Add time:07/28/2019         Source:sciencedirect.com

The molecular structures of 1,1-dimethylsilacyclobutane (DMSICB) and 1,1,3,3-TETRAMETHYL-1,3-DISILACYCLOBUTANE (cas 1627-98-1) (TMDSICB) have been studied by gas-phase electron diffraction at room temperature. Both molecules exist in a puckered conformation. The major geometrical parameters obtained are as follows: for DMSICB, r(CH) = 1.117(4) Å, r(CC) = 1.565(4) Å, r(SiC) av = 1.880(2) Å, Delt(SiC) = [r(SiC) — r(SiCm)] = 0.004(15) Å, ∠CSiC = 76.6(0.8)°, ∠CmSiCm = 113(2)°, ∠HCSi = 113.5(1.6)°, ∠HCH = 111(4)°, and Flap [angle between the planes formed by atoms C1,Si,C3 and C1,C2,C3, where planar = 0°] = 34.2(3.0)°; for TMDSICB, r(CH) = 1.080(5) Å, r(SiC)av = 1.884(2) Å, Delt(SiC) = 0.017(3) Å, ∠CSiC = 90.1(6)°, ∠CmSiCm = 117.4(2.6)°, ∠HCSi =112.5(1.7)°, and Flap = 22.1(2.2)°.

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