Add time:07/22/2019 Source:sciencedirect.com
The structures of free Ph4M molecules (MSi, Ge, Sn) have been analysed by electron diffraction. Only a limited amount of reliable structural information could be determined since several models (D2d, S4, D2) fit the experimental data equally well. The phenyl rings are slightly elongated. Assuming that b = c and γ = 120°, the rg parameters (with estimated total errors) have been obtained: 1MC(CC)mean(CH)meanbaα(Å)(Å)(Å)(Å)(deg.)Ph4Si1.871(4)1.403(3)1.087(4)0.005(5)118.2(4)Ph4Ge1.960(4)1.401(3)1.098(4)−0.012(6)119.5(3)Ph4Sn2.137(5)1.401(3)1.109(5)−0.037(8)119.5(6) where a=r (C1-C2), b=r(C2-C3), c=r(C3-C4) α = ∠ C6-C1-C2, and γ = ∠ C2-C3-C4.
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