Journal
JOURNAL OF CHEMICAL PHYSICS
Volume 144, Issue 8, Pages -Publisher
AIP Publishing
DOI: 10.1063/1.4942027
Keywords
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Funding
- Portuguese Fundacao para a Ciencia e a Tecnologia (FCT) [SFRH/BPD/77276/2011, Pest-OE/QUI/UI0313/2014]
- Academy of Finland through Project KUMURA [1277993]
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Non-covalent interaction of acetic acid (AA) and water is studied experimentally by IR spectroscopy in a nitrogen matrix and theoretically at the MP2 and coupled-cluster with single and double and perturbative triple excitations [CCSD(T)]/6-311++ G(2d,2p) levels of theory. This work is focused on the first preparation and characterization of complexes of higher-energy (cis) conformer of AA with water. The calculations show three 1:1 structures for the trans-AA center dot center dot center dot H2O complexes and three 1:1 structures for the cis-AA center dot center dot center dot H2O complexes. Two trans-AA center dot center dot center dot H2O and two cis-AA center dot center dot center dot H2O complexes are found and structurally assigned in the experiments. The two cis-AA center dot center dot center dot H2O complexes are obtained by annealing of a matrix containing water and cis-AA molecules prepared by selective vibrational excitation of the ground-state trans form. The less stable trans-AA center dot center dot center dot H2O complex is obtained by vibrational excitation of the less stable cis-AA center dot center dot center dot H2O complex. In addition, the 1:2 complexes of trans-AA and cis-AA with water molecules are studied computationally and the most stable forms of the 1:2 complexes are experimentally identified. (C) 2016 AIP Publishing LLC.
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