Abstract
The effect on the vibrational spectrum of the hydroxy groups in dioctahedral 2:1 phyllosilicates of the isomorphous cation substitution of Mg2+ by Al3+ in the octahedral sheet was investigated at the DFT level. Ortho, meta and para Mg2+ configurational polymorphs were defined. The theoretical vibration frequencies of OH groups depend significantly on the nature of the cations they are joined with. Theoretical values are spread out over narrow ranges: 3,612–3,626 cm−1 for ν(AlOHMg), 3,604–3,606 cm−1 for ν(AlOHAl), and 3,657–3,660 cm−1 for ν(MgOHMg); 803–830 cm−1 for δ(AlOHMg), 877 cm−1 for δ(AlOHAl), and 693–711 cm−1 for δ(MgOHMg), in agreement with known experimental values. From the intensities of the XOHY bands, we observe that the vibrational adsorptivities of the ν(OH) vibrations are not the same for all XOHY groups, and that ν(MgOHMg) absorptivity is much lower than that of ν(AlOHAl). These theoretical results should be taken into account in quantitative analysis of experimental vibrational studies in clay minerals, introducing different molar extinction coefficients in the Lambert-Beer law to determine the relative concentrations of both cationic arrangements.
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Acknowledgments
The authors are grateful to D. Fernández for fruitful discussions, to the exchange program of the Royal Society (UK), and BTE2002-03838, CGL2008-02850/BTE and CTQ2004-04648 MCYT projects, to European Union–Le Fonds Européen de Développement Régional (EU FEDER) funds for financial support and to Centro Técnico de Informática of Consejo Superior de Investigaciones Científicas (CSIC) and the Computational Center of the University of Granada for computing facilities. N.H.-H. is thankful to CSIC for a PhD scholarship providing financial support.
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Hernández-Haro, N., Ortega-Castro, J., Pruneda, M. et al. Theoretical study on the influence of the Mg2+ and Al3+ octahedral cations on the vibrational spectra of the hydroxy groups of dioctahedral 2:1 phyllosilicate models. J Mol Model 20, 2402 (2014). https://doi.org/10.1007/s00894-014-2402-6
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DOI: https://doi.org/10.1007/s00894-014-2402-6