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Journal of Atomic, Molecular, and Optical Physics
Volume 2012 (2012), Article ID 754879, 8 pages
http://dx.doi.org/10.1155/2012/754879
Research Article

Theoretical Investigation of the Cooperativity in CH3CHO·2H2O, CH2FCHO·2H2O, and CH3CFO·2H2O Systems

1Department of Chemistry, North Eastern Hill University, Shillong 793022, India
2Department of Chemistry, University of Leuven, 200F Celestijnenlaan, Heverlee 3001, Belgium

Received 29 February 2012; Accepted 30 April 2012

Academic Editor: Joanna Sadlej

Copyright © 2012 Asit K. Chandra and Thérèse Zeegers-Huyskens. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

Abstract

The hydrogen bond interaction between CH3CHO, CH2FCHO, and CH3CFO and two water molecules is investigated at the B3LYP/6-311++G(d,p) level. The results are compared with the complexes involving the same carbonyl derivatives and one water molecule. The calculations involve the optimization of the structure, the harmonic vibrational frequencies, and relevant NBO (natural bond orbital) parameters such as the NBO charges, the occupation of antibonding orbitals, and intra- and intermolecular hyperconjugation energies. Two stable cyclic structures are predicted. The two structures are stabilized by C=OHO hydrogen bond. The A structures are further stabilized by CHO bond involving the CH3 (CH2F) group. This bond results in an elongation of the CH bond and red shift of the ν(CH) vibration. The B structures are stabilized by CHO interaction involving the aldehydic CH bond. The formation of this bond results in a marked contraction of the CH bond and blue shift of the ν(CH) vibration indicating the predominance of the lone pair effect in determining the CH distances. The total interaction energies range from −12.40 to −13.50 kcal mol−1. The cooperative energies calculated at the trimer geometry are comprised between −2.30 and −2.60 kcal mol−1.