6009-70-7

Basic information

• Product Name: Ammonium oxalate monohydrate
• Synonyms: AMMONIUM ETHANEDIOATE MONOHYDRATE;AMMONIUM OXALATE-1-HYDRATE;AMMONIUM OXALATE ACID;AMMONIUM OXALATE H2O;AMMONIUM OXALATE MONOHYDRATE;AMMONIUM BINOXALATE;AMMONIUM ACID OXALATE;ETHANEDIOIC ACID DIAMMONIUM SALT, MONOHYDRATE
• CAS NO: 6009-70-7
• Molecular Formula: C₂HO₄*H₂O*H₄N
• Molecular Weight: 142.11
• EINECS: 238-135-4
• Product Categories: Industrial/Fine Chemicals;Analytical reagent;others
• Mol File: 6009-70-7.mol
• Article Data: 2

Chemical Properties

• Melting Point: 133 °C (dec.)(lit.)
• Boiling Point: 259.65°C (rough estimate)
• Flash Point: 188.8 °C
• Appearance: White/Solid
• Density: 1.5
• Vapor Pressure: 2.51E-06mmHg at 25°C
• Refractive Index: 1.4500 (estimate)
• Storage Temp.: Store at RT.
• Solubility: H2O: 0.1 M at 20 °C, clear, colorless
• Water Solubility: 45 g/L (20 ºC)
• Stability: Stable. Incompatible with strong acids.
• Merck: 14,537
• BRN: 3759830
• CAS DataBase Reference: Ammonium oxalate monohydrate(CAS DataBase Reference)
• NIST Chemistry Reference: Ammonium oxalate monohydrate(6009-70-7)
• EPA Substance Registry System: Ammonium oxalate monohydrate(6009-70-7)

Safety Data

• Hazard Codes: Xn
• Statements: 21/22
• Safety Statements: 24/25
• RIDADR: UN 1759 8/PG 3
• WGK Germany: 1
• F: 21
• TSCA: Yes
• HazardClass: 6.1
• PackingGroup: III
• Hazardous Substances Data: 6009-70-7(Hazardous Substances Data)

Usage

Chemical Properties

Ammonium oxalate (NH4)2C204, is a white solid soluble, formed by reaction of NH40H and oxalic acid, and then evaporating. Used as a source of oxalate; ammonium binoxalate NH4HC204·H20.

Uses

Different sources of media describe the Uses of 6009-70-7 differently. You can refer to the following data:
1. Used for the detection of calcium, lead, fluoride and a buffering agent
2. Ammonium oxalate monohydrate can be used to study chelators, biological buffers and biochemicals and reagents. It has been used for the detection and determination of calcium, lead, fluoride, and rare earth metals. It is employed as chelators and forms complexes with metals. It acts as reducing agent in gold extraction and is an active ingredient of ferrous metal surface polishing fluid. It is a promoting agent in production of cobalt oxide and nickel oxide. It has been used in an analysis of the effective segregation coefficient keff of different impurities, which suggested that the dehydration energies of cations mainly determine the capability of capture of impurity species by the growing crystal. It is widely utilized as a buffering reagent and a dispersant to determine the surface interaction of platelets. Ammonium oxalate monohydrate is also a buffering reagent and a dispersant to determine the surface interaction of platelets and to investigate the formation of oxalate monoalkylamide in the human lens. Ammonium oxalate monohydrate has also been used to study its acute poisoning effect on sheep, and surely has many additional uses.
3. Ammonium oxalate monohydrate is widely utilized as a buffering reagent and a dispersant to determine the surface interaction of platelets. It finds an application to study its acute poisoning effect on sheep and to investigate the formation of oxalate monoalkylamide in the human lens. It is also used in the detection and determination of calcium, lead, fluoride and rare earth metals. It is employed as chelators and forms complexes with metals. It acts as reducing agent in gold extraction and is an active ingredient of ferrous metal surface polishing fluid. It is a promoting agent in production of cobalt oxide and nickel oxide.

