The phase transition of 1,4-dialkyl-1,4-diazoniabicyclo(2.2.2)octane dibromides, Cn-DABCO-Cn+2-Br.
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The phase transition of 1,4-dialkyl-1,4-diazoniabicyclo[2.2.2]octane dibromide (diquaternary salt) in which the difference in the carbon numbers of the two alkyl groups is two, was studied by means of differential scanning calorimetry, infrared absorption spectroscopy, and a study of the bromide-anion conductivities. DSC measurements revealed the existence of the metastable phase. The conversion rate from the metastable phase to the stable phase was too slow to be followed. The phase transition could be explained by the free energy-temperature relation. The temperature-dependence of the infrared absorption spectra showed that the band progressions due to two different alkyl chains disappeared at the transition temperature. This shows that the <I>trans</I>-zigzag conformation in the low-temperature phase is destroyed by the conformational change of the alkyl chain at the transition temperature. The free energy-temperature relation was also confirmed by the IR spectra. Discontinuous increases in the bromide-anion conductivities were observed at the transition temperatures. The conductivity jump was explained by the voids caused by the conformational change in the alkyl chain.
- 公益社団法人 日本化学会の論文
著者
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Shimizu Jun
Department Of Clinical Dietetics And Human Nutrition Faculty Of Pharmaceutical Sciences Josai Univer
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Nogami Takashi
Department of Applied Chemistry, Faculty of Engineering, Osaka University
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Imamura Kengo
Department of Applied Chemistry, Faculty of Engineering, Osaka University
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