The absorption spectra of complex oxalates

Graddon, DP

doi:10.1016/0022-1902(56)80041-9

Cited by 34 publications

(11 citation statements)

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“…Recently Thode (20) summarized the carbonate ion anomaly in sea water and Garrels, Thompson, and Siever (21) calculated that of the total CO3= in sea water nearly 75% is present as a neutral complex, i\?gC030. ib1agnesiu111 is known t o exhibit hexa-coordination, for example, in Mg(Hz0)62f (22) and M~( C~O , ) Z ( H~O )~~- (23). A reasonable structure for the neutral complex of rnagnesiuln and carbonate in solution is although some type of protonated carbonato complex might alter the bidentate character of the carbonate ligand.…”

Section: Eject Of Cationsmentioning

confidence: 99%

Carbon-13 Isotope Effects in Systems Containing Carbon Dioxide, Bicarbonate, Carbonate, and Metal Ions

Thode¹,

Shima²,

Rees³

et al. 1965

Can. J. Chem.

111

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The fractionation of ' 3C between CO?(g) and COs'--HCOs-(aq) in solution has been studied in single stage experiments using carbonic anhydrase to catalyze the hydration of CO?. Added metal ions, pH of the equilibrium mixture, and temperature are found to play important roles in the overall fractionation process. Theoretical evaluation of the 13CO?(g)--12C03=(aq) equilibrium constant (K?) has been made using the most recent spectroscopic data on the exchanging species. The variation of the equilibrium constant K? with temperature has been calculated for each 25 deg interval from 0 to 975 OC with the help of the MclMaster University I B M 7040 computer.

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Section: Eject Of Cationsmentioning

confidence: 99%

Carbon-13 Isotope Effects in Systems Containing Carbon Dioxide, Bicarbonate, Carbonate, and Metal Ions

Thode¹,

Shima²,

Rees³

et al. 1965

Can. J. Chem.

111

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“…The k max of m 3 transition is not decisive as it overlaps with the p-p* transition of the oxalate ligand which occurs at ca. 300 nm [9]. The solid state diffused reflectance spectra (Fig.…”

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confidence: 99%

The alexandrite-like Cr-doped aluminum oxalato complexes

Chaiyapoom

Wongnawa

Pakawatchai

et al. 2006

Inorganic Chemistry Communications

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“…spectrum of the compound preheated to 270 ~ indicated the presence of trace amounts of water. The presence of the peaks indicated that the chelating character of the oxalato group was retained [17]. The faint green compound so produced absorbed moisture immediately [7,9] on exposure to humid atmosphere resulting in the reformation of the original compound as evidenced by the reappearance of the broad band in the region of 3700-3000 em -1.…”

Section: Resultsmentioning

confidence: 99%

“…The value derived from DSC data (5 deg rain -1) was 142.26 kJ mo1-1. The enthalpy change was (AH) 17.99xi04 Id tool -1.…”

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confidence: 99%

Thermal decompostion studies on nickel(II) bis(oxalato)nickelate(II) pentahydrate

Deb

Gogoi

Dass

1990

Journal of Thermal Analysis

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The paper describes the synthesis and thermal decomposition of nickel(II)bis(oxalato)nickelate(II)pentahydrate, Ni[Ni(C204)z].5H20. The complex was characterized by elemental analysis, infrared, electronic, e.s.r., magnetic moment measurement and X-ray powder diffraction studies. The thermal decompostion of the complex led to NiO in air at about 338 ~ and in nitrogen at about 720 ~ The activation energies (E*) for the dehydration and decompostion reactions in air and nitrogen were evaluated. Tentative reaction mechanisms have been suggested for the termal decompostion of the complex in air and nitrogen.Although the oxalato complexes of nickel and other transition and nontransiton metals of the type MC204.rH20 and MI[M2(C204).]xH20 (where M 1 = K, NH4 and Na and M 2 = nickel and other metals) are well known [1][2][3][4][5], complexes of the type M[M(C204).].xH20 are relatively less known [6]. We have synthesized a series of oxalato complexes of the above type and their spectral and thermal studies were reported [7][8][9][10].As an extension of our work reported earlier we are reporting here the synthesis, characterization and thermal decomposition of nickel(II)bis(oxalato)nickelate(II)pentahydrate, Ni[Ni(C204)2].5H20.

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The absorption spectra of complex oxalates

Cited by 34 publications

References 10 publications

Carbon-13 Isotope Effects in Systems Containing Carbon Dioxide, Bicarbonate, Carbonate, and Metal Ions

Carbon-13 Isotope Effects in Systems Containing Carbon Dioxide, Bicarbonate, Carbonate, and Metal Ions

The alexandrite-like Cr-doped aluminum oxalato complexes

Thermal decompostion studies on nickel(II) bis(oxalato)nickelate(II) pentahydrate

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