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Hydrogen-Bond Relations for Surface OH Species
Uppsala universitet, Teknisk-naturvetenskapliga vetenskapsområdet, Kemiska sektionen, Institutionen för kemi - Ångström, Strukturkemi.ORCID-id: 0000-0003-3516-370X
Uppsala universitet, Teknisk-naturvetenskapliga vetenskapsområdet, Kemiska sektionen, Institutionen för kemi - Ångström, Strukturkemi.
Uppsala universitet, Teknisk-naturvetenskapliga vetenskapsområdet, Kemiska sektionen, Institutionen för kemi - Ångström, Strukturkemi.ORCID-id: 0000-0002-9842-4332
Uppsala universitet, Teknisk-naturvetenskapliga vetenskapsområdet, Kemiska sektionen, Institutionen för kemi - Ångström, Strukturkemi.ORCID-id: 0000-0003-3570-0050
Vise andre og tillknytning
2018 (engelsk)Inngår i: The Journal of Physical Chemistry C, ISSN 1932-7447, E-ISSN 1932-7455, Vol. 122, nr 9, s. 4849-4858Artikkel, omtale (Fagfellevurdert) Published
Abstract [en]

This paper concerns thin water films and their hydrogen-bond patterns on ionic surfaces. As far as we are aware, this is the first time H-bond correlations for surface water and hydroxide species are presented in the literature while hydrogen-bond relations in the solid state have been scrutinized for at least five decades. Our data set, which was derived using density functional theory, consists of 116 unique surface OH groups–intact water molecules as well as hydroxides–on MgO(001), CaO(001) and NaCl(001), covering the whole range from strong to weak to no H-bonds. The intact surface water molecules are found to always be redshifted with respect to the gas-phase water OH vibrational frequency, whereas the surface hydroxide groups are either redshifted (OsH) or blueshifted (OHf) compared to the gas-phase OH frequency. The surface H-bond relations are compared with the traditional relations for bulk crystals. We find that the “ν(OH) vs R(H···O)” correlation curve for surface water does not coincide with the solid state curve: it is redshifted by about 200 cm–1 or more. The intact water molecules and hydroxide groups on the ionic surfaces essentially follow the same H-bond correlation curve.

sted, utgiver, år, opplag, sider
Uppsala, 2018. Vol. 122, nr 9, s. 4849-4858
HSV kategori
Identifikatorer
URN: urn:nbn:se:uu:diva-347220DOI: 10.1021/acs.jpcc.7b10981ISI: 000427331300013OAI: oai:DiVA.org:uu-347220DiVA, id: diva2:1193834
Forskningsfinansiär
Swedish Research CouncilTilgjengelig fra: 2018-03-27 Laget: 2018-03-27 Sist oppdatert: 2019-02-19bibliografisk kontrollert
Inngår i avhandling
1. Water in and on ionic materials: Structure, energetics, and vibrations
Åpne denne publikasjonen i ny fane eller vindu >>Water in and on ionic materials: Structure, energetics, and vibrations
2018 (engelsk)Doktoravhandling, med artikler (Annet vitenskapelig)
Abstract [en]

Many chemical and physical phenomena in nature, in industrial processes, and in our daily lives take place at water/solid interfaces. The aim of this thesis is to further our knowledge of such processes at a molecular level. Here theoretical calculations can provide new insights about molecular bonding, structure and dynamics and how these respond to the perturbations from the surroundings. Coalculations can also yield for example vibrational spectra to be directly compared with experimental ones and help in the interpretation. This thesis describes the results of quantum-mechanical and quantum-dynamical studies of water properties on ionic surfaces [NaCl(001), MgO(001) and CaO(001)] and in ionic hydrates [e.g Na2CO3∙10H2O, MgSO4∙11H2O, Al(NO3)3∙9H2O] with especial emphases on surface and interface systems. In particular, calculations of binding energies, OH stretching frequencies, in situ electric field, dipole moments and intra/intermolecular OH distances were performed and analyzed to probe the strength of the water–environment interplay and to disentangle the components of the perturbation. Furthermore, validation of a range of dispersion-inclusive DFT methods for binding energies of interface water and structure and vibrational properties of water in condensed systems also constitutes part of the thesis.

Two correlations among the investigated properties were established and extensively explored: (i) OH stretching frequency vs. H-bond distance to characterize the H-bond strength and patterns on the surfaces and (ii) OH stretching frequency vs. local electric field to understand the effect of the water/hydroxide environment on the calculated gas-to-bound OH frequency shift behaviour. It was found that both the intact and dissociated water molecules on MgO(001) and CaO(001) follow essentially the same frequency-distance correlations. However, if the frequency is instead correlated against the in situ electric field from the environment, water and hydroxide ion follow different “frequency vs. field” curves. Both water and hydroxide curves, however, can be described by the same model, namely by an electrostatic dipole model presented in the thesis. The gas-to-surface frequency shifts can be traced back to the competition between the signs and magnitudes of the permanent and induced dipole derivatives along the stretching coordinate. Furthermore, the “frequency vs. field” model offers useful insights into the frequency shifts of various surface H-bond motifs on the H2O/MgO interface induced by the adsorption of multilayer cold water.

sted, utgiver, år, opplag, sider
Uppsala: Acta Universitatis Upsaliensis, 2018. s. 62
Serie
Digital Comprehensive Summaries of Uppsala Dissertations from the Faculty of Science and Technology, ISSN 1651-6214 ; 1654
Emneord
DFT, dispersion interactions, OH stretching frequency, electric field, dipole moment, Hydrogen bond, ionic surfaces, ionic hydrates
HSV kategori
Identifikatorer
urn:nbn:se:uu:diva-347225 (URN)978-91-513-0296-6 (ISBN)
Disputas
2018-05-18, Häggsalen, Ångströmlaboratoriet, Lägerhyddsvägen 1, Uppsala, 09:00 (engelsk)
Opponent
Veileder
Tilgjengelig fra: 2018-04-24 Laget: 2018-03-27 Sist oppdatert: 2018-10-08

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