Thermal,Magnetic, FTIR and XRD Study of New Co(II) and Ni(II) Theophyllinato Complexes with Benzylamine or Ethanolamine |
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Authors: | Gál S Madarász J Forizs E Labádi I Izvekov V Pokol G |
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Institution: | (1) Institute of General and Analytical Chemistry, Technical University of Budapest, H-1521 Budapest, Hungary;(2) Chemistry Department, Babeş, Bolyai University, RO-3400 Cluj-Napoca, Romania;(3) Department of Inorganic and Analytical Chemistry, József Attila University, H-6701 Szeged, P.O. Box 440, Hungary |
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Abstract: | Four new theophyllinato (th) complexes of Co(II) and Ni(II) were synthesized containing ethanolamine (2-aminoethanol, ea)
or benzylamine (ba). Comprehensive FTIR spectroscopic, powder XRD, magnetic and thermal studies on these mixed ligand complexes
have been carried out to get structural information. The almost identical FTIR spectra and XRD patterns of Co and Ni compounds
with same composition have indicated that Co(th)2(ba)2·2H2O (1) and Ni(th)2(ba)2·2H2O (2) or Co(th)2(ea)2 (3) and Ni(th)2(ea)2
(4) have very similar structure pair wise. The infrared spectra and X-ray diffraction patterns of thermally dehydrated 1 and
2containing benzylamine have allowed only to suggest that the co-ordination number around the metal centres is four, while
the high thermal stability of complexes 3and 4have indicated that they contain two of bidentate ethanolamine molecules in
octahedral co-ordination. A big difference observed between the magnetic moments of Co compounds 1and 3have proven that the
inner co-ordination sphere of complexes with benzylamine (1and 2) is tetrahedral, whilst that with ethanolamine (3and 4) is
basically octahedral, independent of the cation centres (Co or Ni).
This revised version was published online in July 2006 with corrections to the Cover Date. |
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Keywords: | 2-aminoethanol benzylamine magnetic moment mixed ligand complexes structure TG theophylline |
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