Cubic clusters of indium chalcogenides with 2,2-bipyridine ligand, a comprehensive view of [InQ(phen/bpy)Cl]4 (Q=S, Se) compounds
摘要:
We have reported main group metal chalcogenido clusters of cubic [InQ(phen)Cl](4) (Q = S (1) and Se (2); phen = 1,10-phenanthroline). Herein two new cubic clusters with ligand of 2,2'-bipyridine (bpy) have been synthesized by solvothermal technique, [InSe(bpy)Cl](4) (3) and [InS(bpy)Cl](4)center dot H2O (4). The molecular structures and electronic states of compounds 3 and 4 are presented by comparing with those of 1 and 2. Though the clusters of 1-4 are similar, their packing structures show diverse modes. Spectroscopic study and theoretical calculation indicate that introducing phen/bpy to chalcogenido clusters can decrease the energy gap of frontier orbitals from HOMO to LUMO due to the cluster to ligand charge-transfer (CLCT). Increasing the conjugated system of the organic ligand or using the heavier chalcogenido element might improve the photophysical absorption of the materials. (C) 2011 Elsevier B.V. All rights reserved.