TY - JOUR
T1 - Syntheses, crystallographic characterization, catecholase activity and magnetic properties of three novel aqua bridged dinuclear nickel(II) complexes
AU - Modak, Ritwik
AU - Sikdar, Yeasin
AU - Mandal, Senjuti
AU - Chatterjee, Sudipta
AU - Bieńko, Alina
AU - Mroziński, Jerzy
AU - Goswami, Sanchita
N1 - Funding Information:
Financial support from the University Grants Commission for a RFSMS Fellowship (Sanction No. UGC/740/RFSMS) to R. Modak, DST for a junior research fellowship to Y. Sikdar (Sanction No. SERB/F/1585/2012-13, project No. SR/FT/CS-107/2011) and University Grants Commission for a junior research fellowship to S. Mandal (Sanction No. UGC/749/Jr. Fellow(Sc.)) is gratefully acknowledged. DST-FIST is acknowledged for providing the X-ray diffraction facility at the Department of Chemistry, University of Calcutta. This research was supported by the National Science Centre (Poland) under grant No. 2011/01/B/ST5/01624 . We sincerely thank Dr. Prasanta Ghosh of R. K. Mission Residential College, Narendrapur, Kolkata, for his help in EPR measurement.
PY - 2014/5/24
Y1 - 2014/5/24
N2 - Three novel μ2-aqua bridged dinuclear Ni(II) complexes, [Ni2(HL1)4(H2O)] (1), [Ni 2(HL2)4(H2O)] (2) and [Ni 2(HL3)4(H2O)] (3) have been synthesized using Schiff base ligands derived from 5-amino-1-pentanol and salicylaldehyde (H2L1), 5-bromo salicylaldehyde (H 2L2) and 3-methoxy salicylaldehyde (H2L 3), respectively. They are characterized by a variety of physical techniques including elemental analysis, infrared and UV-Vis spectroscopy, NMR, cyclic voltammetry, variable temperature magnetic measurements and single crystal X-ray diffraction. X-ray crystallographic analysis reveals that all the three complexes possess distorted octahedral environment with a bridging aqua ligand. Complexes 1 and 3 exhibit 3D supramolecular architecture whereas 2 demonstrates a 2D netlike arrangement along ab plane. Catecholase activity of the dinuclear Ni(II) systems are investigated using 3,5-di-tert-butylcatechol as the substrate. The complexes are efficient catalysts with turnover numbers 1.87 × 104, 1.79 × 104 and 1.38 × 10 4 h-1 for 1, 2 and 3, respectively. The probable structures of the intermediates formed during the process are proposed on the basis of kinetic and spectral analyses. The magnetic data disclose that weak ferromagnetic couplings are transmitted between the metal centers and the magnetic properties are correlated with the structural features around the Ni(II) centers.
AB - Three novel μ2-aqua bridged dinuclear Ni(II) complexes, [Ni2(HL1)4(H2O)] (1), [Ni 2(HL2)4(H2O)] (2) and [Ni 2(HL3)4(H2O)] (3) have been synthesized using Schiff base ligands derived from 5-amino-1-pentanol and salicylaldehyde (H2L1), 5-bromo salicylaldehyde (H 2L2) and 3-methoxy salicylaldehyde (H2L 3), respectively. They are characterized by a variety of physical techniques including elemental analysis, infrared and UV-Vis spectroscopy, NMR, cyclic voltammetry, variable temperature magnetic measurements and single crystal X-ray diffraction. X-ray crystallographic analysis reveals that all the three complexes possess distorted octahedral environment with a bridging aqua ligand. Complexes 1 and 3 exhibit 3D supramolecular architecture whereas 2 demonstrates a 2D netlike arrangement along ab plane. Catecholase activity of the dinuclear Ni(II) systems are investigated using 3,5-di-tert-butylcatechol as the substrate. The complexes are efficient catalysts with turnover numbers 1.87 × 104, 1.79 × 104 and 1.38 × 10 4 h-1 for 1, 2 and 3, respectively. The probable structures of the intermediates formed during the process are proposed on the basis of kinetic and spectral analyses. The magnetic data disclose that weak ferromagnetic couplings are transmitted between the metal centers and the magnetic properties are correlated with the structural features around the Ni(II) centers.
UR - http://www.scopus.com/inward/record.url?scp=84898788752&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=84898788752&partnerID=8YFLogxK
U2 - 10.1016/j.ica.2014.03.008
DO - 10.1016/j.ica.2014.03.008
M3 - Article
AN - SCOPUS:84898788752
SN - 0020-1693
VL - 416
SP - 122
EP - 134
JO - Inorganica Chimica Acta
JF - Inorganica Chimica Acta
ER -