Four salt phases of theophylline
Buist, Amanda R.; Kennedy, Alan R.; Manzie, Craig; Acta Crystallographica Section C 70 (2014) 220–224; doi:10.1107/S2053229614000825

data_2019389
_publ_section_title
;
 Four salt phases of theophylline
;
_journal_coeditor_code           GZ3251
_journal_issue                   2
_journal_name_full               'Acta Crystallographica Section C'
_journal_page_first              220
_journal_page_last               224
_journal_paper_doi               10.1107/S2053229614000825
_journal_volume                  70
_journal_year                    2014
_chemical_formula_iupac          'C7 H9 N4 O2 +, Cl1 -, H2 O1'
_chemical_formula_moiety         'C7 H9 N4 O2 +, Cl1 -, H2 O1'
_chemical_formula_sum            'C7 H11 Cl N4 O3'
_chemical_formula_weight         234.65
_chemical_name_systematic
;
1,3-Dimethyl-2,6-dioxo-7<i>H</i>-purin-9-ium chloride
;
_space_group_IT_number           62
_symmetry_cell_setting           orthorhombic
_symmetry_space_group_name_Hall  '-P 2ac 2n'
_symmetry_space_group_name_H-M   'P n m a'
_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            4
_cell_length_a                   13.8664(7)
_cell_length_b                   6.4623(3)
_cell_length_c                   11.3634(6)
_cell_measurement_reflns_used    715
_cell_measurement_temperature    123(2)
_cell_measurement_theta_max      71.4901
_cell_measurement_theta_min      3.8868
_cell_volume                     1018.26(9)
_computing_cell_refinement       'CrysAlis PRO (Oxford Diffraction, 2010)'
_computing_data_collection       'CrysAlis PRO (Oxford Diffraction, 2010)'
_computing_data_reduction        'CrysAlis PRO (Oxford Diffraction, 2010)'
_computing_molecular_graphics
;
ORTEP-3 for Windows (Farrugia, 2012) and X-SEED (Barbour, 2001)
;
_computing_publication_material  'SHELXL97 (Sheldrick, 2008)'
_computing_structure_refinement  'SHELXL97 (Sheldrick, 2008)'
_computing_structure_solution    'SHELXS97 (Sheldrick, 2008)'
_diffrn_ambient_temperature      123(2)
_diffrn_measured_fraction_theta_full 0.995
_diffrn_measured_fraction_theta_max 0.985
_diffrn_measurement_device_type  'Oxford Diffraction Gemini S'
_diffrn_measurement_method       'omega scans'
_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  0.0170
_diffrn_reflns_av_sigmaI/netI    0.0137
_diffrn_reflns_limit_h_max       17
_diffrn_reflns_limit_h_min       -11
_diffrn_reflns_limit_k_max       7
_diffrn_reflns_limit_k_min       -7
_diffrn_reflns_limit_l_max       14
_diffrn_reflns_limit_l_min       -11
_diffrn_reflns_number            3701
_diffrn_reflns_theta_full        70.00
_diffrn_reflns_theta_max         72.99
_diffrn_reflns_theta_min         7.48
_diffrn_standards_decay_%        0
_diffrn_standards_interval_count 0
_diffrn_standards_number         0
_exptl_absorpt_coefficient_mu    3.331
_exptl_absorpt_correction_T_max  1.00000
_exptl_absorpt_correction_T_min  0.54225
_exptl_absorpt_correction_type   multi-scan
_exptl_absorpt_process_details
;
(CrysAlis PRO; Oxford Diffraction, 2010)
;
_exptl_crystal_colour            colourless
_exptl_crystal_density_diffrn    1.531
_exptl_crystal_density_method    'not measured'
_exptl_crystal_description       'fragment from plate'
_exptl_crystal_F_000             488
_exptl_crystal_size_max          0.28
_exptl_crystal_size_mid          0.18
_exptl_crystal_size_min          0.04
_refine_diff_density_max         0.341
_refine_diff_density_min         -0.324
_refine_ls_extinction_method     none
_refine_ls_goodness_of_fit_ref   1.117
_refine_ls_hydrogen_treatment    mixed
_refine_ls_matrix_type           full
_refine_ls_number_parameters     106
_refine_ls_number_reflns         1090
_refine_ls_number_restraints     3
_refine_ls_restrained_S_all      1.116
_refine_ls_R_factor_all          0.0293
_refine_ls_R_factor_gt           0.0290
_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^)+(0.0478P)^2^+0.3984P] where P=(Fo^2^+2Fc^2^)/3'
_refine_ls_weighting_scheme      calc
_refine_ls_wR_factor_gt          0.0810
_refine_ls_wR_factor_ref         0.0813
_reflns_number_gt                1077
_reflns_number_total             1090
_reflns_threshold_expression     I>2\s(I)
_cod_data_source_file            gz3251sup1.cif
_cod_data_source_block           II
_cod_database_code               2019389