Crystal structures of morpholinium hydrogen bromanilate at 130, 145 and 180 K

Acta Crystallographica Section E: Crystallographic Communications

Yuki Tahara¹  Hiroyuki Ishida¹  Kazuma Gotoh¹ 

[1] Department of Chemistry, Faculty of Science, Okayama University, Okayama 700-8530, Japan;

关键词: crystal structure;    bromanilic acid;    morpholine;    hydrogen-bonding;    proton disorder;   

DOI  :  10.1107/S2056989015017272

来源: DOAJ

【 摘 要 】

Crystal structures of the title compound (systematic name: morpholin-4-ium 2,5-dibromo-4-hydroxy-3,6-dioxocyclohexa-1,4-dien-1-olate), C4H10NO+·C6HBr2O4−, were determined at three temperatures, viz. 130, 145 and 180 K. The asymmetric unit comprises one morpholinium cation and two halves of crystallographically independent bromanilate monoanions, which are located on inversion centres. The conformations of the two independent bromanilate anions are different from each other with respect to the O—H orientation. In the crystal, the two different anions are linked alternately into a chain along [211] through a short O—H...O hydrogen bond, in which the H atom is disordered over two positions. The refined site-occupancy ratios, which are almost constant in the temperature range studied, are 0.49 (3):0.51 (3), 0.52 (3):0.48 (3) and 0.50 (3):0.50 (3), respectively, at 130, 145 and 180 K, and no significant difference in the molecular geometry and the molecular packing is observed at the three temperatures. The morpholinium cation links adjacent chains of anions via N—H...O hydrogen bonds, forming a sheet structure parallel to (-111).

【 授权许可】

Unknown