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 language | English |
---|---|
Pages (from-to) | 3006-3016 |
Number of pages | 11 |
Journal | Polyhedron |
Volume | 25 |
Issue number | 15 |
DOIs | |
Publication status | Published - 3 Nov 2006 |
Keywords
- Azide
- Cobalt(II)
- Hmt
- Hydrothermal synthesis
- L-M-L type co-ordination polymers
- Thiocyanate