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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;Cobalt;Nickel;Pyrazoles;Pyrimidines;Thiosemicarbazones;X-ray structure
Issue Date: Sep-2011
Publisher: NISCAIR-CSIR, India
Abstract: Two cobalt(III) complexes [Co(L1)2]ClO4 (1) [HL1= N-ethyl-2-((5-methyl-1H-pyrazol-3-yl)methylidene)hydrazine­carbo­thioamide] and [Co(L2)2]ClO4.CH3OH.H2O (2) [HL2=N,N-dimethyl-2-((5-methyl-1H-pyrazol-3-yl)methylidene) hydra­zine­carbothioamide] and one nickel(II) complex [Ni(HL3)2](ClO4)2.2H2O (3) [HL3=(2E)-N-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 (1 and 2) and the two similar neutral pyrimidine derived ligands in the nickel(II) complex (3) are coordinated to the central metal ions in the meridional fashion. The pyrazole N and thiolato S in (1) and (2) and pyrimidine N and thione S in (3) are cis to each other while azomethine N atoms are trans coordinated.
Page(s): 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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