General Description

Ammonium oxalate monohydrate is a diammonium salt of oxalic acid. Its refined crystal structure has been investigated by three-dimensional diffraction studies. Influence of bivalent [Mn(II), Co(II), Ni(II)] and trivalent cations [Fe(III), Cr(III)] impurities on the growth rates of ammonium oxalate monohydrate crystals has been described. Its space group and unit cell parameters have been analyzed by neutron diffraction studies. Its IR spectra have been compared with that of isolated coal-solubilizing agent (CSA).

Purification Methods

Crystallise it from water (10mL/g) at 50o. [Beilstein 2 IV 1846.]

InChI:InChI=1/C2H2O4.2H3N.H2O/c3-1(4)2(5)6;;;/h(H,3,4)(H,5,6);2*1H3;1H2

Synthetic route

oxaluric acid (585-05-7) → ammonium oxalate monohydrate (6009-70-7)

Conditions	Yield
With water

oxalic acid (144-62-7) + urea (57-13-6) → ammonium oxalate monohydrate (6009-70-7)

Conditions	Yield
With water

barium oxalate + (NH4)2 CO3 → ammonium oxalate monohydrate (6009-70-7)

Conditions	Yield
at 100℃;

ammonia (7664-41-7) + water (7732-18-5) + oxalic acid (144-62-7) → ammonium oxalate monohydrate (6009-70-7)

Conditions	Yield
In water soln. of ammonia and oxalic acid in H2O slowly evapd. at room temp. overabout 15-20 d;

ammonium carbonate + oxalic acid (144-62-7) → ammonium oxalate monohydrate (6009-70-7)

Conditions	Yield
In water neutralizing aq. oxalic acid soln. with (NH4)2CO3; evapn.;
In water neutralizing aq. oxalic acid soln. with (NH4)2CO3; evapn.;

hydrogen cyanide (74-90-8) → ammonium oxalate monohydrate (6009-70-7)

Conditions	Yield
With acetone In water mixt. of acetone and 3 % aq. HCN soln.; by light;
With acetone In water mixt. of acetone and 3 % aq. HCN soln.; by light;

ammonium sulfide (12135-76-1) + NH4(1+)*HC2O4(1-)*99H2O=(NH4)HC2O4*99H2O → NH4(1+)*3H(1+)*2C2O4(2-)*2H2O=(NH4)H3(C2O4)2*2H2O + ammonium oxalate monohydrate (6009-70-7)

Conditions	Yield
In water by standing of aq. soln. of educt;
In water by standing of aq. soln. of educt;

ammonia (7664-41-7) + oxalic acid (144-62-7) → ammonium oxalate monohydrate (6009-70-7)

Conditions	Yield
In water neutralizing aq. oxalic acid soln. with NH3; evapn.;
In water neutralizing aq. oxalic acid soln. with NH3; evapn.;

ammonium sulfide (12135-76-1) + lead(II) oxalate (69657-50-7) → ammonium oxalate monohydrate (6009-70-7)

Conditions	Yield
In water with freshly pptd. Pb oxalate;
In water with freshly pptd. Pb oxalate;

nickel(II) nitrate hexahydrate + water (7732-18-5) + ammonium oxalate monohydrate (6009-70-7) → nickel(II) oxalate dihydrate (20161-19-7, 34729-05-0)

Conditions	Yield
In water (NH4)2C2O4*H2O (48.87 g) added to 5.0 M Ni(NO3)2 (20 ml) (70-90°C); dispersed with deionized H2O; filtered; washed; dehydrated with anhyd. ethanol; dried (80-90°C); SEM;	99.76%

nickel(II) nitrate hexahydrate + water (7732-18-5) + ammonium oxalate monohydrate (6009-70-7) → nickel oxalate * 2.5 H2O

Conditions	Yield
In water Ni(NO3)2 soln. added to supersatd. (NH4)2C2O4; SEM;	97.98%

