An NMR study on the association stabilities of thiaheterohelicenes against 7,7,8,8-tetracyanoquinodimethan. Effect of the staggered configuration of helicene.
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概要
- 論文の詳細を見る
In order to evaluate the influence of the staggered configuration of helicene on complex formation, a <SUP>1</SUP>H NMR technique was applied to the complexing equilibria of thiaheterohelicene homologs with 7,7,8,8-tetracyanoquinodimethan (TCNQ). Formation constants of the complexes showed irregular changes in the case of [5] and [7]thiaheterohelicenes in which the staggerings occur. This irregularity could be interpreted on the basis of the observed abnormal decrease of the bonding entropy. The reduced bonding entropy was understood in terms of the incomplete quenching of internal freedom, which was expected from the peculiar orientation of the staggered thiaheterohelicene towards planar TCNQ, in the charge-transfer complex.
- 公益社団法人 日本化学会の論文
著者
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NAKAGAWA Hiroko
Faculty of Pharmaceutical Sciences, Josai University
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Yamada Koh-ichi
Faculty Of Pharmaceutical Sciences Josai University
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Kawazura Hiroshi
Faculty Of Pharmaceutical Sciences Josai University
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Tanaka Hisao
Faculty Of Pharmaceutical Sciences Josai University
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Nakagawa Hiroko
Faculty of Pharmaceutical Science, Josai University
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