A. Mansour
Nov 1, 2013
Citations
0
Influential Citations
19
Citations
Journal
Inorganica Chimica Acta
Abstract
Abstract On performing a reaction between (1H-benzimidazol-2-ylmethyl)-N-phenyl amine (H 2 L) and copper(II) acetate in methanol, a green “paddle-wheel” copper(II) complex, [Cu 2 (CH 3 COO) 4 (H 2 L) 2 ] ( 1 ), was separated after about 5 min. The two Cu atoms are separated by 2.852 A and bridged by four bidentate acetate groups with Cu–O distance of 2.012–2.043 A as calculated by DFT/B3LYP method. As the reflux continues, the reaction mixture was rapidly turned brown, and a polymeric complex, {[Cu 2 (CH 3 COO) 3 (H 2 O) 2 (HL)]} n ( 2 ), was separated. In complex 2 , the benzimidazole ligand serves as a bridge between dimeric Cu 2 (CH 3 COO) 3 (H 2 O) 2 units via the benzimidazole moiety. The anionic effect was established by comparing complexes ( 1 ) and ( 2 ) with [Cu(H 2 L) 2 (OH 2 ) 2 Cl]·Cl ( 3 ). Variable temperature magnetic susceptibility measurements of compound 2 showed occurrence of large anti-ferromagnetic interactions caused by the presence of syn – syn conformation of bridged acetate groups in terms of direct interaction, and π–π super exchange pathway of the benzimidazolate moiety.