Synthesis, structure and magnetic properties of mono- and di-nuclear nickel (II) thiocyanate complexes with tridentate N3 donor Schiff bases

Bhowmik, Pallab ; Chattopadhyay, Shouvik ; Drew, Michael G. B. ; Diaz, Carmen ; Ghosh, Ashutosh (2010) Synthesis, structure and magnetic properties of mono- and di-nuclear nickel (II) thiocyanate complexes with tridentate N3 donor Schiff bases Polyhedron, 29 (13). pp. 2637-2642. ISSN 0277-5387

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Official URL: http://www.sciencedirect.com/science/article/pii/S...

Related URL: http://dx.doi.org/10.1016/j.poly.2010.06.014

Abstract

The 1:1 condensation of N-methyl-1,3-diaminopropane and N,N-diethyl-1,2-diminoethane with 2-acetylpyridine, respectively at high dilution gives the tridentate mono-condensed Schiff bases N-methyl-N′-(1-pyridin-2-yl-ethylidene)-propane-1,3-diamine (L1) and N,N-diethyl-N′-(1-pyridin-2-yl-ethylidene)-ethane-1,2-diamine (L2). The tridentate ligands were allowed to react with methanol solutions of nickel (II) thiocyanate to prepare the complexes [Ni(L1)(SCN)2(OH2) (1) and [{Ni(L2)(SCN)} 2] (2). Single crystal X-ray diffraction was used to confirm the structures of the complexes. The nickel(II) in complex 1 is bonded to three nitrogen donor atoms of the ligand L1 in a mer orientation, together with two thiocyanates bonded through nitrogen and a water molecule, and it is the first Schiff base complex of nickel (II) containing both thiocyanate and coordinated water. The coordinated water initiates a hydrogen bonded 2D network. In complex 2, the nickel ion occupies a slightly distorted octahedral coordination sphere, being bonded to three nitrogen atoms from the ligand L2, also in a mer orientation, and two thiocyanate anions through nitrogen. In contrast to 1, the sixth coordination site is occupied by a sulfur atom from a thiocyanate anion in an adjacent molecule, thus creating a centrosymmetric dimer. A variable temperature magnetic study of complex 2 indicates the simultaneous presence of zero-field splitting, weak intramolecular ferromagnetic coupling and intermolecular antiferromagnetic interactions between the nickel (II) centers.

Item Type:Article
Source:Copyright of this article belongs to Elsevier Science.
Keywords:Crystal Structure; Nickel (II); Schiff Base; Coordinated Water; Centrosymmetric Dimer; Magnetic Study
ID Code:108334
Deposited On:13 Oct 2017 13:09
Last Modified:13 Oct 2017 13:09

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