The Salt−Cocrystal Continuum: The Influence of Crystal Structure on Ionization State
Childs, Scott L.; Stahly, G. Patrick; Park, Aeri; Molecular Pharmaceutics 4 (2007) 323–; doi:10.1021/mp0601345

data_1505175
_publ_section_title
;
 The Salt&#x2212;Cocrystal Continuum:&#x00A0; The Influence of Crystal
 Structure on Ionization State
;
_journal_issue                   3
_journal_name_full               'Molecular Pharmaceutics'
_journal_page_first              323
_journal_paper_doi               10.1021/mp0601345
_journal_volume                  4
_journal_year                    2007
_chemical_formula_moiety         'C7 H9 N4 O2, C7 H6 O3'
_chemical_formula_sum            'C14 H15 N4 O5'
_chemical_formula_weight         319.30
_chemical_name_common            'theophylline:salicylic acid cocrystal (1:1)'
_chemical_name_systematic
; 
 theophylline salicylic acid 
;
_space_group_IT_number           14
_symmetry_cell_setting           monoclinic
_symmetry_space_group_name_Hall  '-P 2yn'
_symmetry_space_group_name_H-M   'P 1 21/n 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                 104.754(3)
_cell_angle_gamma                90.00
_cell_formula_units_Z            4
_cell_length_a                   6.9183(3)
_cell_length_b                   25.9086(10)
_cell_length_c                   7.9749(4)
_cell_measurement_reflns_used    2105
_cell_measurement_temperature    100(2)
_cell_measurement_theta_max      65.67
_cell_measurement_theta_min      3.41
_cell_volume                     1382.32(11)
_computing_cell_refinement       'Bruker SMART'
_computing_data_collection       'Bruker SMART'
_computing_data_reduction        'Bruker SAINT'
_computing_molecular_graphics    'Bruker SHELXTL'
_computing_publication_material  'Bruker SHELXTL'
_computing_structure_refinement  'SHELXL-97 (Sheldrick, 1997)'
_computing_structure_solution    'SHELXS-97 (Sheldrick, 1990)'
_diffrn_ambient_temperature      100(2)
_diffrn_measured_fraction_theta_full 0.583
_diffrn_measured_fraction_theta_max 0.583
_diffrn_measurement_device_type  'CCD area detector'
_diffrn_measurement_method       'phi and omega scans'
_diffrn_radiation_monochromator  graphite
_diffrn_radiation_source         'fine-focus sealed tube'
_diffrn_radiation_type           CuK\a
_diffrn_radiation_wavelength     1.54178
_diffrn_reflns_av_R_equivalents  0.0605
_diffrn_reflns_av_sigmaI/netI    0.0670
_diffrn_reflns_limit_h_max       6
_diffrn_reflns_limit_h_min       -7
_diffrn_reflns_limit_k_max       30
_diffrn_reflns_limit_k_min       -19
_diffrn_reflns_limit_l_max       8
_diffrn_reflns_limit_l_min       -7
_diffrn_reflns_number            3694
_diffrn_reflns_theta_full        65.68
_diffrn_reflns_theta_max         65.68
_diffrn_reflns_theta_min         3.41
_exptl_absorpt_coefficient_mu    1.007
_exptl_absorpt_correction_type   none
_exptl_crystal_colour            colorless
_exptl_crystal_density_diffrn    1.534
_exptl_crystal_density_method    'not measured'
_exptl_crystal_description       needle
_exptl_crystal_F_000             668
_exptl_crystal_size_max          0.33
_exptl_crystal_size_mid          0.03
_exptl_crystal_size_min          0.03
_refine_diff_density_max         0.277
_refine_diff_density_min         -0.203
_refine_diff_density_rms         0.052
_refine_ls_extinction_method     none
_refine_ls_goodness_of_fit_ref   1.014
_refine_ls_hydrogen_treatment    mixed
_refine_ls_matrix_type           full
_refine_ls_number_parameters     213
_refine_ls_number_reflns         1396
_refine_ls_number_restraints     0
_refine_ls_restrained_S_all      1.014
_refine_ls_R_factor_all          0.0777
_refine_ls_R_factor_gt           0.0508
_refine_ls_shift/su_max          0.012
_refine_ls_shift/su_mean         0.001
_refine_ls_structure_factor_coef Fsqd
_refine_ls_weighting_details
'calc w=1/[\s^2^(Fo^2^)+(0.0659P)^2^+0.0000P] where P=(Fo^2^+2Fc^2^)/3'
_refine_ls_weighting_scheme      calc
_refine_ls_wR_factor_gt          0.1045
_refine_ls_wR_factor_ref         0.1119
_reflns_number_gt                996
_reflns_number_total             1396
_reflns_threshold_expression     >2sigma(I)
_cod_data_source_file            mp0601345si20061227_041052.cif
_cod_data_source_block           4
_cod_depositor_comments
;
The following automatic conversions were performed:

'_symmetry_cell_setting' value 'Monoclinic' changed to 'monoclinic'
according to /home/saulius/struct/CIF-dictionaries/cif_core.dic
dictionary named 'cif_core.dic' version 2.4.1 from 2010-06-29.

Automatic conversion script
Id: cif_fix_values 1715 2011-07-08 13:25:40Z adriana 
;
_cod_original_sg_symbol_H-M      P2(1)/n
_cod_database_code               1505175