Open AccessSynthesis, Structure, Magnetic and Catalytic Competency of a Tetradentate (NNOO) Schiff Base Mediated Dimeric Copper(II) Complex
Author(s) -
Habibar Chowdhury,
Rajesh Bera,
Chandan Adhikary
Publication year - 2021
Publication title -
asian journal of chemistry/asian journal of chemistry
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.145
H-Index - 34
eISSN - 0975-427X
pISSN - 0970-7077
DOI - 10.14233/ajchem.2021.23168
Subject(s) - chemistry , schiff base , copper , catalysis , cyclooctene , crystal structure , crystallography , magnetic susceptibility , styrene , selectivity , acetonitrile , medicinal chemistry , polymer chemistry , organic chemistry , polymer , copolymer
One dinuclear copper(II) complex {μ-[2,2′-{ethane-1,2-diylbis[(azanylylidene)methanylylidene]}-bis(phenolato)]}-{μ-[2,2′-{ethane-1,2-diylbis[(azanylylidene)methanylylidene]}bis(phenolato)]}-dicopper(II), [Cu2(salen)2] (1) [salen2− = [2,2′-{ethane-1,2-diylbis[(azanylylidene)methanylylidene]}-bis(phenolato)] has been isolated and characterized by X-ray diffraction analysis and spectroscopicstudies. X-ray single crystal structure examination revealed that each Cu(II) center in the asymmetricunit of 1 adopts a distorted square planar geometry with a CuN2O2 chromophore, where two asymmetricunits are attached through congregation of Salen involving Cu-O bond to form dinuclear molecularunit [Cu2(salen)2]. In crystalline state, these dinuclear entities in 1 are extended through C-H···πinteractions and π···π interactions displaying a 3D network structure. The variable-temperature magneticsusceptibility measurement asserted a dominant antiferromagnetic interaction between the copper(II)centers through Cu-O-Cu linkage in 1 with J = -1.46 cm-1. The catalytic efficacy of complex 1 wasstudied in a series of solvents for the oxidation of styrene and cyclooctene using tert-butyl-hydroperoxide(TBHP) as an active oxidant under mild conditions. The catalytic reaction mixture has been analyzedby gas chromatography and it displayed that the yield of the epoxidation and its selectivity is optimumin acetonitrile medium.