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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.
DOI: 10.1002/jrs.1419
Rights: openAccess
Appears in Collections:FCTUC Química - Artigos em Revistas Internacionais

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