TY - JOUR
T1 - Dicopper(II) complexes of a tridentate pyrimidine derived Schiff base ligand
T2 - Syntheses, crystal structures and catalytic reactions
AU - Ray, Sangita
AU - Jana, Sreyashi
AU - Jana, Atanu
AU - Konar, Saugata
AU - Das, Kinsuk
AU - Chatterjee, Sudipta
AU - Butcher, Ray J.
AU - Kar, Susanta Kumar
PY - 2012/10/9
Y1 - 2012/10/9
N2 - Three new dinuclear Cu(II) complexes, [Cu2(L)2(L 1)]PF6 (1), [Cu2(L)2(L 2)]PF6 (2) and [Cu2(L)2(L 3)]PF6 (3), of a potentially tridentate NNO-donor Schiff base ligand [HL = 2-(2-(4,6-dimethylpyrimidin-2-yl)hydrazono)methyl)phenol] and the ancillary ligands [HL1 = benzoic acid, HL2 = salicylic acid, HL3 = 4-amino benzoic acid] have been synthesized and characterized by elemental analyses, IR, single crystal X-ray crystallography, spectroscopic, electrochemical and catalytic studies. The ligand HL is the [1+1] condensation product of salicylaldehyde with 2-hydrazino-4,6-dimethyl pyrimidine. In the complexes 1, 2 and 3, two Cu(II) centers are bridged by the carboxylic oxygen atoms of the respective acid moiety. All the metal centres have square-based pyramidal (SP) geometries (Γ = 0.120, 0.124, 0.109 for 1, 2 and 3, respectively). The dinuclear Cu(II) complexes show high catalytic activity and selectivity for the epoxidation of styrene, cyclohexene and cyclooctene using tert-butyl hydroperoxide (TBHP) as the oxidant.
AB - Three new dinuclear Cu(II) complexes, [Cu2(L)2(L 1)]PF6 (1), [Cu2(L)2(L 2)]PF6 (2) and [Cu2(L)2(L 3)]PF6 (3), of a potentially tridentate NNO-donor Schiff base ligand [HL = 2-(2-(4,6-dimethylpyrimidin-2-yl)hydrazono)methyl)phenol] and the ancillary ligands [HL1 = benzoic acid, HL2 = salicylic acid, HL3 = 4-amino benzoic acid] have been synthesized and characterized by elemental analyses, IR, single crystal X-ray crystallography, spectroscopic, electrochemical and catalytic studies. The ligand HL is the [1+1] condensation product of salicylaldehyde with 2-hydrazino-4,6-dimethyl pyrimidine. In the complexes 1, 2 and 3, two Cu(II) centers are bridged by the carboxylic oxygen atoms of the respective acid moiety. All the metal centres have square-based pyramidal (SP) geometries (Γ = 0.120, 0.124, 0.109 for 1, 2 and 3, respectively). The dinuclear Cu(II) complexes show high catalytic activity and selectivity for the epoxidation of styrene, cyclohexene and cyclooctene using tert-butyl hydroperoxide (TBHP) as the oxidant.
KW - Binuclear copper(II) complexes
KW - Catalytic epoxidation
KW - Pyrimidine derived ligand
KW - Spectral electrochemical properties
KW - X-ray crystal structures
UR - http://www.scopus.com/inward/record.url?scp=84865659772&partnerID=8YFLogxK
U2 - 10.1016/j.poly.2012.07.075
DO - 10.1016/j.poly.2012.07.075
M3 - Article
AN - SCOPUS:84865659772
SN - 0277-5387
VL - 46
SP - 74
EP - 80
JO - Polyhedron
JF - Polyhedron
IS - 1
ER -