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首页> 外文期刊>Zeitschrift fur Anorganische und Allgemeine Chemie >Dialkyl-[5]trovacenylethynylaluminum and -gallium compounds {[5]trovacenyl = (η~7-C_7H_7)V(eta;~5-C _5H_(4-))} - On the magnetic exchange interactions across spacers with electron deficient bond segments
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Dialkyl-[5]trovacenylethynylaluminum and -gallium compounds {[5]trovacenyl = (η~7-C_7H_7)V(eta;~5-C _5H_(4-))} - On the magnetic exchange interactions across spacers with electron deficient bond segments

机译:二烷基-[5] trovacenylethynyl铝和-镓化合物{[5] trovacenyl =(η〜7-C_7H_7)V(eta;〜5-C _5H_(4-))}-关于具有电子缺陷键的间隔基的磁交换相互作用段

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摘要

Treatment of [5]trovacenylethyne, (η~7-C_7H _7)V(η~5-C_5H_4-C≡C-H) (1) with dialkylelement hydrides R_2E-H (2: E = Al, R = tBu; 3: E = Ga, R = Et; 4: E = Ga, R = tBu) afforded, the corresponding alkynyl-dialkylelement compounds by the release of dihydrogen. The paramagnetic compounds 2 to 4 are dimeric in the solid state with the terminal, anionic carbon atoms of the C≡C triple bonds in the bridging positions. IR spectroscopic investigations reveal that in non-polar solvents the dimeric form persists. The immeasurably small exchange coupling in 2 to 4 (EPR) must be traced to the electron deficient fourmembered ring, which is part of the spacer. Quantum-chemical calculations verify the localization of the spin density essentially at the vanadium atoms.
机译:用二烷基元素氢化物R_2E-H(2:E = Al,R = tBu; 3:E)处理[5] trovacenylethyne,(η〜7-C_7H _7)V(η〜5-C_5H_4-C≡CH)(1) = Ga,R = Et; 4:E = Ga,R = tBu),通过释放二氢得到相应的炔基-二烷基元素化合物。顺磁性化合物2-4为固态的二聚体,在桥连位置具有C≡C三键的末端阴离子碳原子。红外光谱研究表明,在非极性溶剂中,二聚体形式持续存在。 2至4(EPR)中不可估量的小交换耦合必须追溯到缺电子的四元环,该环是间隔基的一部分。量子化学计算证实了自旋密度基本上位于钒原子上。

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