The infrared and Raman spectra of 1,2-dichloroethane and its deuterium compound in the gaseous, liquid, and solid states have been remeasured in the wide range of wavelength by the experimental techniques developed recently. Normal coordinate treatments have been made for crystals as well as for free molecules by use of computer programs made by us, and all the vibrational frequencies observed for free molecules and crystals have been assigned satisfactorily. Our previous conclusions of the existence of the trans and gauche forms have been confirmed spectroscopically and, furthermore, supported theoretically by the quantum mechanical treatment of the internal rotation.
Hybrid inorganic–organic crystals containing α- and β-type octamolybdates (α-Mo8 and β-Mo8) were successfully prepared by using hexadecylpyridinium (C16py). Although both hybrid crystals consisted of alternate stacking patterns of monolayers of Mo8 anions and interdigitated bilayers of C16py cations, the Mo8 inorganic monolayers had different packing patterns between the hybrid C16py–α-Mo8 and C16py–β-Mo8 crystals. Each α-Mo8 was isolated by the inserted C16py cations, while β-Mo8 formed one-dimensional chains together with sodium cations.
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