Mixed-ligand ternary complexes of potentially pentadentate but functionally tridentate Schiff base chelates

Ali, Mohammed Akbar, Mirza, Aminul Huq, Yee, Chiam Yin, Rahgeni, Hayatti and Bernhardt, Paul V. (2011) Mixed-ligand ternary complexes of potentially pentadentate but functionally tridentate Schiff base chelates. Polyhedron, 30 3: 542-548. doi:10.1016/j.poly.2010.11.019


Author Ali, Mohammed Akbar
Mirza, Aminul Huq
Yee, Chiam Yin
Rahgeni, Hayatti
Bernhardt, Paul V.
Title Mixed-ligand ternary complexes of potentially pentadentate but functionally tridentate Schiff base chelates
Journal name Polyhedron   Check publisher's open access policy
ISSN 0277-5387
1873-3719
Publication date 2011-02-01
Year available 2010
Sub-type Article (original research)
DOI 10.1016/j.poly.2010.11.019
Volume 30
Issue 3
Start page 542
End page 548
Total pages 7
Place of publication Oxford , United Kingdom
Publisher Pergamon
Collection year 2012
Language eng
Formatted abstract
The potentially pentadentate chelate 2,6-diacetylpyridine-bis(N-methyl-S-methyldithiocarbazate) (Nmedapsme) has been synthesized and structurally characterized by X-ray diffraction. Its reactions with nickel(II) salts did not lead to pentadentate coordinated ligand complexes but ternary complexes of general formula, [Ni(Nmedapsme)(nmesme)L]X·H2O (L = Br−, I−; X = I−, BF4−) where Nmedapsme binds as a tridentate and nmesme = N-methyl-S-methyldithiocarbazate. The related ternary nickel(II) complexes of formula, Ni(Nmedapsme)(nmetsc)Br2 has also been prepared and characterized. X-ray crystal structures of [Ni(Nmedapsme)(nmesme)I]I·H2O and [Ni(Nmedapsme)(nmesme)Br]BF4·H2O revealed that, in these complexes, the Nmedapsme ligand acts as a tridentate NNN donor while the distal S-donors are not coordinated. The bidentate (NS) ligand, nmesme coordinates to the nickel(II) ion via the amino nitrogen and the thione sulfur atoms, the sixth coordination site is occupied by an anion. In both complexes, the nickel(II) ion adopts a distorted octahedral configuration. The complex [Cu(nmesme)2(ONO2)]NO3 was obtained from an unsuccessful attempt to complex copper(II) with Nmedapsme. Hydrolysis of the parent Schiff base Nmedapsme occurred during complexation. An X-ray crystallographic structure analysis shows that the complex, [Cu(nmesme)2(ONO2)]NO3 has an approximately square–pyramidal geometry with the two nmesme ligands coordinated to the copper(II) ion as NS bidentate chelating agents via the amino nitrogen and thione sulfur atoms and the fifth coordination position of copper(II) is occupied by a monodentate nitrate ligand.
Keyword 2,6-Diacetylpyridine Schiff base of S-methyldithiocarbazate
Ternary nickel(II) complexes
Copper(II) complexes of N-methyl-S-methyldithiocarbazate
Q-Index Code C1
Q-Index Status Confirmed Code
Institutional Status UQ
Additional Notes Available online 25 November 2010

Document type: Journal Article
Sub-type: Article (original research)
Collections: Official 2012 Collection
School of Chemistry and Molecular Biosciences
 
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Created: Sun, 20 Mar 2011, 10:02:48 EST