
Journal of Organometallic Chemistry p. 55 - 68 (1984)
Update date:2022-08-05
Topics:
Maltsev, A. K.
Khabashesku, V. N.
Nefedov, O. M.
As a continuation of studies on Si=C bond species, the silaethenes (CH3)2Si=CD2 and (CD3)2Si=CD2 have been generated by vacuum pyrolysis of the corresponding silacyclobutanes with totally deuterated rings.The silaethenes are stabilized in argon matrices at 12 K and characterized by IR spectroscopy.The following vibrational bands of the silaethenes have been revealed by using warm-up experiments (to 40K) and through variations of the pyrolysis conditions: (CH3)2Si=CD2 508.0, 535.3, 617.1, 776.5, 819.8, 895.1, 1117.5, 1251.0, 1259.5 cm-1; (CD3)2Si=CD2 501.6, 651.2, 732.0, 866.5, 1002.5, 1005.0, 1028.0, 1112.0 cm-1.A comparison of these values with computed vibrational frequencies of the silaethenes indicates that the ν(Si=C) vibration corresponds to two bands in the spectrum of each silaethene, namely 895.1 and 1117.5 cm-1 for (CH3)2Si=CD2, 866.5 and 1112.0 cm-1 for (CD3)2Si=CD2.Within each pair, the band with the higher wave number corresponds to a larger contribution by ν(Si=C).
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