Nickel complexes iminodiacetates

The complex formation between Ni(ii) and acetate ions in aqueous solution has been studied by C NMR. Equilibrium quotients (132) and rate parameters (133) for the ligand exchange processes are reported. Complexes of hydroxy-acids (134) and iminodiacetates RN(CH2C0 )2 (135) have been the subjects of further studies. Co(ii) complexes of malate, citrate, isocitrate, and monomethylcitrate all exhibit large shifts which may be accounted for by assuming a common structural unit [22] in which the ligand is tridentate. Nickel(ii)... 

The rate constants for the reaction of [Ni(nta)(H20)a] with various ligands in their neutral and protonated forms have been reported, as has that for the formation of the bis-complex of nickel(n) with the purine base theophylline. Rate constants have also been reported for the formation of bis-complexes of cobalt(n), nickel(n), and copper(n) with L-proline, L-hydroxypyroline, glycyl-L-leucine, , L-Ieucylglycine, a-alanine, jS-alanine, iminodiacetic acid, iminodipropionic acid, and aspartic acid. ... 

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