Polyhedron p. 25 - 32 (2015)
Update date:2022-08-11
Topics:
Asatkar, Ashish K.
Panda, Snigdha
Zade, Sanjio S.
A new series of thiophene-based ligands has been developed. The reactions of 2-formyl-3-(hydroxyl/methoxy)thiophene with ethylenediamine yielded the thiophene-based salen ligands 7/8. Whereas the reaction of 2-formyl-3-methoxythiophene with 1,2-diaminobenzene, under similar conditions, unexpectedly, afforded 1,2-substituted benzimidazole based ligand 9. Formation of benzimidazole derivative, without any catalyst, is proposed to be induced by nucleophilic attack of methoxy group. Structures and supramolecular assemblies of all the ligands were studied by single crystal X-ray crystallography. Existence of the different tautomeric forms of ligand 7 was observed in solid and solution phases. The reaction of ligand 7 with CuCl2 afforded a bimetallic complex (7-Cu)2. The structure of (7-Cu)2 was confirmed by single crystal X-ray crystallography. Complex (7-Cu)2 exists in dimeric form through oxygen-copper bridged out-of-plane bonding with Cu(II) in a distorted square pyramidal geometry. Cyclic voltammogram of (7-Cu)2 displayed reversible Cu(II)/Cu(I) redox couple.
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