Light-induced <i>cis/trans</i> isomerization of <i>cis</i>-[Pd(L-<i>S</i>,<i>O</i>)<sub>2</sub>] and <i>cis</i>-[Pt(L-<i>S</i>,<i>O</i>)<sub>2</sub>] complexes of chelating <i>N</i>,<i>N</i>-dialkyl-<i>N</i>′-acylthioureas: key to the formation and isolation of <i>trans</i> isomers
作者:Henry A. Nkabyo、D. Hannekom、Jean McKenzie、Klaus R. Koch
DOI:10.1080/00958972.2014.974584
日期:2014.12.17
dilute solutions at room temperature. The extent and relative rates of cis/trans isomerization induced by in situ laser light (λ = 405 nm) of cis-[Pd(L2-S,O)2] was directly monitored by 1H NMR and 195Pt NMR spectroscopy of selected cis-[Pt(L-S,O)2] compounds in chloroform-d; both with and without light irradiation allows the δ(195Pt) chemical shifts cis/trans isomer pairs to be recorded. The cis/trans
来自 N,N-二烷基-N'-苯甲酰硫脲 (HLn) 的顺式-[M(Ln-S,O)2] 复合物 (M = PtII, PdII) 用各种强可见多色或单色光源照射,λ < 500 nm 在有机溶剂中导致光诱导的顺式 → 反式异构化。在所有情况下,来自多个光源的白光或单色蓝紫激光 405 nm 光有效地导致溶液中出现大量反式异构体,如 1H NMR 和/或反相 HPLC 在稀溶液中的分离所示。室内温度。顺式/反式异构化的程度和相对速率由原位激光(λ = 405 nm)诱导的顺式-[Pd(L2-S,O)2] 直接通过 1H NMR 和 195Pt NMR 光谱法监测。 [Pt(LS,O)2]化合物在氯仿-d中;有和没有光照射都允许记录 δ(195Pt) 化学位移顺式/反式异构体对。顺式/反式异构体似乎处于热力学有利的顺式异构体与其反式对应物之间的光热平衡中。在黑暗中,反式异构体在可能是热过程中恢复