VIBRATIONAL SPECTRA AND THE UNEXPECTED STRUCTURES OF SILICON AND GERMANIUM TETRA-ISO-CYANATES

Abstract

“Infrared and Raman spectra of liquid $Si(NCO)_{4}$ and $Ge(NCO)_{4}$ have been obtained. They are surprisingly simple. The results for $Si(NCO)_{4}$ indicate a tetrahedral molecule, which was completely unexpected. This is the first evidence for a linear arrangement of $M - N = C = O$ so far as we know. Although the spectrum of $Ge(NCO)_{4}$ is also simple, it seems quite clear that it does not have the same structure as $Si(NCO)_{4}$.”