in 5 and 6 can be oxidized by either 2 equiv of [Cp2Fe][PF6] or an equimolar amount of I2 to afford Mo(II)2M(II)2 complexes, [Mo2M2(X)2(tBuNC)4(pyphos)4]2+ in which two Mo-M(II) single bonds are formed and the bond order of the Mo-Mo moiety has been decreased to three. The Ir(I) complex 5a reacted not only with methyl iodide but also with dichloromethane to afford the 1,4-oxidative addition products
Mo2(pyphos)4(1)与[MCl(CO)2] 2(M = Ir和Rh)反应,得到式为Mo2M2(CO)2(Cl)2(pyphos)4(2,M = Ir; 3,M = Rh)。X射线衍射研究证实,两个“ MCl(CO)”片段以1的形式引入Mo2核的两个轴向位点,并由两个PPh2基团以反式方式进行配位,从而在每个M(I )
金属。用过量的tBuNC和XylNC处理2和3会诱导羰基和
氯化物
配体解离,从而生成相应的双键络合物[Mo2M2(pyphos)4(tBuNC)4](Cl)2(5a,M = Ir; 6a ,M = Rh)和[Mo 2 M 2(pyphos)4(XylNC)4](Cl)2(7,M = Ir; 8,M = Rh)。通过光谱数据和BPh4衍
生物[Mo2M2(pyphos)4(tBuNC)4](BPh4)2(5b,M = Ir;在图6c中,M = Rh),这证实了M(I)原子