Synthesis and crystal structure of a group of phenoxo-bridged heterodinuclear [Ni II Hg II ] Schiff base complexes (original) (raw)

This article appeared in a journal published by Elsevier. The attached copy is furnished to the author for internal non-commercial research and education use, including for instruction at the authors institution and sharing with colleagues. Other uses, including reproduction and distribution, or selling or licensing copies, or posting to personal, institutional or third party websites are prohibited. In most cases authors are permitted to post their version of the article (e.g. in Word or Tex form) to their personal website or institutional repository. Authors requiring further information regarding Elsevier's archiving and manuscript policies are encouraged to visit: http://www.elsevier.com/copyright a b s t r a c t Four new heterodinuclear complexes of a group of the general formula, [NiHg(L)Cl 2 ] where the Schiff base anion, L = 2,2 0-[propane-1,2-diylbis(nitrilomethylylidene)] diphenolate (L 1), (1); 2,2 0-[propane-1,2-diyl-bis(nitriloeth-1-yl-1-ylidene)] diphenolate (L 2), (2); 2,2 0-[propane-1,2-diylbis(nitriloprop-1-yl-1-yli-dene)] diphenolate (L 3), (3) and 2,2 0-[propane-1,3-diylbis(nitrilomethylylidene)] diphenolate (L 4), (4) have been prepared. The syntheses have been achieved by reacting equimolar amounts of nickel perchlo-rate, mercuric chloride and the respective tetradentate Schiff base ligand (H 2 L) in methanol medium. The complexes have been characterized by microanalytical, spectroscopic, single crystal X-ray diffraction and other physicochemical studies. Structural studies on 1–4 reveal the presence of a heterodinuclear [Ni II Hg II ] unit in which the central Ni(II) and Hg(II) ions are connected to each other by two phenolate oxygen bridges. In each of the complexes, the Ni(II) ion adopts a distorted square planar (NiO 2 N 2) geometry while the Hg(II) ion assumes a distorted tetrahedral arrangement (HgO 2 Cl 2). The dinuclear units in 1–4 are self-assembled through weak intermolecular p.. . interactions to build up supramolecular network in their solid state.