Comparison of the formation constants of some chromium(II) and copper(II) complexes

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The stability constants of the complexes formed in the Cr2+-tartronate (taro), -L-tartrate (tart), -phthalate (phtal), -diethylenetriamine (dien), -triethylenetetramine (trien), -L-aspartate (asp), -L-glutamate (glu), -N-methyliminodiacetate(mimda), -ethylenediamine-N,N′-diacetate (edda), and -glycylglycine (glygly) systems in aqueous solution of 1 mol dm-3 KCl at 25 °C, determined pH-metrically, are as follows: log K1taro = 3.86, log K2taro = 2.08, log K1tart = 2.04, log K1phtal = 2.48, log K1dien = 6.67, log K2dien = 2.68, log K1trien = 7.33, log K1asp = 4.67, log K2asp = 3.46, log K1glu = 4.53, log K2glu = 2.96, log K1mimda = 5.42, log K2mimda = 3.28, log K1edda = 7,86, log K2edda = 2.1 8, log K1glygly = 2.15. Protonated complexes are formed in the Cr2+-tartronate, -tartrate, -aspartate, -glutamate, and -glycylglycine systems. The formation constants of the Cr2+ and Cu2+ complexes are compared and the effects of the different ionic radii and ligand structures are discussed. The significant similarity in the co-ordination properties of these two metal ions can be explained if it is assumed that the Jahn-Teller distortion affects their co-ordination behaviour in the same way.

Original languageEnglish
Pages (from-to)2721-2723
Number of pages3
JournalJournal of the Chemical Society, Dalton Transactions
Issue number12
Publication statusPublished - Jan 1 1986

ASJC Scopus subject areas

  • Chemistry(all)

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