Structure, Stabilities, Thermodynamic Properties, and IR Spectra of Acetylene Clusters (C2H2)(n=2-5)
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SCOPUS
- Title
- Structure, Stabilities, Thermodynamic Properties, and IR Spectra of Acetylene Clusters (C2H2)(n=2-5)
- Authors
- Karthikeyan, S; Lee, HM; Kim, KS
- Date Issued
- 2010-10
- Publisher
- AMER CHEMICAL SOC
- Abstract
- There are no clear conclusions over the structures of the acetylene clusters. In this regard, we have carried out high-level calculations for acetylene clusters (C2H2)(2-5) using dispersion-corrected density functional theory (DFT-D), Moller-Plesset second-order perturbation theory (MP2); and coupled-cluster theory with single, double, and perturbative triple excitations [CCSD(T)] at the complete basis set limit. The lowest energy structure of the acetylene dimer has a T-shaped structure of C-2v symmetry, but it is nearly isoenergetic to the displaced stacked structure of C-2h symmetry. We find that the structure shows the quantum statistical distribution for configurations between the T-shaped and displaced stacked structures for which the average angle (vertical bar(0) over tilde vertical bar) between two acetylene molecules would be 53-78 degrees, close to the T-shaped structure. The trimer has a triangular structure of C-3h symmetry. The tetramer has two lowest energy isomers of S-4 and C-2h symmetry in zero-point energy (ZPE) uncorrected energy (Delta E-e) but one lowest energy isomer of C-2v symmetry in ZPE-corrected energy (Delta E-0). For the pentamer, the global minimum structure is C-1 symmetry with eight sets of T-type pi-H interactions and a set of pi-pi interactions. Our high-level ab initio calculations are consistent with available experimental data.
- Keywords
- PI-PI INTERACTIONS; POTENTIAL-ENERGY SURFACE; MECHANICAL PROBABILISTIC STRUCTURE; AB-INITIO CALCULATIONS; EDGE-TO-FACE; BENZENE DIMER; VIBRATIONAL FREQUENCIES; BASIS-SET; INTERMOLECULAR INTERACTIONS; AROMATIC INTERACTIONS
- URI
- https://oasis.postech.ac.kr/handle/2014.oak/25655
- DOI
- 10.1021/CT100323F
- ISSN
- 1549-9618
- Article Type
- Article
- Citation
- JOURNAL OF CHEMICAL THEORY AND COMPUTATION, vol. 6, no. 10, page. 3190 - 3197, 2010-10
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- There are no files associated with this item.
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