S-methyl 3-(2-hydroxyphenyl) methylenedithiocarbazate (H2L1) and its nitro- (H2L2) and bromo derivatives (H2L3) as tridentate heterodonor (ONS)2− ligands offers a basic VO(ONS) core. In the presence of bidentate (N,N′) donor ancillar ligands, various mono- and dinuclear oxovanadium(IV) complexes [VOL(2,2′-bipy)] (1–3), [VOL(Phen)] (4, 5) and [LOV(μ-4,4′-bipy)VOL] (4, 5) and [LOV(μ-4,4′-bipy)VOL] (6–8) were
摘要[VO(acac)2]与S-甲基3-(2-羟苯基)亚甲基二
硫代
氨基甲酸酯(H2L1)及其硝基(H2
L2)和
溴代衍
生物(H2L3)作为三齿杂多给体(ONS)2-
配体的反应提供了基础VO(ONS)核心。在存在双齿(N,N')供体动脉
配体的情况下,各种单核和双核氧
钒(IV)络合物[VOL(2,2'-bipy)](1-3),[VOL(Phen)](4 ,5)和[LOV(μ-4,4'-bipy)VOL](4,5)和[LOV(μ-4,4'-bipy)VOL](6-8)。该化合物已通过EPR,电子和FAB质谱研究进行了表征。报告了代表性化合物[VO
L2(2,2'-bipy)](2)的X射线晶体结构,并显示三齿ONS
配体占据子午位置,从而导致八面体几何变形。氮供体占据根尖的位置具有反烟化作用,导致VO端键伸长。磁化率和EPR谱研究表明,双核络合物中
钒(IV)不成对电子的非相互作用性质(vbJ vb≈0)(6-8)。