Cocrystals of Caffeine and Hydroxybenzoic Acids Composed of Multiple Supramolecular Heterosynthons: Screening via Solution-Mediated Phase Transformation and Structural Characterization
Bučar, Dejan-Krešimir; Henry, Rodger F.; Lou, Xiaochun; Duerst, Richard W.; MacGillivray, Leonard R.; Zhang, Geoff G. Z.; Crystal Growth & Design 9 (2009) 1932–; doi:10.1021/cg801178m

data_4509294
_publ_section_title
;
 Cocrystals of Caffeine and Hydroxybenzoic Acids Composed of Multiple
 Supramolecular Heterosynthons: Screening via Solution-Mediated Phase
 Transformation and Structural Characterization
;
_journal_issue                   4
_journal_name_full               'Crystal Growth &amp; Design'
_journal_page_first              1932
_journal_paper_doi               10.1021/cg801178m
_journal_volume                  9
_journal_year                    2009
_chemical_formula_moiety         'C8 H10 N4 O2, 2(C7 H6 O3)'
_chemical_formula_sum            'C22 H22 N4 O8'
_chemical_formula_weight         470.44
_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                 92.242(12)
_cell_angle_gamma                90.00
_cell_formula_units_Z            4
_cell_length_a                   7.421(5)
_cell_length_b                   22.494(15)
_cell_length_c                   12.939(9)
_cell_measurement_reflns_used    921
_cell_measurement_temperature    173(2)
_cell_measurement_theta_max      28.1315
_cell_measurement_theta_min      2.400
_cell_volume                     2158(3)
_computing_cell_refinement       'Bruker saintplus (Bruker 1999)'
_computing_data_collection       'Bruker SMART (Bruker 2001)'
_computing_data_reduction        'Bruker saintplus (Bruker 1999)'
_computing_molecular_graphics    'ORTEP (Johnson 1976), Accelrys (2004)'
_computing_structure_refinement  'SHELXL (Sheldrick, 2000)'
_computing_structure_solution    'SHELXL (Sheldrick, 2000)'
_diffrn_ambient_temperature      173(2)
_diffrn_measured_fraction_theta_full 0.974
_diffrn_measured_fraction_theta_max 0.974
_diffrn_measurement_device_type  'Bruker APEX CCD'
_diffrn_measurement_method       'omega scan'
_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  0.0443
_diffrn_reflns_av_sigmaI/netI    0.0371
_diffrn_reflns_limit_h_max       9
_diffrn_reflns_limit_h_min       -9
_diffrn_reflns_limit_k_max       29
_diffrn_reflns_limit_k_min       -29
_diffrn_reflns_limit_l_max       17
_diffrn_reflns_limit_l_min       -17
_diffrn_reflns_number            24860
_diffrn_reflns_theta_full        28.32
_diffrn_reflns_theta_max         28.32
_diffrn_reflns_theta_min         1.81
_diffrn_standards_number         0
_exptl_absorpt_coefficient_mu    0.112
_exptl_absorpt_correction_T_max  1.00
_exptl_absorpt_correction_T_min  0.70
_exptl_absorpt_correction_type   empirical
_exptl_crystal_colour            colourless
_exptl_crystal_density_diffrn    1.448
_exptl_crystal_density_method    'not measured'
_exptl_crystal_description       plate
_exptl_crystal_F_000             984
_exptl_crystal_size_max          0.30
_exptl_crystal_size_mid          0.30
_exptl_crystal_size_min          0.05
_refine_diff_density_max         0.489
_refine_diff_density_min         -0.250
_refine_diff_density_rms         0.071
_refine_ls_extinction_method     none
_refine_ls_goodness_of_fit_ref   1.244
_refine_ls_hydrogen_treatment    mixed
_refine_ls_matrix_type           full
_refine_ls_number_parameters     326
_refine_ls_number_reflns         5233
_refine_ls_number_restraints     0
_refine_ls_restrained_S_all      1.244
_refine_ls_R_factor_all          0.1072
_refine_ls_R_factor_gt           0.0924
_refine_ls_shift/su_max          0.039
_refine_ls_shift/su_mean         0.001
_refine_ls_structure_factor_coef Fsqd
_refine_ls_weighting_details
'calc w=1/[\s^2^(Fo^2^)+(0.0514P)^2^+3.2521P] where P=(Fo^2^+2Fc^2^)/3'
_refine_ls_weighting_scheme      calc
_refine_ls_wR_factor_gt          0.1857
_refine_ls_wR_factor_ref         0.1938
_reflns_number_gt                4568
_reflns_number_total             5233
_reflns_threshold_expression     I>2sigma(I)
_cod_data_source_file            cg801178msup1.cif
_cod_data_source_block           3
_cod_original_sg_symbol_H-M      P21/c
_cod_database_code               4509294