Physical properties of some binuclear copper (II) complexes
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1969
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Abstract
The copper(II) complexes of citric acid and N,N'-diglycylethyl-enediamine have been studied in aqueous solutions in the pH range 2 to 10 electron spin resonance, nuclear magnetic resonance, optical spectrophotometry, and the Gouy magnetic susceptibility technique. The complexes were studied in the temperature range 77 to 298°K at constant ionic strength. Results of these measurements have been correlated with reported potentiometric data. The relative amounts of the different complexes present in solution have been determined from the esr and potentiometric measurements. Nmr chemical shifts and Gouy measurements have been used to calculate the paramagnetic susceptibilities. Nmr linewidth studies were used to estimate the number of coordinating water molecules. The results provide further evidence for dimer formation in solution and show that the paramagnetic susceptibilities are independent of pH. Both systems are considered as possible models for some of the blue copper proteins.
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Major chemistry