a crucial conformational change of the six-membered chelate ring from a stable chair conformation to a twist-boat structure, which concomitantly reduced reactivity of the isocyanide ligand toward nucleophilic attack of the amine by steric hindrance of meso-dpmppm pincer ligand. These results could be recognized as on/off switching of the asymmetric PtII(meso-dpmppm−κ3)} pincer complex.
[
氯铂酸的反应2(COD)]与tetraphosphine内消旋-双[(
二苯基膦基苯基)
苯基膦]
甲烷(内消旋-dpmppm),得到单核的
PT II络合物,[
氯铂酸(内消旋-dpmppm-κ 3)] X(X =
氯(1a),PF 6(1b));的内消旋-dpmppm
配体的坐标提供给
PT II紧密两个外和一个内
磷原子离子,以形成稠合的六元和四元被视为不对称螯合环PPP钳形
配体轴承的uncoordinate内膦单元。综合大楼1容易与RNC在NH存在下反应4 PF 6,得到[
铂(内消旋-dpmppm-κ 3)(RNC)](PF 6)2(R =的Xyl(图2a)中,Cy(图2b),吨卜(2C))。当图2a和2b中,用过量的
苄胺(BnNH反应2),Ñ -acyclic卡宾络合物,[
PT(内消旋-dpmppm-κ 3)C(NHR)(NHBn)}](PF 6)2(R =的Xyl (3a),Cy(3c)),获得,和一个类似的处理的图2a与Ñ