Journal of the Chemical Society, Dalton Transactions p. 1331 - 1335 (1981)
Update date:2022-08-03
Topics:
Hefford, Robert J. W.
Pettit, Leslie D.
Co-ordiantion compounds formed between L-tyrosylglycine (H2L), L-tyrosyl-L-leucine, L-tyrosyl-D-leucine, glycyltyrosine, L-leucyl-L-tyrosine, and L-tyrosineamide a H+ and Cu2+ have been studied potentiometrically at 25 deg C and l=0.10 mol dm-3 (K(NO3)).In addition to the expected complex compounds (Cu(HL))+, (CuL), (Cu(H-1L))-, and (Cu(H-2L))2-, and (Cu(HL2))-, a binuclear complex, ((Cu(H-1L))2)2-, was found to form in the pH region 8-10.5 with tyrosylglycine and tyrosyl-D/L-leucine (giving a green solution) but was absent when tyrosine was the terminal carboxyl of the dipeptide.Spectrophotometric titrations showed this dimer to involve cooper(II)-phenolate oxygen bonding.A structure for the dimer is described which explains the absence of a comparable dimer with glycyl- and leucyl-tyrosine, and the stereoselectivity found with the tyrosyl-D/L-leucine diastereomers.
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