Syntheses and structures of neutral dicopper(I) halide complexes with bispyridylpyrrole ligand

摘要

A new class of neutral dicopper(I)-halide complexes with {Cu-2(mu-X)} (X = Cl, Br and I) core supported by bispyridylpyrrole ligand have been synthesized and characterized. Replacements of chloride ligand in [Cu2(mu-X)(2)(PPh3)(3)] (X = Cl, Br, I) by the anionic PDPH (PDPH = 2,5-bis(2'-pyridyl) pyrrole) or PDPBr (PDPBr = 2,5-bis(6'-bromo-2'-pyridyl)-pyrrole) ligand gives complexes 1-6. They are [(PDPH) Cu2(l-X)(PPh3) 2] (X = Cl (1); Br (2); I (3)) and [(PDPBr) Cu2(l-X)(PPh3) 2] (X = Cl (4); Br (5); I (6)). The X-ray crystallographic studies reveal these complexes are isostructural. Two phosphine-copper(I) units are linked by one halogen atom and one nitrogen atom from bridging bispyridylpyrrole ligand to form 4-membered Cu2XN core. Each copper atom is located in the center of distorted tetrahedral geometry. The PDPH and PDPBr ligands display mu(2)-k(2)(N, N'), k(2)(N', N") bonding mode. The separation of Cu...Cu in 1-6 is in the range of 2.6708(15)-2.7959(6)angstrom. The photophysical properties of 1-6 are described. (C) 2015 Elsevier B.V. All rights reserved.