Oxalato complexes stability

The thermal decomposition of chromium(iii) oxalato-complexes has been shown to proceed via electron transfer and C—O bond fission, to afford CO2 and a smaller quantity of The stability constants of some chromium(m)... 

Complexes with succinate, glutarate and adipate have subnormal magnetic properties that indicate V-v-V interactions. Oxalato, malonato and maleato 1 1 complexes appeal monomeric as indicated by v(V=0) and and ease of formation, stability constants anc decrease in v(V=Q) follow the order oxalate>malonate>maleate. For the 1 2 complexes... 

E.s.r. spectra have been reported114 for several oxalato-chromium(m) complexes and the thermal decomposition products of Cr2(C204)3,6H20 characterized by X-ray powder photography.115 The stability constants for 1 1. 1 2. and 1 3 chromium(m) formato-116 and tartrato-117 complexes have been determined, and the constitution and charge of 1 1 and 1 2 chromium(m) complexes with aspartic acid and asparagine reported.118... 

The much higher rates for the oxalato and keto form of pynivato complexes are attributed to stabilization of the bridged interm iate by... 

There are numerous complexes of Cr(III) their stability is related to the (t2g) configuration. The chelate effect confers extra stability on the oxalato-(ethanedioato-) complexes. When water in the hexaaqua ion is replaced by three oxalate ligands, a trisoxalato-complex is formed in solution and can be readily prepared as a solid potassium salt. This exhibits optical isomerism. Geometrical isomerism is encountered in the cis- and tram- bisoxalato-complexes. The former exhibits optical isomerism. Although no solid containing the monooxalato-cation has been obtained, there is spectral evidence of its formation in solution. 

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