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- W1987177639 abstract "Abstract The structure of poly(di- n -propylsilylenemethylene) (PDPrSM) has been studied by X-ray diffraction, electron diffraction and molecular modeling. The fiber X-ray data and the electron diffraction pattern of single crystals show that PDPrSM has triclinic symmetry with unit cell parameters a=10.52 A , b=8.66 A , c=4.86 A , α =78.4°, β =100.0° and γ =98.2°. The fiber repeat, 4.86 A, indicates an all- gauche conformation in the main chain, giving a 4 1 helical structure. Ab initio and semi-empirical energy calculations show that with attachment of n -alkyl side chains an all- gauche conformation for the main chain gives the lowest energy. This is in contrast to the unsubstituted polymer, poly(silaethylene), which has a minimum energy for the all- trans conformation. The all- gauche conformation of the main chain of PDPrSM relieves the steric hindrance between side chains found in the all- trans conformation." @default.
- W1987177639 created "2016-06-24" @default.
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- W1987177639 date "2001-04-01" @default.
- W1987177639 modified "2023-09-23" @default.
- W1987177639 title "The structure of poly(di-n-propylsilylenemethylene)" @default.
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- W1987177639 doi "https://doi.org/10.1016/s0032-3861(00)00766-7" @default.
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