ポリビニルクラウンエーテルの溶液物性 : III.クラウンエーテルの分子形態

概要

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Dipole moment measurements and molecular mechanics calculations were performed to investigate the conformations of crown ethers. The crown ethers used in the study were as follows, 15-crown-5(15C5), benzo-15-crown-5(B15C5), 18-crown-6(18C6), benzo-18-crown-6(B18C6), dibenzo-18-crown-6(DB18C6) and cis-dicyclohexano-18-crown-6(DC18C6). The dipole moments μ measured in toluene over the temperature range from 25 to 50℃. The results at 35℃ were 3.037D (15C5), 2.720D (B15C5), 2.653D (18C6), 2.684D (B18C6), 2.355D (DB18C6) and 2.651 D (DC18C6), which showed that the μ values for the crown ethers having the odd numbers of oxygen atoms in the ether rings such as 15C5 were larger than μ's for the crown ethers with even numbers as 18C6 and the μ. values for the DB18C6 were very small. The μ values computed by the molecular mechanics calculations for the crown ethers were compatible with the experimental results. Using these results, we also discussed the conformations of poly(vinylcrown ether)s.
東京女子大学の論文
2002-03-07