A vibrational study of the nature of hydroxyl groups chemical bonding in two aluminium hydroxides

Abstract : Lengths, strengths and valences of OH bonds in the two aluminium hydroxides gibbsite and bayerite were determined on the basis of vibrational spectral data. The uncoupled OD stretching modes in the range 2400-2800 cm-1 were recorded by means of infrared diffuse reflectance, thereby avoiding effects of surface, vibrational coupling or particle shape. The assignment of the corresponding Raman spectra resulted in the determination of harmonic wavenumbers, force constants and anharmonicity coefficients of bulk OH groups in the two minerals. OH bond lengths deduced from these data varied from 0.964 Å to 0.975 Å in gibbsite and 0.962 Å to 0.973 Å in bayerite. These lengths appear to correspond to weak H-bonds contrary to previously recognized data from X-ray diffraction and neutron diffraction studies. Finally, bond valences were calculated on the basis of these new bond lengths and discussed as a function of crystallographic structures and the nature of hydrogen bonding in these two structures.
Type de document :
Article dans une revue
Spectrochimica Acta Part A: Molecular and Biomolecular Spectroscopy, Elsevier, 2009, 72 (5), pp.959-964. 〈 http://www.scopus.com/scopus/inward/record.url?eid=2-s2.0-58249127529&partnerID=40〉
Liste complète des métadonnées

https://hal.univ-lorraine.fr/hal-01342725
Contributeur : Marie-Camille Caumon <>
Soumis le : mercredi 6 juillet 2016 - 15:36:38
Dernière modification le : jeudi 24 mai 2018 - 10:32:01

Identifiants

  • HAL Id : hal-01342725, version 1

Collections

Citation

Marie-Camille Jodin-Caumon, Bernard Humbert, Nsoki Phambu, Fabien Gaboriaud. A vibrational study of the nature of hydroxyl groups chemical bonding in two aluminium hydroxides. Spectrochimica Acta Part A: Molecular and Biomolecular Spectroscopy, Elsevier, 2009, 72 (5), pp.959-964. 〈 http://www.scopus.com/scopus/inward/record.url?eid=2-s2.0-58249127529&partnerID=40〉. 〈hal-01342725〉

Partager

Métriques

Consultations de la notice

73