for several hours, air injected; solvent removed under reduced pressure and residue separated by TLC (pentane/dichloromethane);	A 7% B 1% C n/a D n/a

ammonium bisulfite + dinitrogen trioxide (10544-73-7) → nitrogen (7727-37-9) + sulfur dioxide (7446-09-5) + water (7732-18-5)

Conditions	Yield
Kinetics; Denitration of N2O3 in reactor fitted with a stirrer (423 K, 30 min).; Chronopotentiometric titration.;

ammonium bisulfite + dinitrogen trioxide (10544-73-7) → sulfuric acid (7664-93-9) + nitrogen (7727-37-9) + water (7732-18-5)

Conditions	Yield
Kinetics; Denitration of N2O3 in reactor fitted with a stirrer (423 K, 30 min).; Chronopotentiometric titration.;

dinitrogen trioxide (10544-73-7) + sodium chloride (7647-14-5) → sodium nitrate (7631-99-4)

Conditions	Yield
In neat (no solvent) byproducts: NOCl; treatment of solid NaCl with NO2;; dissolving NaNO3 in liquid NH3, separation from unreacted chloride;;

dinitrogen trioxide (10544-73-7) + copper(II) oxide → Cu(1+)*NO3(1-)*NO2=CuNO3*NO2

Conditions	Yield
In neat (no solvent)
In neat (no solvent) treatmnet of CuO (prepared at temperatures lower than 120°C) with liquid N2O3;;

dinitrogen trioxide (10544-73-7) + lead(II) oxide → lead(II) nitrate

Conditions	Yield
In neat (no solvent) below 120°C;;

dinitrogen trioxide (10544-73-7) + sulfur trioxide (7446-11-9) → S2O7(2-)*2NO(1+)=S2O7(NO)2

Conditions	Yield
In gas 19 °C, above oleum;

dinitrogen trioxide (10544-73-7) + sulfur trioxide (7446-11-9) → NO2(1+)*NO3(1-)*3SO3=N2O5*3SO3

Conditions	Yield
In trichlorophosphate 3% N2O3;

dinitrogen trioxide (10544-73-7) + sulfur trioxide (7446-11-9) → N2O3*3SO3

Conditions	Yield
room temp.;
In liquid sulphur dioxide -20 °C, exclusion of moisture;

Upstream product

• 2696-92-6 nitrosylchloride 
• 7446-09-5 sulfur dioxide 
• 10544-72-6 dinitrogen tetraoxide 
• 7632-00-0 sodium nitrite 
• 7440-66-6 zinc 
• 10294-56-1 phosphorous acid 
• 7719-12-2 phosphorus trichloride 
• 12029-98-0 iodine pentoxide 
• 10102-43-9 nitrogen(II) oxide 
• 7440-22-4 silver 
• 10102-44-0 Nitrogen dioxide 
• 7782-49-2 selenium 
• 7789-25-5 nitrosyl fluoride 
• 112926-00-8 silica gel 

Downstream Products

• 7727-37-9 nitrogen 
• 7446-09-5 sulfur dioxide 
• 7732-18-5 water 
• 7664-93-9 sulfuric acid 
• 7631-99-4 sodium nitrate 
• 16921-91-8 nitrosyl hexafluorophosphate 
• 87-39-8 violuric acid 
• 13446-18-9 magnesium(II) nitrate 
• 13446-48-5 ammonium nitrite 
• 7783-61-1 silicon tetrafluoride 
• 41886-31-1 diisonitroso acetone 
• 55-68-5 phenylmercury(II) nitrate 
• 619-97-6 benzenediazonium nitrate 
• 100-02-7 4-nitro-phenol 

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Ab initio study on the structure and vibrational spectra of dinitrogen trioxide (cas 10544-73-7) and its isomers08/06/2019

Equilibrium geometries, dipole moments, harmonic vibrational frequencies, and IR intensities have been calculated for a set of dinitrogen trioxide conformers by ab initio calculations at the MP2 level with the 6-31G∗ and 6-311G∗ basis sets. The calculation results satisfactorily reproduce the ex...detailed

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Nitrogen Quadrupole Coupling Measurements on ON-NO2 Using the Flygare-Balle Pulsed-Beam Spectrometer

High-resolution measurements of the 101 00, 212 11, 202 01, 211 0, 312 13, and 413 14 transitions in the ON-NO2 complex were made by using a pulsed-beam, Fourier transform microwave spectrometer.Nearly all hyperfine structure components were resolved on observed transitions except for the 202 01 group.The quadrupole coupling tensors in the principal axis system were determined for both nitrogen atoms.The nitrogen quadrupole coupling components for the NO group are eQqaa = -1.7766 +/- 0.0037 MHz and eQqbb = 0.0585 +/- 0.0021 MHz.For the NO2 group eQqaa = -0.5260 +/- 0.0035 MHz and eQqbb = -4.1941 +/- 0.0018 MHz.The rotational constants obtained are A = 12412 +/- 22 MHz, B = 4226.530 +/- 0.012 MHz, and C = 3152.966 +/- 0.012 MHz.Rotational transition frequencies and estimates of spin-rotation interaction strengths are given.The observed quadrupole coupling strengths are substantially different from those observed for the free NO and NO2 molecules.

Isolable Adducts of Tertiary Amines and Dinitrogen Trioxide

Anhydrous dinitrogen trioxide, N2O3, dissolved in toluene or dichloromethane rapidly forms stable adducts with tertiary amines such triethyl-, tribenzyl-, or trihexyl-amine. With DABCO, 1,4-diazabicyclo[2.2.2]octane it forms a free flowing orange solid. The analytical and spectroscopic data for the DABCO adduct indicate a formula of DABCO(N2O3)2 which has been characterized by IR, Raman, and UV/Vis spectroscopy. The R3N-N2O3 adducts are hydrolytically sensitive oils or solids which rapidly react quantitatively with thiols to give RSNO. The reactivity of the amine adducts is variable, and the products include amine N-oxides, ammonium nitrites, and ammonium nitrates depending upon the adduct, conditions, and substrate. Density functional theory, B3LYP/aug-cc-pvtz, has been used to compare the predicted structures and spectroscopic data for mono and bis adducts. Geometry optimization of the R3N N2O3 adduct gives a weakly bound Lewis acid/base adduct with the amine nitrogen closest to the nitrosyl N with a strongly tilted planar ONNO2 unit.

DeNOx of exhaust gas from lean-burn engines through reversible adsorption of N2O3 in alkali metal cation exchanged faujasite-type zeolites

NO and NO2 associated as the asymmetric N2O3 conformer compete with water molecules for coordination with sodium cations of the sodium-water clusters in supercages of the Na-Y zeolite. This reactive NO(x) adsorption is rev