Ir(NH3)6(3+)*PO4(3-)*4H2O=Ir(NH3)6PO4*4H2O + ammonium oxalate monohydrate (6009-70-7) → 2Ir(NH3)6(3+)*3C2O4(2-)*4H2O=[Ir(NH3)6]2(C2O4)3*4H2O

Conditions	Yield
In water 2 equiv. of NH4-oxalate soln. was added to aq. soln. of metal-complex; crystals were filtered, washed with EtOH, Et2O, dried in vac., elem. anal.;	95%

bis[dichloro(pentamethylcyclopentadienyl)iridium(III)] (12354-84-6, 12354-85-7) + ammonium oxalate monohydrate (6009-70-7) → [Cp*2Ir2(μ-η4-C2O4)]Cl2 (280742-17-8)

Conditions	Yield
In methanol; chloroform under N2 atm. (NH4)2C2O4*H2O was added to suspn. Ir complex in CHCl3-MeOH and stirred at 55°C for 5 h; solvent was evapd. to dryness in vacuo, residue was extd. with CH2Cl2; elem. anal.;	91%
In methanol (N2); std. Schlenk technique; oxalate was added to suspn. of Ir complex in MeOH; stirred at 55°C for 5 h; evapd. (vac.); extd. (CH2Cl2); elem. anal.;	91%

[ruthenium(II)(η6-1-methyl-4-isopropyl-benzene)(chloride)(μ-chloride)]2 (52462-29-0) + ammonium oxalate monohydrate (6009-70-7) → [(p-cymene)2Ru2(μ-η4-C2O4)]Cl2 (201336-17-6, 1185317-98-9, 201425-24-3)

Conditions	Yield
In methanol; chloroform (N2); reflux (6 h); removal of solvents, taken up in CH2Cl2, filtration, evapn. to dryness; elem. anal.;	89%

dichloro(pentamethylcyclopentadienyl)rhodium (III) dimer + ammonium oxalate monohydrate (6009-70-7) → [(η5-pentamethylcyclopentadienyl)2Rh2(μ-oxalato-κO)Cl2] (958667-73-7)

Conditions	Yield
In methanol; chloroform byproducts: ammonium chloride; (NH4)2C2O4*H2O added to CHCl3-MeOH soln. of Rh complex; refluxed for 6 h; solvent removed under vac.; dissolved in CH2Cl2; filtered; filtrate evapd. to dryness; elem. anal.;	88%

aquo pentammine iridium(III) chloride + ammonium oxalate monohydrate (6009-70-7) → 2Ir(NH3)5(H2O)(3+)*3C2O4(2-)*4H2O=[Ir(NH3)5(H2O)]2(C2O4)3*4H2O

Conditions	Yield
In water satd. aq. soln. of NH4-oxalate was added to aq. soln. of metal-complex; crystals were filtered, washed with EtOH, Et2O, dried in vac., elem. anal.;	86%

dichloro(pentamethylcyclopentadienyl)rhodium (III) dimer + ammonium oxalate monohydrate (6009-70-7) → [Cp*2Rh2(μ-η2-η2-C2O4)]Cl2 (958667-73-7)

Conditions	Yield
In methanol; chloroform under N2 atm. (NH4)2C2O4*H2O was added to suspn. Rh complex in CHCl3-MeOH and stirred at 55°C for 5 h; solvent was evapd. to dryness in vacuo, residue was extd. with CH2Cl2; elem. anal.;	86%

[ruthenium(II)(η6-1-methyl-4-isopropyl-benzene)(chloride)(μ-chloride)]2 (52462-29-0) + ammonium oxalate monohydrate (6009-70-7) → C12H17NO4Ru*H2O, orthorhombic

