Mangalam Neema Ani, Kurup M R Prathapachandra
Department of Applied Chemistry, Cochin University of Science and Technology, Kochi 682022, Kerala, India.
Spectrochim Acta A Mol Biomol Spectrosc. 2009 Jan;71(5):2040-4. doi: 10.1016/j.saa.2008.07.043. Epub 2008 Aug 5.
Four oxovanadium and one dioxovanadium complex with 2-hydroxyacetophenone N(4)-phenylthiosemicarbazone (H(2)L) which are represented as [VOLphen].2H(2)O (1), [VOLbipy] (2), [VOLdmbipy] (3), VOL (4) and [VO(2)HL].CH(3)OH (5) have been synthesized and characterized by elemental analyses, electronic, infrared and EPR spectral techniques. In all the complexes 1-4 the ligand coordinates through phenolic oxygen, azomethine nitrogen and thiolate sulfur. But in complex [VO(2)HL].CH(3)OH, coordination takes place in thione form instead of thiolate sulfur. All the complexes except [VO(2)HL].CH(3)OH are EPR active due to the presence of an unpaired electron. In frozen DMF at 77K, all the oxovanadium(IV) complexes show axial anisotropy with two sets of eight line patterns.
已合成了四种氧钒配合物和一种二氧钒配合物，它们与2-羟基苯乙酮N(4)-苯基硫代半卡巴腙（H₂L）形成配合物，分别表示为[VOLphen]·2H₂O（1）、[VOLbipy]（2）、[VOLdmbipy]（3）、[VOL]₂（4）和[VO₂HL]·CH₃OH（5），并通过元素分析、电子光谱、红外光谱和电子顺磁共振光谱技术对其进行了表征。在所有配合物1 - 4中，配体通过酚氧、偶氮甲碱氮和硫醇盐硫进行配位。但在配合物[VO₂HL]·CH₃OH中，配位是以硫酮形式而非硫醇盐硫进行。除[VO₂HL]·CH₃OH外，所有配合物由于存在未成对电子而具有电子顺磁共振活性。在77K的冷冻N,N-二甲基甲酰胺中，所有氧钒（IV）配合物均表现出具有两组八条线模式的轴向各向异性。
