Ab initio and DFT studies on methanol−water clusters

Mandal, Abhishek ; Prakash, Muthuramalingam ; Kumar, Ravva Mahesh ; Parthasarathi, Ramakrishnan ; Subramanian, Venkatesan (2010) Ab initio and DFT studies on methanol−water clusters The Journal of Physical Chemistry A, 114 (6). pp. 2250-2258. ISSN 1089-5639

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Official URL: http://pubs.acs.org/doi/abs/10.1021/jp909397z

Related URL: http://dx.doi.org/10.1021/jp909397z

Abstract

The gas-phase geometries, binding energies (BEs), vibrational spectra, and electron density topological features of methanol (M), water (W), and methanol−water mixed clusters (MmWn, where m = 0−4 and n = 0−4; m + n ≤ 4) have been calculated using Hartree−Fock, second-order Møller−Plesset perturbation, and density functional theory with Becke three-parameter hybrid functional combined with Lee−Yang−Parr correlation functional methods. Bader's "atoms in molecules" theory has been used to analyze the hydrogen bonding network. To understand the effect of cooperativity, we have performed natural bond orbital analysis and reduced variational space decomposition analysis. The results show that BEs of methanol and mixed clusters are higher than those of water clusters due to the electron-donating nature of the methyl group. These findings are in accordance with the role of cooperative polarization and cooperative charge transfer in the methanol and mixed clusters. As the size of the cluster increases, the contribution from the cooperative effects also increases. The cooperativity contributes ∼14 and 24% of stabilization in trimers and tetramers, respectively. The calculated νOH frequencies at MP2/6-311++G(d,p) are in close agreement with the corresponding experimental values.

Item Type:Article
Source:Copyright of this article belongs to American Chemical Society.
ID Code:107683
Deposited On:01 Dec 2017 12:30
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