Conditions	Yield
With AgSO4 In water (N2); addn. of AgSO4 to the Ru complex in H2O, stirring (room temp., 3 h), filtration, addn. of (NH4)2C2O4*H2O, adjustment ot pH to 7-8, heatingto 70°C (1-2 h); evapn. to dryness, addn. of CH2Cl2, filtration, evapn., recrystn. (MeOH/Et2O); elem. anal.;	84%

hexaammonium heptamolybdate tetrahydrate + dihydrogen peroxide (7722-84-1) + oxalic acid dihydrate (6153-56-6) + ammonium oxalate monohydrate (6009-70-7) → (NH4)2[MoO(O2)2(oxalate)]

Conditions	Yield
In water ammonium heptamolybdate tetrahydrate dissolved in soln. of oxalic acid and ammonium oxalate, treated with excess of soln. of H2O2 (35 wt,-%), stirred for 2 h; EtOH added, ppt. filtered off, washed with EtOH and air-dried; elem. anal.;	84%

bis[dichloro(pentamethylcyclopentadienyl)iridium(III)] (12354-84-6, 12354-85-7) + ammonium oxalate monohydrate (6009-70-7) → [(η5-C5Me5)IrCl(μ-η2-η2-oxalato)ClIr(η5-C5Me5)] (280742-17-8)

Conditions	Yield
In methanol; chloroform byproducts: ammonium chloride; (NH4)2C2O4*H2O added to CHCl3-MeOH soln. of Ir complex; refluxed for 6 h; solvent removed under vac.; dissolved in CH2Cl2; filtered; filtrate evapd. to dryness; elem. anal.;	81%

[Co(tris(2-aminoethyl)amine)Cl2]Cl (20023-19-2) + sodium perchlorate + ammonium oxalate monohydrate (6009-70-7) → [Co(C6H18N4)(oxalato)]ClO4*0.5H2O

Conditions	Yield
In water slow addition of soln. of oxalate to soln. of Co complex, heating (10 min), addn. of NaClO4; filtration, pptn. (2 weeks); elem. anal.;	77%

cis-dichlorobis(ethylenediamine)cobalt(III) chloride + water (7732-18-5) + ammonium oxalate monohydrate (6009-70-7) → cis-[Co(oxalate)(ethylenediamine)2]Cl*4H2O

Conditions	Yield
In water warm aq. soln. of (NH4)2ox (11 mmol) added to aq. soln. of Co compd. (10mmol) at 60°C, stirred for 30 min; pptd. on storage overnight, ppt. filtered off, washed (H2O, EtOH, ether), elem. anal.;	73%

copper(II) tetrafluoroborate tetrahydrate + N-(1H-pyrrol-2-ylmethylene)-2-(pyridin-2-yl)ethanamine (1093853-11-2) + ammonium oxalate monohydrate (6009-70-7) → [Cu2(N-(1H-pyrrol-2-ylmethylene)-2-pyridine-ethaneamine)2(oxalate)] (1190210-76-4)

Conditions	Yield
With Et3N In methanol; water MeOH soln. of Et3N (0.3 mmol) added to meOH soln. of ligand (0.3 mmol), soln. added to meOH soln. of Cu compd. (0.3 mmol), aq. ammonium oxalate (0.15 mmol) added, mixt. stirred for 6 h; ppt. filtered off, washed (MeOH), dried (vac.), elem. anal.;	71%

lanthanum(III) oxide + 5-hydroxynicotinic acid (27828-71-3) + water (7732-18-5) + ammonium oxalate monohydrate (6009-70-7) → [La(III)(3-H-5-phenoxonicotinato)(oxalate)(H2O)2]

Conditions	Yield
With Et3N In water High Pressure; mixt. of La2O3, (NH4)2C2O4*H2O, C6H5O3N and H2O in molar ratio of 1:1:1:290 adjusted to pH of 4.5 (Et3N) at room temp.; treated in autoclave at 170°C for 5 d; cooled to room temp. at a rate of 5°C/h; elem. anal., detd. by XRD;	68%

dysprosium((III) oxide + 5-hydroxynicotinic acid (27828-71-3) + water (7732-18-5) + ammonium oxalate monohydrate (6009-70-7) → [Dy(III)(3-H-5-phenoxonicotinato)(oxalate)1.5(H2O)]*H2O

