Crystalline Na–Si(NN) derivatives [Si(NN) = Si{(NCH2tBu)2C6H4-1,2}]: the silylenoid [Si(NN)OMe]−, the dianion [(NN)Si–Si(NN)]2−, and the radical anionc-[Si(NN)]3−

Abstract

Reactions of the silylene Si[(NCH₂Bu^t)₂C₆H₄-1,2], [Si(NN)], with NaOMe, excess Na or 1/3 Na yield the X-ray-characterised crystalline compounds [Na{μ-Si(NN)OMe}(THF)(OEt₂)]₂ (2b), [Na(THF)₂Si(NN)]₂ (3) and [Na(THF)₄][{Si(NN)}₃-c] (4).