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

Atanu Jana, Saugata Konar, Sangita Ray, Shie Ming Peng, G. H. Lee, Ray J. Butcher, Tian Huey Lu, Anil Kumar Barik, Sachindranath Pal, Susanta Kumar Kar

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Abstract

Two cobalt(III) complexes [Co(L1)2]ClO4 (1) [HL 1= N-ethyl-2-((5-methyl-1H-pyrazol-3-yl)methylidene) hydrazinecarbothioamide] and [Co(L2)2]ClO 4.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)2.2H 2O (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.

Original languageEnglish
Pages (from-to)1334-1342
Number of pages9
JournalIndian Journal of Chemistry - Section A Inorganic, Physical, Theoretical and Analytical Chemistry
Volume50
Issue number9-10
StatePublished - Sep 2011

Keywords

  • Cobalt
  • Coordination chemistry
  • Nickel
  • Pyrazoles
  • Pyrimidines
  • Thiosemicarbazones
  • X-ray structure

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