Channel-forming solvates of 6-chloro-2,5-dihydroxypyridine and its solvent-free tautomer 6-chloro-5-hydroxy-2-pyridone
Parkin, Sean R.; Behrman, Edward J.; Acta Crystallographica Section C 65 (2009) o529–o533; doi:10.1107/S0108270109036476

data_2017355
_publ_section_title
;
 Channel-forming solvates of 6-chloro-2,5-dihydroxypyridine and its
 solvent-free tautomer 6-chloro-5-hydroxy-2-pyridone
;
_journal_coeditor_code           MX3019
_journal_issue                   10
_journal_name_full               'Acta Crystallographica Section C'
_journal_page_first              o529
_journal_page_last               o533
_journal_paper_doi               10.1107/S0108270109036476
_journal_volume                  65
_journal_year                    2009
_chemical_formula_iupac          'C5 H4 Cl N O2'
_chemical_formula_moiety         'C5 H4 Cl1 N1 O2, 0.125(C2 H2 Cl4)'
_chemical_formula_sum            'C5.25 H4.25 Cl1.5 N O2'
_chemical_formula_weight         166.52
_chemical_name_systematic
;
6-Chloro-2,5-dihydroxypyridine 1,1,2,2-tetrachloroethane solvate
;
_space_group_IT_number           88
_symmetry_cell_setting           tetragonal
_symmetry_space_group_name_Hall  '-I 4ad'
_symmetry_space_group_name_H-M   'I 41/a :2'
_atom_sites_solution_hydrogens   geom
_atom_sites_solution_primary     direct
_atom_sites_solution_secondary   difmap
_audit_creation_method           SHELXL97
_cell_angle_alpha                90.00
_cell_angle_beta                 90.00
_cell_angle_gamma                90.00
_cell_formula_units_Z            32
_cell_length_a                   27.4722(2)
_cell_length_b                   27.4722(2)
_cell_length_c                   7.04950(10)
_cell_measurement_reflns_used    3298
_cell_measurement_temperature    293.0(2)
_cell_measurement_theta_max      27.48
_cell_measurement_theta_min      1.00
_cell_volume                     5320.41(9)
_computing_cell_refinement       'SCALEPACK (Otwinowski & Minor, 1997)'
_computing_data_collection       'COLLECT (Nonius, 1998)'
_computing_data_reduction        'DENZO-SMN (Otwinowski & Minor, 1997)'
_computing_molecular_graphics    'XP in SHELXTL (Sheldrick, 2008)'
_computing_publication_material
;
SHELXL97 (Sheldrick, 2008) and local procedures.
;
_computing_structure_refinement  'SHELXL97 (Sheldrick, 2008)'
_computing_structure_solution    'SHELXS97 (Sheldrick, 2008)'
_diffrn_ambient_temperature      293.0(2)
_diffrn_detector_area_resol_mean 9.1
_diffrn_measured_fraction_theta_full 1.000
_diffrn_measured_fraction_theta_max 1.000
_diffrn_measurement_device_type  'Nonius KappaCCD area-detector'
_diffrn_measurement_method       '\w scans at fixed \c = 55\%'
_diffrn_radiation_monochromator  graphite
_diffrn_radiation_source         'fine-focus sealed tube'
_diffrn_radiation_type           MoK\a
_diffrn_radiation_wavelength     0.71073
_diffrn_reflns_av_R_equivalents  0.0239
_diffrn_reflns_av_sigmaI/netI    0.0550
_diffrn_reflns_limit_h_max       24
_diffrn_reflns_limit_h_min       -24
_diffrn_reflns_limit_k_max       35
_diffrn_reflns_limit_k_min       -35
_diffrn_reflns_limit_l_max       9
_diffrn_reflns_limit_l_min       -9
_diffrn_reflns_number            61598
_diffrn_reflns_theta_full        27.46
_diffrn_reflns_theta_max         27.46
_diffrn_reflns_theta_min         1.48
_diffrn_standards_number         0
_exptl_absorpt_coefficient_mu    0.700
_exptl_absorpt_correction_T_max  0.971
_exptl_absorpt_correction_T_min  0.899
_exptl_absorpt_correction_type   multi-scan
_exptl_absorpt_process_details   '(SCALEPACK; Otwinowski & Minor, 1997)'
_exptl_crystal_colour            'pale yellow'
_exptl_crystal_density_diffrn    1.663
_exptl_crystal_density_method    'not measured'
_exptl_crystal_description       'irregular shard'
_exptl_crystal_F_000             2696
_exptl_crystal_size_max          0.22
_exptl_crystal_size_mid          0.11
_exptl_crystal_size_min          0.06
_refine_diff_density_max         0.625
_refine_diff_density_min         -0.373
_refine_ls_extinction_coef       0.0033(5)
_refine_ls_extinction_expression Fc^*^=kFc[1+0.001xFc^2^\l^3^/sin(2\q)]^-1/4^
_refine_ls_extinction_method     'SHELXL97 (Sheldrick, 2008)'
_refine_ls_goodness_of_fit_ref   1.145
_refine_ls_hydrogen_treatment    constr
_refine_ls_matrix_type           full
_refine_ls_number_parameters     168
_refine_ls_number_reflns         3045
_refine_ls_number_restraints     0
_refine_ls_restrained_S_all      1.145
_refine_ls_R_factor_all          0.0805
_refine_ls_R_factor_gt           0.0591
_refine_ls_shift/su_max          0.001
_refine_ls_shift/su_mean         0.000
_refine_ls_structure_factor_coef Fsqd
_refine_ls_weighting_details
'calc w = 1/[\s^2^(Fo^2^)+(0.1179P)^2^] where P=(Fo^2^+2Fc^2^)/3'
_refine_ls_weighting_scheme      calc
_refine_ls_wR_factor_gt          0.1835
_refine_ls_wR_factor_ref         0.1955
_reflns_number_gt                2043
_reflns_number_total             3045
_reflns_threshold_expression     I>2\s(I)
_cod_data_source_file            mx3019.cif
_cod_data_source_block           IIdRT
_cod_original_sg_symbol_H-M      'I 41/a'
_cod_original_formula_sum        'C5.25 H4.25 Cl1.5 N1 O2'
_cod_database_code               2017355