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Journal of Coordination Chemistry Volume 62, 2009 - Issue 23
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Original Articles

Synthesis and spectral studies of nickel(II) complexes derived from disalicylaldehyde oxaloyldihydrazone

R.A. Lal Department of Chemistry, North-Eastern Hill University, Shillong 793022, Meghalaya, IndiaCorrespondence[email protected]
,
S. Choudhury Department of Chemistry, North-Eastern Hill University, Shillong 793022, Meghalaya, India
,
A. Ahmed Department of Chemistry, North-Eastern Hill University, Shillong 793022, Meghalaya, India
,
M. Chakraborty Department of Chemistry, North-Eastern Hill University, Shillong 793022, Meghalaya, India
,
R. Borthakur Department of Chemistry, North-Eastern Hill University, Shillong 793022, Meghalaya, India
&
A. Kumar Institute of Chemistry, Academia Sinica, 128 Academia Road, Sec.2, Nankang, Taipei, 115 Taiwan, R.O.C.
Pages 3864-3874 | Received 04 Feb 2009, Accepted 16 May 2009, Published online: 15 Oct 2009
 
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Abstract

The mononuclear nickel(II) complex [Ni(H2slox)(H2O)3] (1) and polymeric dinuclear complexes [Ni2(slox)(A4)] {A = H2O (2), py (3), 2-pic (4), 3-pic (5) and 4-pic (6)} and the discrete binuclear complexes [Ni2(slox)(NN)3] {NN = bpy (7) and phen (8)} have been synthesized from disalicylaldehyde oxaloyldihydrazone (H4slox) in methanol. All of the complexes are nonelectrolytes. Complexes 1, 7, and 8 are paramagnetic while binuclear 2–6 possess anomalously low μ eff value, indicating considerable metal–metal interaction. Discrete binuclear 7 and 8 have no interaction between the two nickel(II) ions. The anomalously low magnetic moment values in 2–6 are explained as metal–metal interaction via phenoxide bridge. Such metal–metal interactions are less in 7 and 8 due to coordination of bipyridine and phenanthroline molecules which do not allow phenoxide bridging. The dihydrazone coordinates to the metal center as a dibasic tridentate ligand in keto-enol form in staggered configuration in 1, while in the remaining complexes the dihydrazone is tetrabasic hexadentate in enol form in anticis configuration. The metal center has a tetragonally distorted octahedral stereochemistry.

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