Violuric acid monohydrate: a definitive redetermination at 150 K
Nichol, Gary S.; Clegg, William; Acta Crystallographica Section E 61 (2005) o3788–o3790; doi:10.1107/S160053680503343X

data_2207159
_publ_section_title
;
 Violuric acid monohydrate: a definitive redetermination at 150 K
;
_journal_coeditor_code           BT6764
_journal_issue                   11
_journal_name_full               'Acta Crystallographica Section E'
_journal_page_first              o3788
_journal_page_last               o3790
_journal_paper_doi               10.1107/S160053680503343X
_journal_volume                  61
_journal_year                    2005
_chemical_formula_iupac          'C4 H3 N3 O4, H2 O'
_chemical_formula_moiety         'C4 H3 N3 O4, H2 O'
_chemical_formula_sum            'C4 H5 N3 O5'
_chemical_formula_weight         175.11
_chemical_name_common            'Violuric acid monohydrate'
_chemical_name_systematic
;
Violuric acid monohydrate
;
_space_group_IT_number           36
_symmetry_cell_setting           orthorhombic
_symmetry_space_group_name_Hall  'C 2c -2'
_symmetry_space_group_name_H-M   'C m c 21'
_atom_sites_solution_hydrogens   difmap
_atom_sites_solution_primary     direct
_atom_sites_solution_secondary   difmap
_cell_angle_alpha                90.00
_cell_angle_beta                 90.00
_cell_angle_gamma                90.00
_cell_formula_units_Z            4
_cell_length_a                   6.0754(11)
_cell_length_b                   14.343(3)
_cell_length_c                   7.5288(13)
_cell_measurement_reflns_used    2281
_cell_measurement_temperature    150(2)
_cell_measurement_theta_max      28.3
_cell_measurement_theta_min      2.2
_cell_volume                     656.1(2)
_computing_cell_refinement       'SAINT (Bruker, 2001)'
_computing_data_collection       'SMART (Bruker, 2001)'
_computing_data_reduction        SAINT
_computing_molecular_graphics    'DIAMOND (Brandenburg & Putz, 2004)'
_computing_publication_material  'SHELXTL and local programs'
_computing_structure_refinement  'SHELXTL (Sheldrick, 2001)'
_computing_structure_solution    'SIR92 (Altomare et al., 1993)'
_diffrn_ambient_temperature      150(2)
_diffrn_measured_fraction_theta_full 0.997
_diffrn_measured_fraction_theta_max 0.973
_diffrn_measurement_device_type  'Bruker SMART 1K CCD'
_diffrn_measurement_method       'thin-slice \w'
_diffrn_radiation_monochromator  graphite
_diffrn_radiation_source         'sealed tube'
_diffrn_radiation_type           MoK\a
_diffrn_radiation_wavelength     0.71073
_diffrn_reflns_av_R_equivalents  0.0177
_diffrn_reflns_av_sigmaI/netI    0.0130
_diffrn_reflns_limit_h_max       8
_diffrn_reflns_limit_h_min       -8
_diffrn_reflns_limit_k_max       19
_diffrn_reflns_limit_k_min       -18
_diffrn_reflns_limit_l_max       9
_diffrn_reflns_limit_l_min       -9
_diffrn_reflns_number            2856
_diffrn_reflns_theta_full        26.00
_diffrn_reflns_theta_max         28.32
_diffrn_reflns_theta_min         2.84
_diffrn_standards_number         0
_exptl_absorpt_coefficient_mu    0.165
_exptl_absorpt_correction_type   none
_exptl_crystal_colour            colourless
_exptl_crystal_density_diffrn    1.773
_exptl_crystal_density_method    'not measured'
_exptl_crystal_description       octahedron
_exptl_crystal_F_000             360
_exptl_crystal_size_max          0.50
_exptl_crystal_size_mid          0.50
_exptl_crystal_size_min          0.50
_refine_diff_density_max         0.389
_refine_diff_density_min         -0.262
_refine_ls_extinction_coef       0.008(2)
_refine_ls_extinction_expression Fc^*^=kFc[1+0.001xFc^2^\l^3^/sin(2\q)]^-1/4^
_refine_ls_extinction_method     SHELXL97
_refine_ls_goodness_of_fit_ref   1.103
_refine_ls_hydrogen_treatment    refxyz
_refine_ls_matrix_type           full
_refine_ls_number_parameters     87
_refine_ls_number_reflns         468
_refine_ls_number_restraints     1
_refine_ls_restrained_S_all      1.101
_refine_ls_R_factor_all          0.0294
_refine_ls_R_factor_gt           0.0282
_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^)+(0.0763P)^2^+0.0025P] where P = (Fo^2^+2Fc^2^)/3'
_refine_ls_weighting_scheme      calc
_refine_ls_wR_factor_gt          0.0826
_refine_ls_wR_factor_ref         0.0849
_reflns_number_gt                448
_reflns_number_total             468
_reflns_threshold_expression     I>2\s(I)
_cod_data_source_file            bt6764.cif
_cod_data_source_block           I
_cod_database_code               2207159
_cod_database_fobs_code          2207159