Accession Number : AD0441444

Title :   A STUDY OF NICKEL(II) AND COBALT(II) PHOSPHATE COMPLEXES,

Corporate Author : MASSACHUSETTS INST OF TECH CAMBRIDGE RESEARCH LAB OF ELECTRONICS

Personal Author(s) : Hammes, Gordon G. ; Morrell, M. Lee

Report Date : 19 OCT 1963

Pagination or Media Count : 6

Abstract : The metal binding constants and rate constants have been measured for the formation of the Ni(II) and Co(II) complexes of pyrophosphate and tripolyphosphate. The binding constants were determined with a pH titration method at metal to ligand ratios of 1:1 and 2:1. The binding constants for the Co(II) complexes are slightly greater than the corresponding ones for Ni(II). 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 Co(II). (Author)

Descriptors :   *COMPLEX COMPOUNDS, *NICKEL COMPOUNDS, *PHOSPHATES, *COBALT COMPOUNDS, REACTION KINETICS, RELAXATION TIME, CHEMICAL EQUILIBRIUM, VOLUMETRIC ANALYSIS, DISSOCIATION.

Distribution Statement : APPROVED FOR PUBLIC RELEASE