title: The performance of the new 6-31G(##) basis set: molecular structures and vibrational frequencies of transition metal carbonyls.
abstract: The performance of the newly proposed 6-31G(##) basis set for calculating the equilibrium structure and vibrational frequencies of transition metal carbonyl complexes has been studied at the HF and DFT levels of theory. The 6-31G(##) basis set has been constructed by augmentation of the 6-31G basis set by diffuse and polarization functions, which are generated from the corresponding 6-31G basis AOs response functions obtained in the frame of propagator approach. The predicted values of bond distances and vibrational frequencies for the title compounds are in good agreement with the experimental data. The relative energies and HOMO-LUMO gaps were also estimated for the series of MCO complexes.
authors.affiliation: Department of Material Science, Pridneprovs'ka State Academy of Civil Engineering and Architecture, Dnepropetrovsk 49635, Ukraine.
authors.forename: Vladimir I
authors.initials: VI
authors.lastname: Bolshakov
authors.forename: Vladimir V
authors.initials: VV
authors.lastname: Rossikhin
authors.forename: Eugene O
authors.initials: EO
authors.lastname: Voronkov
authors.forename: Sergiy I
authors.initials: SI
authors.lastname: Okovytyy
authors.forename: Jerzy
authors.initials: J
authors.lastname: Leszczynski