Cationic (Azulene)(diene)rhodium(I) Complexes: Spectroscopic, Dynamic, and Catalytic Properties
作者:Andreas Johannes Rippert、Dimitri N. Laikov、Hans-Jürgen Hansen
DOI:10.1002/1522-2675(200208)85:8<2469::aid-hlca2469>3.0.co;2-d
日期:2002.8
[RhI(η5-azulene)(η4-diene)][BF4] complex salts 3–5 (diene=8,9,10-trinorborna-2,5-diene (nbd) and (1Z,5Z)-cycloocta-1,5-diene (cod)) were synthesized according to a known procedure (Scheme 1). All of these complexes show dynamic behavior of the diene ligand at room temperature. In the case of the [RhI(η5-azulene)(cod)]+ complex salts 3 and [RhI(η5-guaiazulene)(nbd)]+ complex salt 4a (guaiazulene=7-isopropyl-1
新的 [RhI(η5-azulene)(η4-diene)][BF4] 复合盐 3-5 (diene=8,9,10-trinorborna-2,5-diene (nbd) 和 (1Z,5Z)-cycloocta- 1,5-二烯 (cod)) 根据已知程序 (方案 1) 合成。所有这些配合物在室温下都表现出二烯配体的动态行为。在 [RhI(η5-azulene)(cod)]+ 复合盐 3 和 [RhI(η5-guaiazulene)(nbd)]+ 复合盐 4a (guaiazulene=7-isopropyl-1,4-dimethylazulene) 的情况下,确定了烯烃 H 原子的 1H-NMR 信号的聚结温度。二烯配体分子内运动的活化自由能(ΔG;表 1)表现出对配位薁配体的 HOMO/LUMO 特性的明显依赖性。DFT(密度泛函理论)计算的内部二烯旋转的 ΔG 值与在 CD2Cl2 作为溶剂中观察到的值非常吻合(表