Abstract
We have determined crystal structures of three pentacoordinated silicon compounds: 3-(trifluorosilyl)-2-cyanoethylpropionate (I), N-methyl-N-(trifluorosilylmethyl)acetamide (II), and N-methyl-N-(trifluorosilylmethyl)trifluoroacetamide (III). The coordination O→Si bond length is 2.729 and 2.668(5) in I (for two independent molecules), 1.879(1) in II, and 1.942(2) A in III. We concluded that mutual orientation of the carboxyl group and the =O→Si bond has a strong effect on the length of the latter. In the molecular packing of I, there is a structural motif of rows of close-packed SiF3 fragments.
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