Conditions	Yield
With Et3N In water High Pressure; mixt. of Dy2O3, (NH4)2C2O4*H2O, C6H5O3N and H2O in molar ratio of 1:1:1:290 adjusted to pH of 4.6 (Et3N) at room temp.; treated in autoclave at 180°C for 2 d; cooled to room temp. at a rate of 2°C/h; elem. anal., detd. by XRD;	67%

(((meso-tetra(4-pyridyl)porphyrin)(IrCl(C5(Me)5))4)2(CF3SO3)8 + ammonium oxalate monohydrate (6009-70-7) → (((meso-tetra(4-pyridyl)porphyrin)(Ir(C5(Me)5))4)2(μ-oxalato)4(CF3SO3)8

Conditions	Yield
In methanol under N2 atm.; (NH4)2C2O4*H2O added to soln. of Ir complex in MeOH, stirred at 55°C for 5 h;	65%

1h-benzotriazole-5-carboxylic acid (23814-12-2) + samarium(III) nitrate hexahydrate + ammonium oxalate monohydrate (6009-70-7) → [samarium(III)(benzotriazole-5-carboxylate)(oxalate)(H2O)2] monohydrate

Conditions	Yield
In water; acetonitrile at 140℃; for 72h; Autoclave;	56%

5-hydroxynicotinic acid (27828-71-3) + terbium(III) oxide + water (7732-18-5) + ammonium oxalate monohydrate (6009-70-7) → [Tb(III)(3-H-5-hydroxynicotinato)(oxalate)1.5(H2O)]*H2O

Conditions	Yield
With Et3N In water High Pressure; mixt. of Tb2O3, (NH4)2C2O4*H2O, C6H5O3N and H2O in molar ratio of 1:1.5:1:290 adjusted to pH of 4.0 (Et3N) at room temp.; treated in autoclave at 170°C for 3 d; cooled to room temp. at a rate of 2.5°C/h; elem. anal., detd. by XRD;	54%

samarium(III) oxide + 5-hydroxynicotinic acid (27828-71-3) + water (7732-18-5) + ammonium oxalate monohydrate (6009-70-7) → [Sm(III)(3-H-5-hydroxynicotinato)(oxalate)1.5(H2O)]*H2O

Conditions	Yield
With Et3N In water High Pressure; mixt. of Sm2O3, (NH4)2C2O4*H2O, C6H5O3N and H2O in molar ratio of 1:1.5:1:290 adjusted to pH of 4.0 (Et3N) at room temp.; treated in autoclave at 170°C for 3 d; cooled to room temp. at a rate of 2.5°C/h; elem. anal., detd. by XRD;	52%

1h-benzotriazole-5-carboxylic acid (23814-12-2) + holmium(III) nitrate hexahydrate + ammonium oxalate monohydrate (6009-70-7) → [holmium(III)(benzotriazole-5-carboxylate)(oxalate)(H2O)2] monohydrate

Conditions	Yield
In water; acetonitrile at 140℃; for 72h; Autoclave;	46%

5-hydroxynicotinic acid (27828-71-3) + praseodymium(III) oxide + water (7732-18-5) + ammonium oxalate monohydrate (6009-70-7) → [Pr(III)(3-H-5-phenoxonicotinato)(oxalate)(H2O)2]

Conditions	Yield
With Et3N In water High Pressure; mixt. of Pr2O3, (NH4)2C2O4*H2O, C6H5O3N and H2O in molar ratio of 1:1:1:290 adjusted to pH of 4.5 (Et3N) at room temp.; treated in autoclave at 170°C for 5 d; cooled to room temp. at a rate of 5°C/h; elem. anal., detd. by XRD;	42%

erbium(III) oxide + 5-hydroxynicotinic acid (27828-71-3) + water (7732-18-5) + ammonium oxalate monohydrate (6009-70-7) → [Er(III)(3-H-5-phenoxonicotinato)(oxalate)1.5(H2O)]*H2O

