| A new polymorph of physcion. | |
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MedLine Citation:
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PMID: 22850859 Owner: NLM Status: In-Data-Review |
Abstract/OtherAbstract:
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The structure of the title compound, 7-methoxy-2-methyl-4,5-dihydroxyanthracene-9,10-dione, C(16)H(12)O(5), was originally reported by Ulický et al. [Acta Cryst. (1991). C47, 1879-1881] in the space group P2(1)2(1)2(1) [polymorph (Io)]. The new polymorph, (Im), crystallizes in the space group P2(1)/c. The molecular structures are closely similar, with both -OH groups forming intramolecular hydrogen bonds to one of the neighbouring quinone O atoms, thus slightly lengthening this C=O bond; the pattern of C-C bond lengths in the ring system is consistent with some contribution from a resonance form with a negative charge at the hydrogen-bonded quinone O atom and an aromatic region around its neighbouring C atoms. The packing of (Im) is simpler than the extensively crosslinked pattern of (Io), with molecular tapes connected by classical (but three-centre) and `weak' hydrogen bonds, parallel to [20-1]. |
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Authors:
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Henning Hopf; Peter G Jones; Eva Goclik; Pauline Aust; Johanna Rödiger |
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Publication Detail:
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Type: Journal Article Date: 2012-07-19 |
Journal Detail:
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Title: Acta crystallographica. Section C, Crystal structure communications Volume: 68 ISSN: 1600-5759 ISO Abbreviation: Acta Crystallogr C Publication Date: 2012 Aug |
Date Detail:
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Created Date: 2012-08-01 Completed Date: - Revised Date: - |
Medline Journal Info:
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Nlm Unique ID: 8305826 Medline TA: Acta Crystallogr C Country: United States |
Other Details:
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Languages: eng Pagination: o317-9 Citation Subset: IM |
Affiliation:
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Institute of Organic Chemistry, Technical University of Braunschweig, Hagenring 30, D-38106 Braunschweig, Germany. |
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From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine
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