Abstract
Abstract Two-coordinate dialkylsilylene–coinage metal complexes 3+·TPFPB− (Cu) and 4+·TPFPB− (Ag) were synthesized as the first dialkylsilylene–copper complex and the first silylene–silver complex, respectively, by the reaction of dialkylsilylene 1 with the corresponding metal borate. X-ray analysis showed that both the complexes adopted a linear structure with two perpendicular dialkylsilylene units. Theoretical study indicated that weak π back-donation of the copper and silver complexes compared to that of the corresponding isoelectronic neutral palladium complex would be due to low-lying d orbitals of Cu+ and Ag+ centers and responsible for the linear structures.
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