Pentacoordinated Silicon Compounds with Coinage Metals Cu, Ag, Au

6 Pentacoordinated Silicon Compounds with Coinage Metals (Cu, Ag, Au) 

NMR shift of this compound ( 21.4 ppm) already indicates effects of an enhanced coordination number of silictm, as this shift is significantly upfield (A5 23 ppm) with respect to triphenylfluorosilane [370]. In a related phosphane-functionalized disilane (222), complexation of gold activates flie Si Si bond for oxidatimi to afford 223 [371]. In sharp contrast, the related complexatiOTi of Cu(I) leads to a metal-silicon interaction in 224 (Cu—Si separations 2.72 A) that has been interpreted as the Si-Si o-orbital acting as an electron pair donor towards Cu(I), and complexation of Ag(I) (225) leads to a compound with noticeably larger intermetallic separations (3.39 and 3.48 A) [372]. 

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