Two new hydrothermally synthesised L-M-L type cobalt(II) hydrogen bonded co-ordination complexes with mixed ligands: Characterisation and magneto-structural correlation

Joy Chakraborty, Brajagopal Samanta, G. Rosair, Volker Gramlich, M. Salah El Fallah, Joan Ribas, T. Matsushita, Samiran Mitra

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Abstract

Two new hydrogen bonded polymeric L-M-L type Co(II) metal co-ordination complexes [{Co(hmt)2(NCS)2(H2O)2}{Co(NCS)2(H2O)4}(2H2O)] (1) and [Co(hmt)(NNN)2(H2O)2]n (2) have been synthesised under controlled hydrothermal condition and characterised by elemental analyses, FT-IR, UV/vis spectroscopy and thermal analyses. Here 1,3,5,7-tetraazatricyclo [3.3.1] decane [or hexamethylenetetramine (hmt)] has been used as a neutral organic bidentate spacer molecule. The structures of the complexes have been confirmed unequivocally from single crystal X-ray diffraction studies which reveals the presence of weak covalent and H-bonding interactions between octahedral Co(II) complexes. Magneto-structural correlations have been drawn from cryo-magnetic susceptibility measurements over a wide range of temperature (2-300 K) under 0.5 T magnetic fields. A weak antiferromagnetic interaction of J = -0.77 cm-1 found is as expected from X-ray structure determination. The high dimensionality of the structures is probably a manifestation of extensive weak covalent interactions and H-bondings. © 2006 Elsevier Ltd. All rights reserved.

Original languageEnglish
Pages (from-to)3006-3016
Number of pages11
JournalPolyhedron
Volume25
Issue number15
DOIs
Publication statusPublished - 3 Nov 2006

Keywords

  • Azide
  • Cobalt(II)
  • Hmt
  • Hydrothermal synthesis
  • L-M-L type co-ordination polymers
  • Thiocyanate

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    Chakraborty, J., Samanta, B., Rosair, G., Gramlich, V., Salah El Fallah, M., Ribas, J., Matsushita, T., & Mitra, S. (2006). Two new hydrothermally synthesised L-M-L type cobalt(II) hydrogen bonded co-ordination complexes with mixed ligands: Characterisation and magneto-structural correlation. Polyhedron, 25(15), 3006-3016. https://doi.org/10.1016/j.poly.2006.05.001