Three Transition Metal Complexes Based on a Rigid Ligand Containing Bis(2-Benzimidazolyl) Groups: Syntheses and Crystal Structures

Key Words:Transition metal complex; Bis(benzimidazoles); Crystal structure; UV-Vis spectra

Abstract:Three new complexes ([Cu(OBimB)(2)](Cl)(2)center dot(EtOH)(2)center dot(H2O)(2) 1, [Cu(OBimB)(2)](NO3)(2)center dot(EtOH)(2) 2, [Ni(OBimB)(2)](NO3)(2)center dot(MeCN)(2) 3 based on a rigid bis(benzimidazoles) ligand OBimB (OBimB = 1,2-bis(2-benzimidazolyl)benzene) have been synthesized and structurally characterized by X-ray single crystal diffractometry. In the structures of the three complexes each metal ion is coordinated by four N atoms from two twisted V-shaped conformational OBimB ligands in a square-planar geometry. The complex units are further linked into a 2D layer supramolecular network by hydrogen bonds and pi center dot center dot center dot pi stacking interactions. The electronic absorption spectra of 1, 2, 3 have also been investigated and show that the two transitions around 220 and 280 nm are mainly assigned to intramolecular charge transfer transitions of the ligand (IL).

Volume:42

Issue:7

Translation or Not:no