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- W2034656879 abstract "The structure of poly (di-n-hexyl germane) has been investigated using X-ray and conformational energy analysis. Wide-angle X-ray diffraction analysis shows that the polymer undergoes an order/disorder transition at about 15°C. The polymer is known to exhibit thermochromism associated with this phase transition. Below the transition temperature, the backbone conformation is all-trans and the molecules are arranged in an orthorhombic unit cell. Above the transition temperature, the backbone disorders and the polymer loses long-range ordering. Fixed bonding conformational energy calculations found the lowest energy structure to be a 73 helix, very similar to that found for poly(di-n-hexyl silane). Most probably, the observed all-trans backbone conformation is due to intermolecular interactions which force the germanium backbone to an all-trans conformation. In order to carry out the molecular mechanics calculations, non-bonded energy parameters for germanium atoms were derived." @default.
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- W2034656879 date "1992-01-01" @default.
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- W2034656879 title "The low-temperature structure of poly(di-n-hexyl germane)" @default.
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- W2034656879 doi "https://doi.org/10.1016/0032-3861(92)90791-t" @default.
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