作者:M. Rombach、M. Gelinsky、H. Vahrenkamp
DOI:10.1016/s0020-1693(02)00748-x
日期:2002.5
Two new binary zinc-aminoacid complexes were crystallized: Zn(Ile)(2)(H2O)(2) is octahedral with two O,N-chelating aminoacid ligands; Zn(Phe)(2) is a one-dimensional coordination polymer with eta(2)-carboxylate bridges. The pyrazolylborate zinc complex Tp(Ph,Me)Zn-OH reacted with simple aminoacids to form the complexes Tp(Ph,Me)Zn-AA (AA = Gly, Val, Leu, Met, Phe, Trp) in which AA is a O,N-chelate ligand. In a similar fashion aminoacid-nitroanilides were deprotonated at the N atom yielding the Tp(Ph),Zn-Me complexes with the N,N-chelating ligands Gly-Nit, Ala-Nit and Leu-Nit. When terminal amino functions were missing, pure carboxylate coordination resulted, as in Tp(Ph,Me)Zn-GlyPheBoc and Tp(Ph,Me)Zn-AspPheOMe. Exclusive side-chain coordination was enforced in Bz-Tyr-OEt resulting in the Tp(Ph,Me)Zn complex with the phenolate-bound aminoacid. Combinations of the binding types (O,N-chelate+carboxylate, O,N-chelate+phenolate, O,N-chelate+thiolate) were realized in the binuclear complexes Tp(Ph,Me)Zn-AA-ZnTp(Ph,Me) for AA = Asp, Glu, Tyr and Cys. (C) 2002 Elsevier Science B.V. All rights reserved.