Spectra Of Silane Research Articles

Fourier Transform Infrared Spectroscopic Study of Silane/Stone Interface

FT-IR spectroscopy was used to study the nature of the interface between silanes and stone. Methyltrimethoxysilane (MTMOS), 3-aminopropyltriethoxysilane (APS), and vinyltrimethoxysilane (VTS) were applied to three kinds of stone: limestone, sandstone and khondalite (a metamorphosed sandstone). Infrared spectra of silanes on the stone surfaces were obtained throughout the spectral region studied (4000–450 cm -1 ) by a digital subtraction technique and were compared with spectra of pure polymerized silanes. APS, VTS have been shown to interact with all three types of stone, however, interaction of MTMOS was observed only with sandstone and khondalite stone.

The Vibrational Spectra of Silane and Germane Derivatives. Part IV. The Infrared and Raman Spectra of the Iodo(methyl)germanes

The infrared and Raman spectra of the series of iodo(methyl)germanes, CH3GeI3, (CH3)2GeI2, and (CH3)3GeI have been recorded. A normal coordinate analysis based on a modified valence force field confirms the a priori assignments for all of the fundamental frequencies except the torsional modes.

The vibrational spectra of silane and germane derivatives. Part V. The infrared and Raman spectra of dihalogeno(methyl)germanes

The i.r. and Raman spectra of the series of dihalogeno(methyl)germanes, MeGeHX2(X = F, Cl, Br, I) and their specifically deuteriated analogues, MeGeDX2, are recorded. A normal co-ordinate treatment based on a modified valence force field confirms the assignment of 17 of the 18 fundamental frequencies for each molecule. The torsional mode is not observed. The transferability of the force constants between the protonated and deuteriated species is tested.

Proton magnetic resonance spectra of organic compounds with silicon and germanium and the relative ability of substituents for d? - p? interaction

1. An analysis of the chemical shifts in the proton magnetic resonance (PMR) spectra of (CH3)3MX (M=Si, Ge; X=F, OCH3, Br, C6H5), (CH3)4−nMCln, (C2H5)4−nMCln, and (C2H5)3MBr, corrected for the effects of magnetic anisotropy and the electric field of the substituent X, showed that the ability of X for dπ−pπ interaction with the atom M decreases in the series: F>OCH3>Cl>C6H5> Br. Silicon possesses greater ability for dπ−pπ interaction than germanium. 2. On the basis of a comparison of the results obtained with data on the IR spectra of silicon hydride, a hypothesis was advanced on the influence of hyperconjugation on the IR and PMR spectra of silanes.

Coriolis Perturbations in the Spectra of Silane and Germane

A Coriolis perturbation on the rotational structure of the fundamental frequency, v4 has been computed for silane and germane. Matrix elements of the Coriolis operator, A for the lines P(9), P(10) and Q(10) have also been obtained. The envelope of the resulting absorption curve has been compared with the experimental curve and good agreement found. The most striking difference in the two spectra is that in the case of silane, the Q branch degrades toward lower frequencies and in germane, towards higher frequencies. This is shown to be due to the relative position of the infra-red inactive frequency, v2 to which the perturbation is due.

The Infrared Absorption Spectrum of Silane

The spectrum of silane has been investigated to beyond 13.0\ensuremath{\mu}. Bands, enumerated in the order of their intensities, were located at 11.0\ensuremath{\mu} (910 ${\mathrm{cm}}^{\ensuremath{-}1}$), 4.6\ensuremath{\mu} (2183 ${\mathrm{cm}}^{\ensuremath{-}1}$), 3.17\ensuremath{\mu} (3153 ${\mathrm{cm}}^{\ensuremath{-}1}$), 3.23\ensuremath{\mu} (3095 ${\mathrm{cm}}^{\ensuremath{-}1}$), 5.5\ensuremath{\mu} (1820 ${\mathrm{cm}}^{\ensuremath{-}1}$) and 2.3\ensuremath{\mu} (4360 ${\mathrm{cm}}^{\ensuremath{-}1}$). Four of these regions have been investigated under higher dispersion and partially resolved. The spectrum appears quite similar, except for certain details, to that of methane and by analogy the above bands have been identified as ${\ensuremath{\nu}}_{4}$, ${\ensuremath{\nu}}_{3}$, ${\ensuremath{\nu}}_{1}+{\ensuremath{\nu}}_{4}$, ${\ensuremath{\nu}}_{3}+{\ensuremath{\nu}}_{4}$, $2{\ensuremath{\nu}}_{4}$ and $2{\ensuremath{\nu}}_{3}$. From these values one may determine ${\ensuremath{\nu}}_{1}$ which takes the value 2243 ${\mathrm{cm}}^{\ensuremath{-}1}$. By the methods developed by Dennison and Johnston one may determine the moment of inertia which from the most probable value for the spacing between lines takes the value ${I}_{0}=8.9\ifmmode\times\else\texttimes\fi{}{10}^{\ensuremath{-}40}$ g ${\mathrm{cm}}^{2}$.

The Infrared Absorption Spectrum of Silane

First Page