CO释放体系中沉淀的预防及利用配体交换反应调控CO释放速率

Preventing CO⁃Releasing Systems from Forming Precipitates and Tuning CO⁃Releasing Rate via Ligand Exchange Reaction

采用3个含巯基基团的水溶性化合物(硫普罗宁、巯基乙胺和巯基甘油)来诱导二铁羰基化合物[Fe_(2)(μ-SCH_(2)CH(OH)CH_(2)(OH))_(2)(CO)_(6)](1)释放CO。为了解决在CO释放过程中形成沉淀的问题,研究了乙二胺四乙酸(EDTA)对分解产物的溶解作用。结果表明EDTA不仅可以成功地预防CO释放体系中沉淀的生成,还可以协同促进化合物1分解释放CO。虽然所选择的配体都含有巯基功能基团,但其对化合物1释放CO的促进作用不同,据此可用于CO释放速率的调控。

In this work,three water-soluble compounds(tiopronin,cysteamine,and mercaptoglycerol)which contain a thiol group have been used to initiate CO-release from a diiron hexacarbonyl complex[Fe_(2)(μ-SCH_(2)CH(OH)CH_(2)(OH))_(2)(CO)_(6)](1).To overcome forming precipitates during the CO-releasing process,we investigated using ethylenediaminetetraacetic acid(EDTA)as the agent to solubilize products derived from the decomposition.Our results suggest that EDTA not only successfully prevents the CO-releasing system from forming precipitates,but also synergistically facilitates the CO-release from complex 1.Despite the fact that the chosen ligands possess a thiol functional group,their behaviors in promoting the CO-release from complex 1 are rather different,which can be exploited to tune the CO-releasing rate in potential applications.