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

doi:10.1016/j.poly.2006.05.001

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

School of Engineering & Physical Sciences

Research output: Contribution to journal › Article

10 Citations (Scopus)

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	https://doi.org/10.1016/j.poly.2006.05.001
Publication status	Published - 3 Nov 2006

Keywords

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

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10.1016/j.poly.2006.05.001

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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

@article{dcb9bda983624e5cafa98886fb0f817b,

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

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. {\textcopyright} 2006 Elsevier Ltd. All rights reserved.",

keywords = "Azide, Cobalt(II), Hmt, Hydrothermal synthesis, L-M-L type co-ordination polymers, Thiocyanate",

author = "Joy Chakraborty and Brajagopal Samanta and G. Rosair and Volker Gramlich and {Salah El Fallah}, M. and Joan Ribas and T. Matsushita and Samiran Mitra",

year = "2006",

month = nov,

day = "3",

doi = "10.1016/j.poly.2006.05.001",

language = "English",

volume = "25",

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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, vol. 25, no. 15, pp. 3006-3016. https://doi.org/10.1016/j.poly.2006.05.001

Two new hydrothermally synthesised L-M-L type cobalt(II) hydrogen bonded co-ordination complexes with mixed ligands : Characterisation and magneto-structural correlation. / Chakraborty, Joy; Samanta, Brajagopal; Rosair, G.; Gramlich, Volker; Salah El Fallah, M.; Ribas, Joan; Matsushita, T.; Mitra, Samiran.

In: Polyhedron, Vol. 25, No. 15, 03.11.2006, p. 3006-3016.

Research output: Contribution to journal › Article

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

VL - 25

SP - 3006

EP - 3016

JO - Polyhedron

JF - Polyhedron

SN - 0277-5387

IS - 15

ER -