Journal
JOURNAL OF PHYSICAL CHEMISTRY A
Volume 113, Issue 5, Pages 878-886Publisher
AMER CHEMICAL SOC
DOI: 10.1021/jp809062x
Keywords
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Funding
- National Science Foundation [CHE0715268]
- American Chemical Society Petroleum Research Fund [44262-AC6]
- NSF CRIF award [CHE 04-43564]
- Georgia Tech
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Heteroatoms are found in many noncovalent complexes which are of biological importance. The effect of heteroatoms on pi-pi. interactions is assessed via highly accurate quantum chemical computations for the two simplest cases of interactions between aromatic molecules containing heteroatoms, namely, benzene-pyridine and pyridine dimer. Benchmark quality estimated coupled-cluster through perturbative triples [CCSD(T)] binding energies are computed near the complete basis set limit. Comparisons to the benzene dinner are made to determine the contributions from heteroatoms. The presence of a heteroatom reduces the spatial extent of the pi-electron cloud and polarizability of pyridine as compared to benzene. As a result, the magnitude of the dispersion, exchange, and induction interactions in benzene-pyridine and pyridine dimer is generally reduced as compared to those for the benzene dimer. Benzene-pyridine and pyridine dinner bind more strongly than the benzene dither in several configurations, and in contrast to the benzene dither, parallel-displaced configurations can be significantly preferred over T-shaped configurations. Hydrogens para to a heteroatom are more effective pi-hydrogen bond donors, but aromatic rings with heteroatoms are worse pi-hydrogen bond acceptors.
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