本研究使用一個含磷硫多牙基的配位基Tris(3-(trimethylsilyl)2-mercaptophenyl)phosphine (P(STMS)3H3) 含磷硫多牙基的配位基，將其去質子化後與Fe(BF4)2和PPN(BF4) 在四氫呋喃與乙腈之混和溶劑下反應，可成功地合成出深綠色的二價鐵錯合物 [PPN][Fe(CH3CN)P(STMS)3] (1)。錯合物1的中心架構為二價鐵上鍵結了配位基的一個磷原子與三個硫原子，而形成雙三角錐的結構 (τ = 0.97)。將去質子化後的配位基P(STMS)33-和FeCl3與PPNCl反應後則可以得到棕色錯合物 [PPN][FeClP(STMS)3] (2)。而錯合物1中所鍵結的乙腈分子可以被外來的配位基所取代，錯合物1在室溫下與一氧化碳與PPNN3反應，可分別生成在空氣下穩定的紫色錯合物 [PPN][Fe(CO)P(STMS)3] (3)與棕色錯合物 [PPN][Fe(N3)P(STMS)3] (4)。錯合物1-4的生成可由紅外線光譜儀、紫外光-可見光光譜儀與X-ray單晶繞射儀鑑定。當錯合物1與氧氣反應時會形成深紫色的物種，在-80°C的低溫下，可由紫外光-可見光光譜儀偵測到該溶液在497 nm (ε = 2205 M-1cm-1)、561 nm (ε = 2284 M-1cm-1) 與659 nm (ε = 2807 M-1cm-1) 三個位置有電荷轉移吸收峰的生成。根據先前的文獻資料，我們推測錯合物1與氧氣在低溫反應後生成一種含氧的鐵中間體。

A tripodal tetradentate ligand, tris(3-(trimethylsilyl)-2- mercaptophenyl)phosphine (P(STMS)3H3) was prepared to synthesize several iron complexes. Addition of deprotonated P(STMS)33- to an acetonitrile solution of the mixture of equamolar iron tetrafluoroborate and PPN(BF4) gave an FeII complex, [PPN][Fe(CH3CN)P(STMS)3] (1). Complex 1 possesses a FeII center, coordinated by an apical phosphine, three equatorial thiolates and one acetonitrile, forming a trigonal bipyramidal geometry (τ = 0.97). Reaction of FeCl3, PPNCl and deprotonated P(STMS)33- provided an FeIII complex, [PPN][FeClP(STMS)3] (2). The bound acetoitrile of complex 1 is readily repleaced by an exogenous ligand. For instance, a purple complex [PPN][Fe(CO)P(STMS)3] (3) and a brown complex [PPN][Fe(N3)P(STMS)3] (4) were prepared from the reaction of complex 1 with CO and PPNN3, respectively. Complexes 1 – 4 were characterized by IR and UV/vis spectroscopies, and X-ray crystallography. As complex 1 reacted with dioxygen, a dark-purple species was formed, which was monitored by UV/vis spectroscopy at -80°C. The spectrum of the dark-purple species exhibited three charge transfer bands at 497, 561 and 659 nm (ε = 2205, 2284 and 2807 cm-1M-1), which were consistent with iron-oxygen species.

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