Add time:08/07/2019         Source:sciencedirect.com

Synthetic procedures are described that allow access to new copper(II) complexes with dipeptides containing the α-aminoisobutyric residue (Aib) as ligands. The solid complexes [Cu(H−1LA)]n·nH2O (1) (LAH=H-Aib-Gly-OH), [Cu(H−1LB)(MeOH)]n·nMeOH (2) (LBH=H-Aib-l-Leu-OH) and [Cu(H-1LC)]n (3) (LCH=H-Aib-l-Phe-OH) have been isolated and characterized by single-crystal X-ray crystallography, solid-state IR spectra and UV–Vis spectroscopy in solution (H−1L2− is the dianionic form of the corresponding dipeptide). Complexes 1 and 3 are three-dimensional coordination polymers with similar structures. The doubly deprotonated dipeptide behaves as a N(amino), N(peptide), O(carboxylate), O′(carboxylate), O(peptide) μ3 ligand and binds to one CuII atom at its amino and peptide nitrogens and at one carboxylate oxygen, to a second metal at the other carboxylate oxygen, while a third CuII atom is attached to the peptide oxygen. The geometry around copper(II) is distorted square pyramidal with the peptide oxygen at the apex of the pyramid. The structure of 2 consists of zigzag polymeric chains, where the doubly deprotonated dipeptide behaves as a N(amino), N(peptide), O(carboxylate), O′(carboxylate) μ2 ligand. The geometry at copper(II) is square pyramidal with the methanol oxygen at the apex. The IR data are discussed in terms of the nature of bonding and known structures. The UV–Vis spectra show that the solid-state structures of 1, 2 and 3 do not persist in H2O.

We also recommend Trading Suppliers and Manufacturers of H-GLY-PHE-LEU-OH (cas 15373-56-5). Pls Click Website Link as below: cas 15373-56-5 suppliers