Conditions	Yield
With Et3N In water High Pressure; mixt. of Er2O3, (NH4)2C2O4*H2O, C6H5O3N and H2O in molar ratio of 1:1:1:290 adjusted to pH of 4.6 (Et3N) at room temp.; treated in autoclave at 180°C for 2 d; cooled to room temp. at a rate of 2°C/h; elem. anal., detd. by XRD;	41%

gadolinium(III) oxide + 5-hydroxynicotinic acid (27828-71-3) + water (7732-18-5) + ammonium oxalate monohydrate (6009-70-7) → [Gd(III)(3-H-5-hydroxynicotinato)(oxalate)1.5(H2O)]*H2O

Conditions	Yield
With Et3N In water High Pressure; mixt. of Gd2O3, (NH4)2C2O4*H2O, C6H5O3N and H2O in molar ratio of 1:1.5:1:290 adjusted to pH of 4.0 (Et3N) at room temp.; treated in autoclave at 170°C for 3 d; cooled to room temp. at a rate of 2.5°C/h; elem. anal., detd. by XRD;	41%

5-hydroxynicotinic acid (27828-71-3) + neodymium(III) oxide + water (7732-18-5) + ammonium oxalate monohydrate (6009-70-7) → [Nd(III)(3-H-5-phenoxonicotinato)(oxalate)(H2O)2]

Conditions	Yield
With Et3N In water High Pressure; mixt. of Nd2O3, (NH4)2C2O4*H2O, C6H5O3N and H2O in molar ratio of 1:1:1:290 adjusted to pH of 4.5 (Et3N) at room temp.; treated in autoclave at 170°C for 5 d; cooled to room temp. at a rate of 5°C/h; elem. anal., detd. by XRD;	41%

Pyridine-2,6-dicarboxylic acid (499-83-2) + erbium(III) nitrate hexahydrate + ammonium oxalate monohydrate (6009-70-7) → [Er4(2,6-pyridinedicarboxylate)2(μ4-oxalate)4(H2O)8](H2O)6

Conditions	Yield
With HNO3 In sodium hydroxide; water aq. NaOH; High Pressure; dicarboxylic acid and (NH4)2C2O4 (1:2) in aq.NaOH mixed with aq. soln. of Er salt (2 equiv.), pH adjusted to 5 (HNO3), stirred for 8 min (air), heated in an autoclave at 160°C for 72 h; cooled to room temp. over 12 h, elem. anal.;	36%

ammonium oxalate monohydrate (6009-70-7) + iron(III) chloride (7705-08-0) → ammonium trioxalatoferrate(III) trihydrate + ((NH4)2[Fe2O(ox)2Cl2]*2H2O)n

Conditions	Yield
In water (NH4)2C2O4*H2O was added to aq. soln. FeCl3, gently warmed for 10 min, soln. was allowed to stand at room temp. for several days; crystals were filtered and washed with EtOH and Et2O; elem. anal.;	A n/a B 30%

potassium permanganate (7722-64-7) + water (7732-18-5) + 1,2-diaminoethane dihydrochloride (333-18-6) + ammonium oxalate monohydrate (6009-70-7) + cobalt (7440-48-4) → [Co(III)(tris(((2-aminoethyl)amino)methyl)amine][Mn(C2O4)2]Cl*3H2O

Conditions	Yield
With CH3OH; air In methanol mixt. of Co powder, KMnO4, C2H4(NH2)2(HCl)2, (NH4)2C2O4*H2O and methanolheated at 50-60°C in air with stirring for 8 h; ppt. filtered off, washed with 2-propanol and dried under vac. at room temp.; recrystn. from H2O; elem. anal.;	30%

potassium permanganate (7722-64-7) + water (7732-18-5) + 1,2-diaminoethane dihydrochloride (333-18-6) + ammonium oxalate monohydrate (6009-70-7) + cobalt (7440-48-4) → [Co(III)(tris(1,2-diaminoethane)]2[Mn2(C2O4)5]*6H2O

