Structures, fluorescent properties of the Ag(I) compounds based on molecular clips with biphenyl core

摘要

Three silver complexes Ag-2(L)(2)(NO3)(2) (1), Ag-2(L)(2)(SO3CF3)(2)(H2O)(0.5) (2), and [Ag-2(L)(2)(NO3)(2)](n) (3) were prepared from molecular clips, 2,2'-Bis(imidazol-1-ylmethyl)-biphenyl (L) and structurally characterized to investigate the structural-luminescent relation. Compound 1 is a bimetallic supramolecular rectangle in which two L ligands are connected by two linearly coordinated Ag(I) ions. Compound 2 is described as a double helicate due to the nature of the twist of the imidazole groups after coordination to Ag(I) centers. In compound 3, the Ag(I) centers are connected by L ligands into a one-dimensional zigzag chain. Solid state and solution fluorescent measurements exhibit the presence of ligand-based emission at 415 and 435 nm of compounds 1 and 2, respectively. It is said that the dihedral angles between the two imidazole rings coordinated to one Ag(I) center affect the emission properties. (C) 2006 Elsevier B.V. All rights reserved.