期刊
CHEMISTRY-A EUROPEAN JOURNAL
卷 23, 期 25, 页码 6150-6164出版社
WILEY-V C H VERLAG GMBH
DOI: 10.1002/chem.201604682
关键词
computational chemistry; electronic structure; protein structures; quantum chemistry
资金
- [SFB 813]
The fractional occupation number weighted density (FOD) analysis is explored as a general theoretical diagnostic for complicated electronic structures. Its main feature is to provide robustly and quickly the information on the localization of hot (strongly correlated and chemically active) electrons in a molecule. We demonstrate its usage in four different prototypical applications: 1)As a new and fast measure of the biradical character of polycyclic aromatic hydrocarbons, 2)for the selection of active orbital spaces in multiconfigurational or complete active space self consistent field (MCSCF/CASSCF) treatments, 3)as a possibility to describe molecular-energy landscapes consistently in regions with varying biradical character, as exemplified by partial double-bond torsions, and 4)as a powerful visualization method for static electron correlation effects in large biomolecules in connection with an efficient semi-empirical tight-binding molecular orbital scheme. The last application opens a full quantum-mechanical, unbiased route to the automatic detection of errors in experimental protein X-ray structures, such as false protonation states or misplaced atoms. In the first example, the complete (unfragmented) quantum-chemical calculation of the FOD for an entire metalloprotein with more than 7500 atoms is described.
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