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https://hdl.handle.net/10316/8280
Title: | Para-halogenated benzaldehyde molecules included in cyclodextrins: a combined spectroscopic and thermal analysis | Authors: | Ribeiro-Claro, Paulo J. A. Costa, António M. Amorim da Vueba, Manuel L. Pina, M. Eugénia Amado, Ana M. |
Issue Date: | 2006 | Citation: | Journal of Raman Spectroscopy. 37:4 (2006) 472-479 | Abstract: | The inclusion complexes of 4-X-benzaldehyde guests (X = F, Cl, Br) in alpha-, beta-and gamma-cyclodextrins (alphaCD, betaCD and gammaCD) were prepared and characterized by means of thermogravimetry, differential scanning calorimetry (DSC) and vibrational spectroscopy. The stoichiometry of the inclusion complexes ranges from 2:1 to 1:2, depending on the cavity size of the host. Sensitive vibrational modes such as C-O and ring CH stretching modes were used to monitor the effects of the inclusion process and to assess the preferred inclusion geometry for each host-guest pair. On the whole, the spectral observations suggest that the small alphaCD cavity imposes important structural restrictions on the guest molecule, while the larger gammaCD cavity allows lsquoliquid-typersquo intermolecular contacts. Copyright © 2005 John Wiley & Sons, Ltd. | URI: | https://hdl.handle.net/10316/8280 | DOI: | 10.1002/jrs.1419 | Rights: | openAccess |
Appears in Collections: | FCTUC Química - Artigos em Revistas Internacionais |
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