Neutral and Cationic Trimethylsilylmethyl Complexes of Indium

The trimethylsilylmethyl indium complex [In(CH2SiMe3)3] (1) was studied by single-crystal X-ray structure analysis at low temperature and shown to be weakly associated as dimeric units with a long indium−carbon bond in the bridges. The bis(trimethylsilylmethyl) cation [In(CH2SiMe3)2(THF)3][B(C6F5)4] (2) was prepared by protonolysis of the neutral complex [In(CH2SiMe3)3] with [NPhMe2H][B(C6F5)4] in THF. Crystal structure analysis revealed that mononuclear 2 adopts a square-pyramidal geometry.