Issue 9, 1985

Synthesis, characterization and acid hydrolysis of [N,N-bis(2-aminoethyl)-1,2-ethanediamine]bis(solvent)cobalt(III) complexes

Abstract

Synthesis of the precursor [N,N-bis(2-aminoethyl)-1,2-ethanediamine]bis(trifluoromethanesulphonato-O)cobalt(III) trifluoromethanesulphonate allowed facile synthesis of the bis(dimethyl sulphoxide), bis(dimethylformamide), bis(trimethyl phosphate), and bis(acetonitrile) complexes by solvolysis of the trifluoromethanesulphonato-complex in dry solvents. The new bis(solvent) complexes were characterized by spectroscopic methods and by microanalysis. In aqueous acid, they hydrolyse in two consecutive steps which differ in rate by a factor of less than ten. While the complexes are stereochemically rigid as a consequence of co-ordination of the N,N-bis(2-aminoethyl)-1,2-ethanediamine tripodal ligand, the observed rate constants are composite terms since the two solvent ligands are in non-equivalent sites, and initial ligand loss from both sites occurs. N.m.r. experiments reveal that this loss proceeds at similar rates for each site.

Article information

Article type
Paper

J. Chem. Soc., Dalton Trans., 1985, 1923-1927

Synthesis, characterization and acid hydrolysis of [N,N-bis(2-aminoethyl)-1,2-ethanediamine]bis(solvent)cobalt(III) complexes

N. J. Curtis and G. A. Lawrance, J. Chem. Soc., Dalton Trans., 1985, 1923 DOI: 10.1039/DT9850001923

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