Synthesis and Characterisation of Cobalt(II) Complexes of 3-Hydroxyflavone
Yang, Farina and D. A., Rice (1995) Synthesis and Characterisation of Cobalt(II) Complexes of 3-Hydroxyflavone. Pertanika Journal of Science & Technology, 3 (2). pp. 211-219. ISSN 0128-7680
The syn theses of diaquabis (3-hydroxyflavonato) cobalt(II) and bis(pyridine) bis (3hydroxyflavonato) cobalt(II) are described. Results from infrared spectra clearly show that the 3-hydroxyflavonato anion forms a chelate through the 3-hydroxy 4-keto groups. The electronic spectra of both complexes indicate that cobalt(II) has an octahedral geometry. Quantitative analyses of the isolated products gave good agreement with calculated values. Magnetic moment measurements show that both compounds are high spin £ cobalt(II) complexes. The powder diffraction pattern of the pyridine adduct gave almost 1:1 correspondence with tTans-bis (pyridine) bis (3-hydroxyflavonato) nickel (II) which has an octahedral geometry. Therefore, it is highly likely that bis(pyridine)bis(3hydroxyflavonato) cobalt(II) is octahedrally co-ordinated with two chelating 3-hydroxyflavonato anions and two pyridine molecules occupying tTans positions.
|Keyword:||cobalt(ll) complex, 3-hydroxyflavonato|
|Publisher:||Universiti Putra Malaysia Press|
|Deposited By:||Nasirah Abu Samah|
|Deposited On:||02 Dec 2009 02:54|
|Last Modified:||27 May 2013 07:11|
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