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Ab initio and density functional theory (DFT) studies on triflic acid with water and protonated water clusters

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Abstract

The structure, stability and infrared spectral signatures of triflic acid (TA) with water clusters (Wn) and protonated water clusters (TAH+Wn, n = 1 − 6) were computed using DFT and MP2 methods. Our calculations show that a minimum of three water molecules are necessary to stabilize the dissociated zwitterionic form of TA. It can be seen from the results that there is no significant movement of protons in smaller (n = 1 and 2) and linear (n = 1 – 6) types of water clusters. Further, the geometries of TAWn clusters first form a neutral pair (NP) to contact ion pair (CIP), then form a solvent separated ion pair (SSIP) in a water hexamer. These findings reveal that proton transfer may take place through NP to CIP and then CIP to SSIP. The calculated binding energies (BEs) of ion pair clusters is always higher than that of NP clusters (i.e., more stable than the NP). Existing excess proton linear chain clusters transfer a proton to adjacent water molecules via a Grotthuss mechanism, whereas the same isomers in the branched motifs do not conduct protons. Examination of geometrical parameters and infrared frequencies reveals hydronium ion (H3O+ also called Eigen cation) formation in both TAWn and protonated TAWn clusters. The stability of Eigen water clusters is three times higher than that of other non-Eigen water clusters. Our study shows clearly that formation of ion pairs in TAWn and TAH+Wn clusters greatly favors proton transfer to neighboring water molecules and also enhances the stability of these complexes.

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Acknowledgements

This work is supported by DST India-European Union sponsored project (HYPOMAP 8/233482/2008) and the Council of Scientific and Industrial Research (CSIR), India. We also thank the CSIR-CLRI for high performance computing time.

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Authors and Affiliations

  1. Department of Chemistry and Research Institute, SRM University, Kattankulathur, 603203, Tamil Nadu, India

    M. Prakash

  2. Chemical Laboratory, CSIR-Central Leather Research Institute, Adyar, Chennai, 600 020, India

    M. Prakash & V. Subramanian

  3. Academy of Scientific and Innovative Research (AcSIR), CSIR-CLRI Campus, Chennai, 600 020, India

    V. Subramanian

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  1. M. Prakash
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Correspondence to V. Subramanian.

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Prakash, M., Subramanian, V. Ab initio and density functional theory (DFT) studies on triflic acid with water and protonated water clusters. J Mol Model 22, 293 (2016). https://doi.org/10.1007/s00894-016-3158-y

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