The molecular and crystal structure of polytetrahydrofuran has been determined by X-ray diffraction analysis. The unit cell dimensions are a -5.48, b = 8.73, c (fiber axis) = 12.07 A., and p = 134.2". The space group is C2/c -C2: . Two molecular chains pass through the unit cell. The skeleton of the molecular chain has a planar zig-zag conformation and the zig-zag plane is parallel to the (100)-plane.The infrared dichroism and pleochroism were measured, and the tentative assignments for the infrared absorption bands were given and discussed.
ZUSAMMENFASSUNG:Molekulare Struktur und Kristallstruktur von Polytetrahydrofuran wurden durch eine Rontgenbeugungsanalyse bestimmt. Die Elementarzelle besitzt die Abmessungen a = 5,48, b = 8,73, c (Faserachse) = 12,07 a und p = 134,2". Die Raumgruppe ist C2/c-C& Zwei Molekulketten durchlaufen die Elementarzelle. Die Ketten liegen in einer ebenen Zick-zack-Konformation vor; die dadurch definierte Ebene fallt mit der kristallographischen (100)-Ebene zusammen.Der Infrarot-Dichroismus und -Pleochroismus wurden gemessen und eine versuchsweise Zuordnung der Absorptionsbanden angegeben und diskutiert.
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