Vibrational spectra and normal coordinate analysis of silyl pseudohalides. Part 2.—Silyl isoselenocyanate

Abstract

We have measured band positions for eight of the fundamental vibrations of SiH₃¹⁴N¹²CSe, SiH₃¹⁵N¹²CSe, SiH₃¹⁴N¹³CSe and SiD₃¹⁴N¹²CSe in argon and nitrogen matrices and have used the frequencies and isotope shifts to help define a harmonic force field. The other modes, both low-frequency skeletal bends, have been identified from gas-phase spectra. The infrared spectra, and the agreement between observed and calculated values of D_JK, confirm that the molecular skeleton is linear in the matrix as in the gas phase and that the lowest-frequency bend (at nitrogen) is essentially harmonic.