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IJC-A Vol.49A(02) [February 2010] >


Title: A DFT and AIM study of the interactions of pyridine and pyrazine with alkali hydrides. Identification of dihydrogen bonds involving aromatic C-H hydrogen
Authors: Samanta, Amit K
Datta, Dipankar
Keywords: Theoretical chemistry
Density functional calculations
Atom-in-molecule analysis
Dihydrogen bonds
Bond critical point
Interaction energy
Ammonia borane dimer
Issue Date: Feb-2010
Publisher: CSIR
Abstract: The interactions of pyridine (py) and pyrazine (pz) with LiH, NaH and KH are studied by DFT at the B3LYP/6-311++g(2d,p) level. The interaction energies corrected for BSSE lie in the range −86.7 to −38.8 kJ mol-1. Dihydrogen bonds are observed only for the py-KH and pz-KH systems with distances 2.27 and 2.17 Å respectively. AIM analyses show presence of bond critical points, associated with an electron density of 0.011-0.013. Our calculations on the ammonia borane dimer, where presence of dihydrogen bond is authentic, at the same level of theory reveal that the electron density at the bond critical points of the dihydrogen bonds (of calculated lengths 2.03-2.05 Å) is 0.015.
Page(s): 176-179
ISSN: 0975-0975(Online); 0376-4710(Print)
Source:IJC-A Vol.49A(02) [February 2010]

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