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The hydrogen bonded and van der Waals isomers of pyrroleÃ‚Â·Ã‚Â·Ã‚Â·nitrogen and pyrroleÃ‚Â·Ã‚Â·Ã‚Â·carbon monoxide have been studied using ab initio and density functional theory methods. Complex geometries and total energies of the isomers have been determined at HF, MP2, B3LYP and B3PW91 levels of theory employing 6-31G* basis set. For pyrroleÃ‚Â·Ã‚Â·Ã‚Â·nitrogen complex, only two isomers have stable structure and the more stable one is found to be the hydrogen bonded isomer. Among the five isomers of pyrroleÃ‚Â·Ã‚Â·Ã‚Â·carbon monoxide complex, the hydrogen bonded isomer is found to be the most stable form. The interaction energy for all these isomers have been calculated after eliminating the basis set superposition errors by using the full counterpoise correction method. Chemical hardness, chemical potential have been calculated and are used to study the stability of the molecules

Post Hartree–Fock and DFT Studies on Pyrrole···Nitrogen and Pyrrole···Carbon Monoxide Molecules