<i>N</i>-Hydroxypyridine-4-carboxamide
Wu, Qingkun; Yin, Handong; Acta Crystallographica Section E 67 (2011) o1905–; doi:10.1107/S1600536811025566

data_2231322
_publ_section_title
;
 <i>N</i>-Hydroxypyridine-4-carboxamide
;
_journal_coeditor_code           TK2754
_journal_issue                   8
_journal_name_full               'Acta Crystallographica Section E'
_journal_page_first              o1905
_journal_paper_doi               10.1107/S1600536811025566
_journal_volume                  67
_journal_year                    2011
_chemical_formula_iupac          'C6 H6 N2 O2'
_chemical_formula_moiety         'C6 H6 N2 O2'
_chemical_formula_sum            'C6 H6 N2 O2'
_chemical_formula_weight         138.13
_chemical_name_systematic
;
<i>N</i>-Hydroxypyridine-4-carboxamide
;
_space_group_IT_number           14
_symmetry_cell_setting           monoclinic
_symmetry_space_group_name_Hall  '-P 2ybc'
_symmetry_space_group_name_H-M   'P 1 21/c 1'
_atom_sites_solution_hydrogens   geom
_atom_sites_solution_primary     direct
_atom_sites_solution_secondary   difmap
_audit_creation_method           SHELXL-97
_cell_angle_alpha                90.00
_cell_angle_beta                 99.5790(10)
_cell_angle_gamma                90.00
_cell_formula_units_Z            4
_cell_length_a                   4.8765(5)
_cell_length_b                   13.4476(16)
_cell_length_c                   9.6656(11)
_cell_measurement_reflns_used    1066
_cell_measurement_temperature    298(2)
_cell_measurement_theta_max      26.002
_cell_measurement_theta_min      2.626
_cell_volume                     625.01(12)
_computing_cell_refinement       'SAINT (Siemens, 1996)'
_computing_data_collection       'SMART (Siemens, 1996)'
_computing_data_reduction        'SAINT (Siemens, 1996)'
_computing_molecular_graphics    'SHELXTL (Sheldrick, 2008)'
_computing_publication_material  'SHELXTL (Sheldrick, 2008)'
_computing_structure_refinement  'SHELXL97 (Sheldrick, 2008)'
_computing_structure_solution    'SHELXS97 (Sheldrick, 2008)'
_diffrn_ambient_temperature      298(2)
_diffrn_measured_fraction_theta_full 0.995
_diffrn_measured_fraction_theta_max 0.995
_diffrn_measurement_device_type  'Bruker SMART CCD area-detector'
_diffrn_measurement_method       '\f and \w scans'
_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  0.0237
_diffrn_reflns_av_sigmaI/netI    0.0274
_diffrn_reflns_limit_h_max       5
_diffrn_reflns_limit_h_min       -5
_diffrn_reflns_limit_k_max       16
_diffrn_reflns_limit_k_min       -13
_diffrn_reflns_limit_l_max       10
_diffrn_reflns_limit_l_min       -11
_diffrn_reflns_number            3030
_diffrn_reflns_theta_full        25.02
_diffrn_reflns_theta_max         25.02
_diffrn_reflns_theta_min         2.62
_exptl_absorpt_coefficient_mu    0.113
_exptl_absorpt_correction_T_max  0.9832
_exptl_absorpt_correction_T_min  0.9614
_exptl_absorpt_correction_type   multi-scan
_exptl_absorpt_process_details   '(SADABS; Sheldrick, 1996)'
_exptl_crystal_colour            pale-red
_exptl_crystal_density_diffrn    1.468
_exptl_crystal_density_method    'not measured'
_exptl_crystal_description       block
_exptl_crystal_F_000             288
_exptl_crystal_size_max          0.35
_exptl_crystal_size_mid          0.24
_exptl_crystal_size_min          0.15
_refine_diff_density_max         0.153
_refine_diff_density_min         -0.161
_refine_ls_extinction_method     none
_refine_ls_goodness_of_fit_ref   1.052
_refine_ls_hydrogen_treatment    constr
_refine_ls_matrix_type           full
_refine_ls_number_parameters     92
_refine_ls_number_reflns         1092
_refine_ls_number_restraints     0
_refine_ls_restrained_S_all      1.052
_refine_ls_R_factor_all          0.0615
_refine_ls_R_factor_gt           0.0394
_refine_ls_shift/su_max          0.000
_refine_ls_shift/su_mean         0.000
_refine_ls_structure_factor_coef Fsqd
_refine_ls_weighting_details
'calc w=1/[\s^2^(Fo^2^)+(0.0528P)^2^+0.2080P] where P=(Fo^2^+2Fc^2^)/3'
_refine_ls_weighting_scheme      calc
_refine_ls_wR_factor_gt          0.1002
_refine_ls_wR_factor_ref         0.1152
_reflns_number_gt                769
_reflns_number_total             1092
_reflns_threshold_expression     I>2sigma(I)
_cod_data_source_file            tk2754.cif
_cod_data_source_block           I
_cod_original_sg_symbol_H-M      'P 21/c'
_cod_database_code               2231322
_cod_database_fobs_code          2231322