A diiron dithiolate complex 1o with a dithienylethene (DTE) phosphine ligand has been elaborately designed and fully investigated by spectroscopic and DFT computational studies. Upon irradiation with UV light, the DTE moiety in complex 1o undergoes an excellent photocyclization reaction to attain ring-closed state 1c in high yield (>95%), accompanied by a colour change from orange to deep blue. On the other hand, upon irradiation with visible light (>460 nm), ring-closed form 1c in CH3CN solution reverts perfectly into ring-open form 1o. Both 1o and 1c were characterised by IR, 1H, 31P, 19F NMR and electrochemical spectroscopy. The electrochemical behaviours of both the open and closed forms were investigated by cyclic voltammetry. Upon photocyclization reaction, a 290 mV (from −2.29 V to −2.00 V) positive shift is induced in the potential of electrochemical catalytic proton reduction, due to the electron-withdrawing effect of the ring-closed DTE moiety. Consequently, complex 1 can reversibly photoswitch the potential of proton reduction on the [FeFe] moiety.
带有二
噻吩乙烯 (DTE)
膦配体的二
硫醇二
铁配合物 1o 经过精心设计,并通过光谱和 DFT 计算研究进行了充分研究。在紫外光照射下,配合物 1o 中的 DTE 部分发生优异的光环化反应,以高产率 (>95%) 获得闭环态 1c,同时颜色从橙色变为深蓝色。另一方面,在可见光(>460 nm)照射下,CH3CN溶液中的闭环形式1c完美地恢复为开环形式1o。 1o和1c均通过IR、1H、31P、19F NMR和电
化学光谱进行了表征。通过循环伏安法研究了开放和封闭形式的电
化学行为。光环化反应时,由于闭环 DTE 部分的吸电子效应,电
化学催化质子还原电位会产生 290 mV(从 -2.29 V 到 -2.00 V)的正移。因此,配合物1可以可逆地光开关[FeFe]部分上的质子还原电位。