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首页> 外文期刊>Zeitschrift fur Anorganische und Allgemeine Chemie >Multifaceted coordination chemistry of vanadium(V): Substitution, rearrangement reactions, and condensation reactions of oxovanadium(V) complexes of the tripodal oxygen ligand L-OMe(-) = [eta(5)-(C5H5)Co{P(OMe)(2)(O)}(3)](-)
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Multifaceted coordination chemistry of vanadium(V): Substitution, rearrangement reactions, and condensation reactions of oxovanadium(V) complexes of the tripodal oxygen ligand L-OMe(-) = [eta(5)-(C5H5)Co{P(OMe)(2)(O)}(3)](-)

机译:钒(V)的多方面配位化学:三脚架氧配体L-OMe(-)= [eta(5)-(C5H5)Co {P(OMe))的氧钒(V)配合物的取代,重排反应和缩合反应(2)(O)}(3)](-)

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摘要

The octahedral oxovanadium(V) complex [V(O)F2LOMe] of the tripodal oxygen ligand LOMe-=[eta(5)-(C5H5)Co{P(OMe)(2)(O)}(3)](-) reacts with alcohols and phenol with substitution of one fluoride ligand to form alkoxo complexes [V(O)F(OR)L-OMe], R = Me, Et, i-Prop, Ph. In the presence of water, however, both fluoride ions are substituted and a complex with the composition VO2LOMe can be isolated. The crystal structure shows that the oxo-bridged trimer [{V(O)(L-OMe)O}(3)] was synthesized. In the presence of BF3 the fluoride ligand in the alkoxo-complex [V(O)F(OEt)L-OMe] can be exchanged for pyridine to yield [V(O)(OEt)pyL(OMe)]BF4. Analogous attempts to exchange the fluoride ligand for tetrahydrofuran and acetonitrile induces a rearrangement reaction that leads to the vanadium complex [V(O)(L-OMe)BF4. The crystal structure of this compound has been determined. Its H-1 and P-31-NMR spectra show that it is a highly fluxional vanadium complex at ambient temperature in solution. The two tripodal ligands LOMe- coordinate the vanadium centre as bidentate or tridentate ligands. The exchange bidentate/tridentate becomes slow on the NMR time scale below about 200 K.
机译:三脚架氧配体LOMe-= [eta(5)-(C5H5)Co {P(OMe)(2)(O)}(3)](-的八面体氧钒(V)络合物[V(O)F2LOMe] )与醇和苯酚反应,被一个氟化物配体取代,形成烷氧基络合物[V(O)F(OR)L-OMe],R = Me,Et,i-Prop,Ph。但是,在水的存在下,两个氟离子都被取代,可以分离出具有VO2LOMe组成的配合物。晶体结构表明,合成了氧桥三聚体[{V(O)(L-OMe)O}(3)]。在存在BF3的情况下,可以将烷氧基配合物[V(O)F(OEt)L-OMe]中的氟化物配体换成吡啶,生成[V(O)(OEt)pyL(OMe)] BF4。将氟化物配体交换为四氢呋喃和乙腈的类似尝试引起了重排反应,该反应导致了钒络合物[V(O)(L-OMe)BF4。该化合物的晶体结构已经确定。它的H-1和P-31-NMR光谱表明,它在环境温度下是溶液中的高通量钒络合物。两个三脚架配体LOMe-将钒中心配制成二齿或三齿配体。在低于200 K的NMR时间尺度上,交换二齿/三齿变慢。

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