Crystal structure of dicyclohexano-18-crown-6 potassium 2-nitrophenoxide |
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| Authors: | Frank R. Fronczek Richard D. Gandour Laura M. B. Gehrig Lyman R. Caswell Karen A. McDowell I. Alam |
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| Affiliation: | (1) Department of Chemistry, Louisiana State University, 70803-1804 Baton Rouge, LA, USA;(2) Department of Chemistry, Texas Woman's University, 76204 Denton, TX, USA |
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| Abstract: | The first crystal structure of a potassium cation complex with dicyclohexano-18-crown-6 is reported. The potassium 2-nitrophenoxide complex ofsyn-cis-syn dicyclohexano-18-crown-6 crystallizes in the triclinic space group P with cell constantsa=8.604(2),b=10.772(4),C=16.123(5)Å,  =73.86(3)°, =77.61(3)°,  =82.68(3)° andZ=2 forDc=1.31 g cm–3. Least-squares refinement based on 2742 observed reflections led to a final conventionalR value of 0.040. Dicyclohexano-18-crown-6 has the shape of a saddle with the potassium cation sitting at the saddlepoint. The structure of the 2-nitrophenoxide anion is dominanted by the quinoid resonance contributor. Because the complex is devoid of significant intercomplex interactions, it is a prototypical 1:1:1 complex.Supplementary Data relating to this article are deposited with the British Library as Supplementary Publication No. SUP 82043 (26 pages).Now Mrs. K. M. Balo. |
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| Keywords: | crown ether potassium crystal structure 2-nitrophenoxide |
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