Ab initio investigation of benzene clusters: Molecular Tailoring Approach

Subha Mahadevi, A. ; Rahalkar, Anuja P. ; Gadre, Shridhar R. ; Narahari Sastry, G. (2010) Ab initio investigation of benzene clusters: Molecular Tailoring Approach The Journal of Chemical Physics, 133 (16). 164308_1-164308_12. ISSN 0021-9606

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Official URL: http://jcp.aip.org/resource/1/jcpsa6/v133/i16/p164...

Related URL: http://dx.doi.org/10.1063/1.3494536


An exhaustive study on the clusters of benzene (Bz)n, n = 2-8, at MP2/6-31++G level of theory is reported. The relative strengths of CH-π and π -π interactions in these aggregates are examined, which eventually govern the pattern of cluster formation. A linear scaling method, viz., molecular tailoring approach (MTA), is efficiently employed for studying the energetics and growth patterns of benzene clusters consisting up to eight benzene (Bz) units. Accuracy of MTA-based calculations is appraised by performing the corresponding standard calculations wherever possible, i.e., up to tetramers. For benzene tetramers, the error introduced in energy is of the order of 0.1 mH ( ~ 0.06 kcal/mol). Although for higher clusters the error may build up, further corrections based on many-body interaction energy analysis substantially reduce the error in the MTA-estimate. This is demonstrated for a prototypical case of benzene hexamer. A systematic way of building up a cluster of n monomers (n-mer) which employs molecular electrostatic potential of an (n-1)-mer is illustrated. The trends obtained using MTA method are essentially identical to those of the standard methods in terms of structure and energy. In summary, this study clearly brings out the possibility of effecting such large calculations, which are not possible conventionally, by the use of MTA without a significant loss of accuracy.

Item Type:Article
Source:Copyright of this article belongs to American Institute of Physics.
Keywords:Ab Initio Calculations; Molecular Clusters; Organic Compounds; Perturbation Theory; Potential Energy Functions
ID Code:86960
Deposited On:14 Mar 2012 08:05
Last Modified:14 Mar 2012 08:05

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