Synthesis and Characterisation of Cobalt(II) Complexes of 3-Hydroxyflavone
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 complexe...
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| Main Authors: | , |
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| Format: | Article |
| Language: | English English |
| Published: |
Universiti Putra Malaysia Press
1995
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| Online Access: | http://psasir.upm.edu.my/id/eprint/3864/1/Synthesis_and_Characterisation_of_Cobalt%28II%29.pdf http://psasir.upm.edu.my/id/eprint/3864/ |
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| Summary: | 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. |
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