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Unambiguous cis-coordination of mono- and bi-dentate Lewis bases to Ni(SN)2 Schiff-base complexes derived from S-alkyl dithiocarbazate |
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| Authors: | Xu-Hui Zhu Xiao-Feng Chen Xiao-Ming Ren Xiao-Zeng You SShanmuga Sundara Raj Hoong-Kun Fun |
| Institution: | a Coordination Chemistry Institute, State Key Laboratory of Coordination Chemistry, Nanjing University, Nanjing, 210093, People's Republic of China b X-Ray Crystallography Unit, School of Physics, Universiti Sains, Sains, Malaysia |
| Abstract: | The bidentate Schiff-base ligand, HL1, prepared by condensation of equivalent molar amount of o-nitrobenzaldehyde with S-benzyl dithiocarbazate, yielded the neutral square-planar complex, NiL12 (1) in the presence of Ni(OAc)2·4H2O. Addition of pyridine to (1) and phenanthroline (phen) to NiL (3) afforded the adducts NiL12(py)2·1.5H2O (2) and NiL(phen) (4), respectively, where H2L is a known quadridentate (NS)2 ligand. Single crystal X-ray analysis of (2) and (4) showed that the pyridine rings and phen occupy cis-positions in the octahedral adducts. In both cases, one N–Ni bond in the parent Ni(NS)2 complexes is severely perturbed, thus facilitating cis-addition of the Lewis bases. The present results together with those reported previously show that cis-addition is preferred in the addition reaction of Ni(NS)2 Schiff-base complexes derived from S-alkyl dithiocarbazate. Addition of pyridine and 2,2′-bipyridine to NiL (3) is also discussed. |
| Keywords: | Addition reaction Schiff-base complexes S-Alkyl dithiocarbazate Crystal structure Cis-addition |
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