Journal of the Chemical Society, Dalton Transactions p. 627 - 637 (1991)
Update date:2022-08-17
Topics:
Bailey, Neil A.
Fenton, David E.
Kitchen, Simon J.
Lilley, Terence H.
Williams, Mark G.
et al.
The interaction of CuII and NiII with two macrocycles L1 and L2, each containing an N3O2 donor set, has been investigated.Spectrophotometric studies in dimethyl sulphoxide reveal the formation of complexes with 1:1 and 1:2 metal:ligand ratios and conductometric studies in the same solvent indicated that all of the complexes were 1:2 electrolytes.Conductometric titration of the 1:1 copper(II) complexes with chloride in each case indicated the formation of a 1:1 electrolyte, presumably through co-ordination of a chloride ion to the central copper of each complex.Similar titration of the nickel(II) complexes gave evidence for the formation of dinuclear species; each of these was postulated to contain a bridging chloride anion.The stability constants of the complexes together with their enthalpies of co-ordination have been determined in 95percent methanol.Extraction and related transport experiments were carried out and under the conditions employed CuII was favoured over NiII.The X-ray crystal structures of the free macrocycle L1, the 1:1 complexes
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