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Dinuclear Complexes of M II Thiocyanate (M = Ni and Cu) Containing a Tridentate Schiff‐Base Ligand: Synthesis, Structural Diversity and Magnetic Properties
Author(s) -
Banerjee Suparna,
Drew Michael G. B.,
Lu CanZhong,
Tercero Javier,
Diaz Carmen,
Ghosh Ashutosh
Publication year - 2005
Publication title -
european journal of inorganic chemistry
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.667
H-Index - 136
eISSN - 1099-0682
pISSN - 1434-1948
DOI - 10.1002/ejic.200500080
Subject(s) - chemistry , crystallography , schiff base , thiocyanate , ligand (biochemistry) , salicylaldehyde , magnetic susceptibility , octahedron , square pyramidal molecular geometry , crystal structure , molecule , antiferromagnetism , stereochemistry , inorganic chemistry , biochemistry , receptor , organic chemistry , physics , condensed matter physics
Abstract A dinuclear Ni II complex, [Ni 2 ( L ) 2 (H 2 O)(NCS) 2 ] · 3H 2 O ( 1 ) in which the metal atoms are bridged by one water molecule and two μ 2 ‐phenolate ions, and a thiocyanato‐bridged dimeric Cu II complex, [Cu( L )NCS] 2 ( 2 ) [ L = tridentate Schiff‐base ligand, N ‐(3‐aminopropyl)salicylaldimine, derived from 1:1 condensation of salicylaldehyde and 1,3‐diaminopropane], have been synthesized and characterized by IR and UV/Vis spectroscopy, cyclic voltammetry and single‐crystal X‐ray diffraction studies. The structure of 1 consists of dinuclear units with crystallographic C 2 symmetry in which each Ni II atom is in a distorted octahedral environment. The Ni–O distance and the Ni–O–Ni angle, through the bridged water molecule, are 2.240(11) Å and 82.5(5)°, respectively. The structure of 2 consists of dinuclear units bridged asymmetrically by di‐μ 1,3 ‐NCS ions; each Cu II ion is in a square‐pyramidal environment with τ = 0.25. Variable‐temperature magnetic susceptibility studies indicate the presence of dominant ferromagnetic exchange coupling in complex 1 with J = 3.1 cm –1 , whereas complex 2 exhibits weak antiferromagnetic coupling between the Cu II centers with J = –1.7 cm –1 . (© Wiley‐VCH Verlag GmbH & Co. KGaA, 69451 Weinheim, Germany, 2005)