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Title: Synthesis and structural studies of cobalt(III) complexes of 5-methyl- 3-formylpyrazole-N(4)-ethyl/dimethyl thiosemicarbazone and nickel(II) complex of 2-S-methyl-6-methyl-4-formylpyrimidine-N(4)-ethyl thiosemicarbazone
Authors: Jana, Atanu
Konar, Saugata
Ray, Sangita
Peng, Shie-Ming
Lee, G H
Butcher, Ray J
Lu, Tian-Huey
Barik, Anil Kumar
Pal, Sachindranath
Kar, Susanta Kumar
Keywords: Coordination chemistry
X-ray structure
Issue Date: Sep-2011
Publisher: NISCAIR-CSIR, India
Abstract: Two cobalt(III) complexes [Co(L<sup>1</sup>)<sub>2</sub>]ClO<sub>4</sub> (<b style="">1</b>) [HL<sup>1</sup>= <i>N</i>-ethyl-2-((5-methyl-1<i>H</i>-pyrazol-3-yl)methylidene)hydrazine­carbo­thioamide] and [Co(L<sup>2</sup>)<sub>2</sub>]ClO<sub>4</sub>.CH<sub>3</sub>OH.H<sub>2</sub>O (<b>2</b>) [HL<sup>2</sup>=<i>N</i>,<i>N</i>-dimethyl-2-((5-methyl-1<i>H</i>-pyrazol-3-yl)methylidene) hydra­zine­carbothioamide]<sub> </sub>and one nickel(II) complex [Ni(HL<sup>3</sup>)<sub>2</sub>](ClO<sub>4</sub>)<sub>2</sub>.2H<sub>2</sub>O (<b>3</b>) [HL<sup>3</sup>=(2<i>E</i>)-<i>N</i>-ethyl-2-((6-methyl-2-(methyl­sulfanyl)pyrimidin-4-yl)methylidene)-hydrazinecarbothioamide] have been prepared and characterized by spectro­scopic studies and X-ray diffraction measurements. Structural study reveals that the coordination environment around each metal center is distorted octahedral. The two tridentate (NNS) uninegative pyrazole derived ligands in the cobalt(III) complexes (<b style="">1</b> and <b style="">2)</b> and the two similar neutral pyrimidine derived ligands in the nickel(II) complex (<b style="">3</b>) are coordinated to the central metal ions in the meridional fashion. The pyrazole N and thiolato S in (<b style="">1)</b> and (<b style="">2)</b> and pyrimidine N and thione S in (<b style="">3</b>) are <i>cis</i> to each other while azomethine N atoms are trans coordinated.
Description: 1334-1342
ISSN: 0975-0975(Online); 0376-4710(Print)
Appears in Collections:IJC-A Vol.50A(09-10) [September-October 2011]

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