Binuclear hexacoordinate silicon chelates

Binuclear silicon chelates (55a,c,g,j) were prepared from 1,2-bis(trichloro-silyl)ethane and Af-dimethylamino-O-trimethylsilylimidates (la,c,g,j) in high yields.69 The hexacoordination of these complexes is evident from a crystal structure analysis obtained for 55c (Fig. 23), as well as from their... 

Binuclear Ethylene-Bridged Silicon Chelates Equilibrium between Neutral Hexacoordinate and Ionic Pentacoordinate Siliconium Complexes... 

In search for new oligomers and polymers containing hypervalent silicon chelates, the reactions of bis(trichlorosilyl)ethane (1) with O- and N-trimethylsilylated hydrazides (2 and 3, respectively) have been studied. The reaction of 1 with 3 was reported to lead to ionic binuclear disiliconium dichloride salts (4, Eq. 1) [1]. It was not obvious how the reaction of 2 with 1 might proceed would it form a neutral binuclear hexacoordinate complex, like the mononuclear analogues [2], or would it form ionic complexes, in analogy to 4 ... 

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