Knowledge Bank

“The formation of complexes between neodymium and aliphatic carboxylic acids has been studied by spectrophotometric techniques and the results obtained correlated with other physico-chemical data on complex stabilities. Absolute success has not been obtained in this correlation, and an anomaly has been found in that, whilst with monocarboxylic acids the Nd 576 $m\mu$ band shifts toward higher wavelengths with increasing stability, a similar shift is found in polycarboxylic acids, with decreasing stability of the complex. In general, the band shift may be correlated with the molecular weight of the complexing agent, but not entirely with the stability of the complex formed.”