abstract
The reactions of HL1 [2-((2-(benzylthio)phenylimino)methyl)phenol] and HL2 [3-((2-(benzylthio)phenylimino)methyl)-2-hydroxy-5-methylbenzaldehyde] separately with Cu(OAc)2 center dot H2O afforded new Cu(II) complexes [Cu(L1)(OAc)] (1) and [Cu(L2)2] (2), respectively. These are characterized by microanalytical data and spectroscopic studies. UVvis spectra of the complexes show intense low-energy transitions approximate to 420nm which are ligand to metal charge transfer (LMCT) transitions. The single-crystal X-ray structures were determined for 1 and 2. Reactions of [Cu(L1)(OAc)] (1) with , SCN and show the replacement of weakly coordinated acetate yielding [Cu(L1)(N3)], [Cu(L1)(SCN)] and [Cu(L1)(NO2)], respectively. Unequivocal characterization of the substituted products has been done by single-crystal X-ray study of [Cu(L1)(N3)]. HL2 and its Cu(II) complex exhibited low-intensity emission bands at approximate to 575nm upon excitation at 375nm and at 420nm, respectively. Redox properties of the complexes were determined electrochemically. Density functional theory (DFT) computations have been carried out to explain the spectroscopic and redox properties of the complexes.
keywords
ONS DONOR LIGANDS; BETA-DIKETIMINATO LIGANDS; OXO-TRANSFER KINETICS; MAGNETIC-PROPERTIES; OXOMOLYBDENUM(IV) COMPLEXES; S-BENZYLDITHIOCARBAZATE; COBALT(III) COMPLEXES; BIOLOGICAL-ACTIVITY; CU(II) COMPLEXES; THIOSEMICARBAZONES
subject category
Chemistry
authors
Pattanayak, P; Pratihar, JL; Patra, D; Lin, CH; Brandao, P; Mal, D; Felix, V
our authors
Paula Cristina Ferreira da Silva Brandão
Assistant Researcher
Vítor Félix
Associate Professor with Aggregationacknowledgements
Special thanks to Professor Surajit Chattopadhyay, University of Kalyani, for his valuable suggestions throughout this study. The financial support from University Grants Commission is gratefully acknowledged (under Minor Research Project, Sanction No. F. PSW/067/2011-12). The necessary laboratory and infrastructural facility are provided by the Department of Chemistry, Kandi Raj College and Department of Chemistry, University of Kalyani.