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2 citations found for Fenimore, P.
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A wide variety of neutron scattering techniques can be applied to obtain information on the structure and dynamics of biological systems on multiple scales. Recent progress is summarized, as are hoped-for future developments in the context of the advent of next-generation neutron sources on various continents.
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Dibiphenylene-ethylene crystallizes in the space group Pcan. The data for the unit cell are: a = 17.2, b = 36.9, c = 8.23 A., Z = 12. The strong negative birefringence and marked pleochroism indicate a layer crystal structure, and the morphology suggests an arrangement of molecules compatible with optical data and supported by Fourier syntheses. Satisfactory agreement of calculated with observed structure amplitudes is obtained with a centrosymmetric, planar molecular model constructed on customary C-C distances and angles. The anomalous reactivity and color of dibiphenylene-ethylene are discussed as steric effects of molecular planarity.