Neutral Mono-and Bidentate Nitrogen Bases

Bidentate ionic ligands with oxygen and nitrogen as donor atoms 

Bidentate ligands forming four-membered rings with silicon 

Bidentate ligands derived from carboxylic acids 

These classes of silicon complexes will be discussed in the following sections. 

The reaction conditions for the synthesis of [Si2(pz )g] and [Si(pz )4] have been investigated in detail in order to obtain suitable precursor compoxmds for the synthesis of the hitherto unknown Janus-head ligand tris(3,5-dimethylpyrazolyl) silanide ([Si(pz )3] [241]. The X-ray stmctures of several pentacoordinated disilanes of type 95 with X = Cl or 3,5-dimethylpyrazolyl have been presented in this work. The chemistry of 3,5-dimethylpyrazolyl silicon complexes has been further explored. Although pyrazolide is an anionic substituent, its second N atom (the imine N atom of N-silylated pyrazole) also coordinates to silicon, thus exhibiting features of a neutral nitrogen donor as well. 

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