title: Channel-forming solvates of 6-chloro-2,5-dihydroxypyridine and its solvent-free tautomer 6-chloro-5-hydroxy-2-pyridone.
abstract: On crystallization from CHCl3, CCl4, CH2ClCH2Cl and CHCl2CHCl2, 6-chloro-5-hydroxy-2-pyridone, C5H4ClNO2, (I), undergoes a tautomeric rearrangement to 6-chloro-2,5-dihydroxypyridine, (II). The resulting crystals, viz. 6-chloro-2,5-dihydroxypyridine chloroform 0.125-solvate, C5H4ClNO(2).0.125CHCl3, (IIa), 6-chloro-2,5-dihydroxypyridine carbon tetrachloride 0.125-solvate, C5H4ClNO(2)..0.125CCl4, (IIb), 6-chloro-2,5-dihydroxypyridine 1,2-dichloroethane solvate, C5H4ClNO2.C2H4Cl2, (IIc), and 6-chloro-2,5-dihydroxypyridine 1,1,2,2-tetrachloroethane solvate, C5H4ClNO2.C2H2Cl4, (IId), have I4(1)/a symmetry, and incorporate extensively disordered solvent in channels that run the length of the c axis. Upon gentle heating to 378 K in vacuo, these crystals sublime to form solvent-free crystals with P2(1)/n symmetry that are exclusively the pyridone tautomer, (I). In these sublimed pyridone crystals, inversion-related molecules form R(2)(2)(8) dimers via pairs of N-H...O hydrogen bonds. The dimers are linked by O-H...O hydrogen bonds into R(4)(6)(28) motifs, which join to form pleated sheets that stack along the a axis. In the channel-containing pyridine solvate crystals, viz. (IIa)-(IId), two independent host molecules form an R(2)(2)(8) dimer via a pair of O-H...N hydrogen bonds. One molecule is further linked by O-H...O hydrogen bonds to two 4(1) screw-related equivalents to form a helical motif parallel to the c axis. The other independent molecule is O-H...O hydrogen bonded to two 4 related equivalents to form tetrameric R(4)(4)(28) rings. The dimers are pi-pi stacked with inversion-related dimers, which in turn stack the R(4)(4)(28) rings along c to form continuous solvent-accessible channels. CHCl3, CCl4, CH2ClCH2Cl and CHCl2CHCl2 solvent molecules are able to occupy these channels but are disordered by virtue of the 4 site symmetry within the channels.
authors.affiliation: Department of Chemistry, University of Kentucky, Lexington, KY 40506-0055, USA. s.parkin@uky.edu
authors.forename: Sean R
authors.initials: SR
authors.lastname: Parkin
authors.forename: Edward J
authors.initials: EJ
authors.lastname: Behrman
mesh_terms: D002725:Chloroform / Q000737:chemistry; D018360:Crystallography, X-Ray; D006860:Hydrogen Bonding; D008956:Models, Chemical; D011725:Pyridines / Q000737:chemistry*; D011728:Pyridones / Q000737:chemistry*; D012997:Solvents / Q000737:chemistry
chemical_list: C544646:6-chloro-2,5-dihydroxypyridine; C544647:6-chloro-5-hydroxy-2-pyridone; D011725:Pyridines; D011728:Pyridones; D012997:Solvents; D002725:Chloroform