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Ab initio investigation of benzene clusters: molecular tailoring approach.
MedLine Citation:
PMID:  21033789     Owner:  NLM     Status:  In-Process    
Abstract/OtherAbstract:
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.
Authors:
A Subha Mahadevi; Anuja P Rahalkar; Shridhar R Gadre; G Narahari Sastry
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Publication Detail:
Type:  Journal Article    
Journal Detail:
Title:  The Journal of chemical physics     Volume:  133     ISSN:  1089-7690     ISO Abbreviation:  J Chem Phys     Publication Date:  2010 Oct 
Date Detail:
Created Date:  2010-11-01     Completed Date:  -     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  0375360     Medline TA:  J Chem Phys     Country:  United States    
Other Details:
Languages:  eng     Pagination:  164308     Citation Subset:  -    
Affiliation:
Molecular Modeling Group, Indian Institute of Chemical Technology, Hyderabad 500 607, India.
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