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Bulletin of the Korean Chemical Society (BKCS)

ISSN 0253-2964(Print)
ISSN 1229-5949(Online)
Volume 10, Number 2
BKCSDE 10(2)
February 20, 1989 

Magnetic and Spectroscopic Studies of some Oxovanadium(Ⅳ) Complexes having O = V(O)4 Chromophore
Sung-Nak Choi*, Young-Inn Kim, Yoon-Bo Shim, Hi-Shik Choo, Young-Jin Kim
Three oxovanadium(Ⅳ) complexes with bidentate ligands having only oxygen donor atoms, benzohydroxamic acid (Hben), 8-hydroxyquinoline-N-oxide(Hhqno) and picolinic acid-N-oxide (Hpicn) are prepared and magnetic and spectroscopic properties are investigated for the complexes VO(ben)2, VO(hqno)2 and VO(picn)2. Magnetic data together with IR results strongly indicate that dimeric intermolecular interaction is significant in VO(ben)2 while the presence of polymeric V-O‥V-O interaction is suggestive in VO(picn)2. For all three complexes, three electronic d-d transitions were observed; extremely strong optical absorption of these bands of VO(ben)2 in DMSO are supposed to be arised from a great metal-ligand covalency. Some fundamental vibration modes of oxovanadium(Ⅳ) complexes were empirically assigned from the differences in the spectrum of metal complexes with free ligand.
138 - 142
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