Energetics and structure of hydroxynicotinic acids. Crystal structures of 2-, 4-, 6-hydroxynicotinic and 5-chloro-6-hydroxynicotinic acids.
Santos, Rui C.; Figueira, Rita M. B. B. M.; Piedade, M Fátima M; Diogo, Hermínio P; Minas da Piedade, Manuel E.; The journal of physical chemistry. B 113 (2009) 14291–14309; doi:10.1021/jp906908n

data_1516412
_publ_section_title
;
 Energetics and structure of hydroxynicotinic acids. Crystal structures of
 2-, 4-, 6-hydroxynicotinic and 5-chloro-6-hydroxynicotinic acids.
;
_journal_issue                   43
_journal_name_full               'The journal of physical chemistry. B'
_journal_page_first              14291
_journal_page_last               14309
_journal_paper_doi               10.1021/jp906908n
_journal_volume                  113
_journal_year                    2009
_chemical_formula_sum            'C6 H4 Cl N O3'
_chemical_formula_weight         173.55
_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                 97.72(2)
_cell_angle_gamma                90.00
_cell_formula_units_Z            4
_cell_length_a                   5.469(2)
_cell_length_b                   10.529(4)
_cell_length_c                   11.795(4)
_cell_measurement_reflns_used    25
_cell_measurement_temperature    293(2)
_cell_measurement_theta_max      25.7
_cell_measurement_theta_min      12.5
_cell_volume                     673.0(4)
_computing_structure_refinement  'SHELXL-97 (Sheldrick, 2008)'
_diffrn_ambient_temperature      293(2)
_diffrn_measured_fraction_theta_full 1.000
_diffrn_measured_fraction_theta_max 1.001
_diffrn_radiation_monochromator  graphite
_diffrn_radiation_source         'fine-focus sealed tube'
_diffrn_radiation_type           CuK\a
_diffrn_radiation_wavelength     1.54180
_diffrn_reflns_av_R_equivalents  0.0452
_diffrn_reflns_av_sigmaI/netI    0.0183
_diffrn_reflns_limit_h_max       0
_diffrn_reflns_limit_h_min       -6
_diffrn_reflns_limit_k_max       13
_diffrn_reflns_limit_k_min       0
_diffrn_reflns_limit_l_max       14
_diffrn_reflns_limit_l_min       -14
_diffrn_reflns_number            1485
_diffrn_reflns_theta_full        72.91
_diffrn_reflns_theta_max         72.91
_diffrn_reflns_theta_min         5.66
_exptl_absorpt_coefficient_mu    4.676
_exptl_absorpt_correction_type   none
_exptl_crystal_colour            colourless
_exptl_crystal_density_diffrn    1.713
_exptl_crystal_density_method    'not measured'
_exptl_crystal_description       prism
_exptl_crystal_F_000             352
_exptl_crystal_size_max          0.22
_exptl_crystal_size_mid          0.19
_exptl_crystal_size_min          0.19
_refine_diff_density_max         0.342
_refine_diff_density_min         -0.393
_refine_diff_density_rms         0.072
_refine_ls_extinction_coef       0.0113(18)
_refine_ls_extinction_expression Fc^*^=kFc[1+0.001xFc^2^\l^3^/sin(2\q)]^-1/4^
_refine_ls_extinction_method     SHELXL
_refine_ls_goodness_of_fit_ref   1.063
_refine_ls_hydrogen_treatment    mixed
_refine_ls_matrix_type           full
_refine_ls_number_parameters     117
_refine_ls_number_reflns         1343
_refine_ls_number_restraints     0
_refine_ls_restrained_S_all      1.063
_refine_ls_R_factor_all          0.0435
_refine_ls_R_factor_gt           0.0406
_refine_ls_shift/su_max          0.029
_refine_ls_shift/su_mean         0.005
_refine_ls_structure_factor_coef Fsqd
_refine_ls_weighting_details
'calc w=1/[\s^2^(Fo^2^)+(0.0735P)^2^+0.2855P] where P=(Fo^2^+2Fc^2^)/3'
_refine_ls_weighting_scheme      calc
_refine_ls_wR_factor_gt          0.1122
_refine_ls_wR_factor_ref         0.1167
_reflns_number_gt                1246
_reflns_number_total             1343
_reflns_threshold_expression     >2\s(I)
_cod_data_source_file            jp906908n_si_005.cif
_cod_data_source_block           rui56b
_cod_original_sg_symbol_H-M      P21/c
_cod_database_code               1516412