期刊
SPECTROCHIMICA ACTA PART A-MOLECULAR AND BIOMOLECULAR SPECTROSCOPY
卷 97, 期 -, 页码 600-605出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.saa.2012.07.017
关键词
Halogen bond; Dimethylsulfoxide; Dihalogen; Blue shift; Red shift
类别
资金
- National Natural Science Foundation of China [20973149]
- Outstanding Youth Natural Science Foundation of Shandong Province [JQ201006]
- Program for New Century Excellent Talents in University
- sate key laboratory of supramolecular structure and materials from Jilin University, China [SKLSSM201216]
The DMSO-XY (XY = ClF and BrF) complexes have been investigated with quantum chemical calculations. In general, two minima complexes were found, one with an O center dot center dot center dot X halogen bond and the other one with a S-X halogen bond. The former is more stable than the latter. Additionally, one first order saddle point complex was also observed. The interaction energies in the S complexes suffer a prominent influence from the calculation methods. At the CCSD(T)/aug-cc-pVDZ level, the interaction energies are calculated to be -9.19 and -12.73 kcal/mol for the Cl and Br global minima, respectively. Both complexes have also been evidenced to be stable at room temperature. The S=O stretch vibration exhibits a red shift at the global minimum but a blue shift at the local minimum, whereas the CSC and CH stretch vibrations move to high frequency in both cases. The energy decomposition analyses indicate that the electrostatic interaction plays a dominant role in stabilizing these halogen-bonded complexes. (C) 2012 Elsevier B.V. All rights reserved.
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