Deducing chemical structure from crystallographically determined atomic coordinates
Identifieur interne : 002D27 ( Istex/Corpus ); précédent : 002D26; suivant : 002D28Deducing chemical structure from crystallographically determined atomic coordinates
Auteurs : Ian J. Bruno ; Gregory P. Shields ; Robin TaylorSource :
- Acta Crystallographica Section B [ 0108-7681 ] ; 2011-08-01.
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Abstract
An improved algorithm has been developed for assigning chemical structures to incoming entries to the Cambridge Structural Database, using only the information available in the deposited CIF. Steps in the algorithm include detection of bonds, selection of polymer unit, resolution of disorder, and assignment of bond types and formal charges. The chief difficulty is posed by the large number of metallo‐organic crystal structures that must be processed, given our aspiration that assigned chemical structures should accurately reflect properties such as the oxidation states of metals and redox‐active ligands, metal coordination numbers and hapticities, and the aromaticity or otherwise of metal ligands. Other complications arise from disorder, especially when it is symmetry imposed or modelled with the SQUEEZE algorithm. Each assigned structure is accompanied by an estimate of reliability and, where necessary, diagnostic information indicating probable points of error. Although the algorithm was written to aid building of the Cambridge Structural Database, it has the potential to develop into a general‐purpose tool for adding chemical information to newly determined crystal structures.
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DOI: 10.1107/S0108768111024608
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