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Title: Properties of phosphorus compounds by density functional theory: CH3P species as a test case
Authors: Nguyen, Minh Tho ×
Creve, S
Vanquickenborne, LG #
Issue Date: 1996
Publisher: AMER INST PHYSICS
Series Title: Journal of Chemical Physics vol:105 issue:5 pages:1922-1932
Abstract: A comparison of different density functional theory (DFT) and molecular orbital (MO) methods for calculating molecular and energetic properties of low-coordinated phosphorus compounds is reported. While DFT methods include both Becke-Lee-Yang-Parr (BLYP and B3LYP) nonlocal functionals, MO methods involve second-order perturbation theory (MP2), quadratic configuration interaction [QCISD(T)], and coupled-cluster theory [CCSD(T)], in conjunction with the 6-31G(d,p), 6-311++G(3df,2p), and 6-311++G(3df,3pd) basis sets. Properties examined include geometrical parameters of the different CH3P equilibrium structures (phosphaethene, phosphinocarbene, methylphosphinidene, and a phosphacarbyne) and relevant transition structures for isomerisations and rearrangements in both the lowest-lying singlet and tripler states, vibrational wave numbers, relative energies, barrier heights, and singlet-triplet energy gaps. In addition, the heat of formation, ionization energy, and proton affinity of phosphaethene are also evaluated. Overall, the B3LYP method, when employed with a large basis set, yields energetic results comparable to the CCSD(T) results. Nevertheless, both DFT methods fail to predict the behavior of the addition/elimination reactions of the hydrogen atom in the triplet state. (C) 1996 American Institute of Physics.
ISSN: 0021-9606
Publication status: published
KU Leuven publication type: IT
Appears in Collections:Quantum Chemistry and Physical Chemistry Section
× corresponding author
# (joint) last author

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