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Structures of a dimorphic pentacoordinate silicon complex

Acta Cryst. (2007). C63, o613-o616 [doi:10.1107/S0108270107045465)]

[Formation of dimorphs]
The existence of polymorphs is of importance for many applications that depend on the solid state properties of a compound. TBPY-5-34-(Butane-1,4-diyl)(2-{[1-(2-oxidophenyl)ethylidene-κO]amino-κN}ethanolato-κO)silicon, C14H19NO2Si, crystallizes in two modifications. The monoclinic form, (IIm), was obtained by crystallization over a period of 2 days at room temperature; the orthorhombic form, (IIo), crystallized overnight at 248 K. According to thermal analysis it was concluded that (IIm) is the thermodynamically stable modification and (IIo) is a kinetically formed modification.
U. Böhme and I.C. Foehn