期刊
CHEMISTRY-A EUROPEAN JOURNAL
卷 22, 期 14, 页码 5003-5009出版社
WILEY-V C H VERLAG GMBH
DOI: 10.1002/chem.201504862
关键词
bond theory; computational chemistry; electron density; hydrocarbons; quantum theory
The atoms in molecules structures of 225 unsubstituted hydrocarbons are derived from both the optimized and the promolecule electron densities. A comparative analysis demonstrates that the molecular graphs derived from these two types of electron densities at the same geometry are equivalent for almost 90% of the hydrocarbons containing the same number and types of critical points. For the remaining 10% of molecules, it is demonstrated that by inducing small perturbations, through the variation of the used basis set or slight changes in the used geometry, the emerging molecular graphs from both densities are also equivalent. Interestingly, the (3, -1) critical point between two non-bonded hydrogen atoms, which triggered H-H bonding controversy is also observed in the promolecule densities of certain hydrocarbons. Evidently, the topology of the electron density is not dictated by chemical bonds or strong interactions and deformations induced by the interactions of atoms in molecules have a quite marginal role, virtually null, in shaping the general traits of the topology of molecular electron densities of the studied hydrocarbons, whereas the key factor is the underlying atomic densities.
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