Inclusion of carvone enantiomers in cyclomaltoheptaose (beta-cyclodextrin): thermal behaviour and H -> D and D -> H exchange
authors da Silva, AMM; Empis, JMA; Teixeira-Dias, JJC
nationality International
journal CARBOHYDRATE RESEARCH
author keywords beta-cyclodextrin; carvone enantiomers; inclusion compounds; thermal dehydration; thermal guest release; H -> D/D -> H exchange
keywords REAL-TIME; DODECAHYDRATE; DYNAMICS
abstract The inclusion compounds of carvone enantiomers in cylcomaltoheptaose (beta-cyclodextrin, betaCD) are studied at defined temperatures above room temperature and in relation to H --> D and D --> H exchanges. Loss of water molecules and release of carvone molecules from the betaCD cavity are caused by increase of temperature above room temperature and are measured by the integrated intensities of the O-H and C-H Raman stretching bands, respectively. In turn, H --> D and D --> H exchanges are monitored by the integrated intensities of the O-H and O-D Raman stretching bands, respectively. All of these processes were followed in real time with a Raman spectrometer equipped with CCD detection. The results indicate that distinct carvone enantiomers lead to the formation of different betaCD inclusion hydrates that have different water content and hydration structures. In particular, the results suggest that SCarv-betaCD has a greater water content, dehydrates strongly for temperatures above room temperature, and exchanges protons faster than the RCarv-betaCD complex. (C) 2002 Elsevier Science Ltd. All rights reserved.
publisher ELSEVIER SCI LTD
issn 0008-6215
year published 2002
volume 337
issue 24
beginning page 2501
ending page 2504
digital object identifier (doi) 10.1016/S0008-6215(02)00314-2
web of science category Biochemistry & Molecular Biology; Chemistry, Applied; Chemistry, Organic
subject category Biochemistry & Molecular Biology; Chemistry
unique article identifier WOS:000179688900016
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