Solid state effects in the IR spectrum of Octahydridosilasesquioxane

Infrared spectrum of Octahydridosilasesquioxane, in the solid state, is reported and analyzed to show the presence of significant solid state effects. This is in marked contrast with the reported Raman spectroscopic studies of this compound in the solid state where no evidence for such a proliferation of these effects were found. It is found that the normal modes with radial motion of the atoms in their normal coordinate are distinguishable from other vibrations by the distinct correlations between the band intensity and the solid state splitting observed in the IR spectrum. This new insight suggests an interchange of the literature assignments of the two modes v(27) and v(29) in the IR spectrum and a different origin to the doublet of bands in the Raman spectrum at 883 and 897 cm(-1). (C) 2003 Elsevier B.V. All rights reserved.