TY - JOUR
T1 - Two new hydrothermally synthesised L-M-L type cobalt(II) hydrogen bonded co-ordination complexes with mixed ligands
T2 - Characterisation and magneto-structural correlation
AU - Chakraborty, Joy
AU - Samanta, Brajagopal
AU - Rosair, G.
AU - Gramlich, Volker
AU - Salah El Fallah, M.
AU - Ribas, Joan
AU - Matsushita, T.
AU - Mitra, Samiran
PY - 2006/11/3
Y1 - 2006/11/3
N2 - 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.
AB - 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.
KW - Azide
KW - Cobalt(II)
KW - Hmt
KW - Hydrothermal synthesis
KW - L-M-L type co-ordination polymers
KW - Thiocyanate
UR - http://www.scopus.com/inward/record.url?scp=33749065942&partnerID=8YFLogxK
U2 - 10.1016/j.poly.2006.05.001
DO - 10.1016/j.poly.2006.05.001
M3 - Article
SN - 0277-5387
VL - 25
SP - 3006
EP - 3016
JO - Polyhedron
JF - Polyhedron
IS - 15
ER -