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A STUDY OF NICKEL(II) AND COBALT(II) PHOSPHATE COMPLEXES,
MASSACHUSETTS INST OF TECH CAMBRIDGE RESEARCH LAB OF ELECTRONICS
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The metal binding constants and rate constants have been measured for the formation of the NiII and CoII complexes of pyrophosphate and tripolyphosphate. The binding constants were determined with a pH titration method at metal to ligand ratios of 11 and 21. The binding constants for the CoII complexes are slightly greater than the corresponding ones for NiII. The rate constants for complex formation and dissociation were measured for some of the complexes with the temperature jump method. The relaxation times measured ranged from 50 micro sec. to 3 milli sec. The results suggest that the rate of dissociation of a water molecule from the inner hydration shell of the metal ion is rate determining for complex formation, but that the highly charged igands can accelerate this rate somewhat in the case of CoII. Author
APPROVED FOR PUBLIC RELEASE