Conditions	Yield
With CH3OH; air In N,N-dimethyl-formamide mixt. of Co powder, KMnO4, C2H4(NH2)2(HCl)2, (NH4)2C2O4*H2O and DMF/methanol (20/0.1) heated at 50-60°C in air with stirring for 8 h; ppt. filtered off, washed with 2-propanol and dried under vac. at room temp.; elem. anal.;	27%

hexaammonium heptamolybdate tetrahydrate + dihydrogen peroxide (7722-84-1) + oxalic acid dihydrate (6153-56-6) + ammonium oxalate monohydrate (6009-70-7) → (NH4)2[MoO2(O2)(oxalate)]*H2O + (NH4)2[Mo2O2(O2)2(OH)2(oxalate)2]

Conditions	Yield
In water ammonium heptamolybdate tetrahydrate dissolved in soln. of oxalic acid and ammonium oxalate, treated with soln. of H2O2 (35 wt.-%); EtOH added, stored at 5°C for 1 week, ppt. filtered off, washed with EtOH and air-dried ((NH4)2(MoO2(O2)(ox))*H2O), slow evapn. of filtrate yields (NH4)2(Mo2O2(O2)2(OH)2(ox)2); elem. anal.;	A 16% B n/a

Upstream product

• 585-05-7 oxaluric acid 
• 144-62-7 oxalic acid 
• 57-13-6 urea 
• 7664-41-7 ammonia 
• 7732-18-5 water 
• 74-90-8 hydrogen cyanide 
• 12135-76-1 ammonium sulfide 
• 69657-50-7 lead(II) oxalate 

Downstream Products

• 64-18-6 formic acid 
• 471-47-6 oxamic acid 
• 74-90-8 hydrogen cyanide 
• 124-38-9 carbon dioxide 
• 7664-41-7 ammonia 
• 7440-05-3 palladium 
• 6047-25-2 iron(II) oxalate dihydrate 
• 471-46-5 Oxalamide 
• 5972-72-5 ammonium oxalate 
• 516-00-7 ammmonium oxamate 
• 144-62-7 oxalic acid 
• 6160-36-7 strontium oxalate monohydrate 
• 640-67-5 manganese(II) oxalate 
• 14194-07-1 titanium oxalate 

Relevant articles and documents

EPR and optical study of Mn2+ doped ammonium oxalate monohydrate

Studies on fine and hyperfine structures of paramagnetic resonance spectra in single crystals of Mn2+: ammonium oxalate monohydrate are reported. As sufficient numbers of lines were not obtained at room temperature, measurements have been done at liquid nitrogen temperature and at the frequency of X-band. The Mn2+ spin Hamiltonian parameters have been evaluated employing a large number of resonant line positions observed for various orientations of the external magnetic field and the surrounding crystalline field has been discussed. The values of the zero field parameters that give good fit to the observed EPR spectra have been evaluated. The values obtained for g, A, B, D, E and a are 2.0002±0.0002, (100±2)×10 -4, (79.5±2)×10-4, (257±2)×10-4, (85±2)×10-4 and (-18±1)×10-4 cm-1, respectively. The percentage of covalency of the metal-ligand bond is also determined. The optical absorption study has been done at room temperature. The observed bands are assigned as transitions from the 6A1g(S) ground state to various excited quartet levels of Mn2+ ion in a cubic crystalline field. The electron repulsion parameters (B and C), the crystal field splitting parameter(Dq) and the Trees correction (α) providing good fit to the observed optical spectra have been estimated and the values obtained for the parameters are B=897, C=2144, Dq=910 and α=76 cm-1.