Exploring cocrystal-cocrystal reactivity via liquid-assisted grinding: assembling of racemic and dismantling of enantiomeric cocrystals
W. Jones; Jonathan C. Burley; Laszlo Fabian; Tomislav Friscic; W. D. Sam Motherwell; Chemical Communications  (2006) –; doi:10.1039/b613073a

data_7101605
_publ_section_title
;
Exploring cocrystal-cocrystal reactivity via
liquid-assisted grinding: assembling of racemic and dismantling of
enantiomeric cocrystals
;
_journal_issue                   48
_journal_name_full               'Chemical Communications'
_journal_paper_doi               10.1039/b613073a
_journal_year                    2006
_chemical_formula_moiety         'C8 H10 N4 O2, C4 H6 O6'
_chemical_formula_sum            'C12 H16 N4 O8'
_chemical_formula_weight         344.29
_chemical_name_common            'Caffeine-D-tartaric acid 1/1'
_chemical_name_systematic
;
Caffeine-D-tartaric acid 1/1
;
_space_group_IT_number           19
_symmetry_cell_setting           orthorhombic
_symmetry_space_group_name_Hall  'P 2ac 2ab'
_symmetry_space_group_name_H-M   'P 21 21 21'
_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                 90.00
_cell_angle_gamma                90.00
_cell_formula_units_Z            4
_cell_length_a                   5.8024(1)
_cell_length_b                   10.0260(1)
_cell_length_c                   25.3674(4)
_cell_measurement_reflns_used    12291
_cell_measurement_temperature    120(2)
_cell_measurement_theta_max      27.48
_cell_measurement_theta_min      1.00
_cell_volume                     1475.74(4)
_computing_cell_refinement       'HKL Scalepack (Otwinowski & Minor 1997)'
_computing_data_collection       'Collect (Nonius B.V. 1998)'
_computing_data_reduction
;
HKL Denzo and Scalepack (Otwinowski & Minor 1997)
;
_computing_publication_material  'SHELXL-97 (Sheldrick 1997)'
_computing_structure_refinement  'SHELXL-97 (Sheldrick 1997)'
_computing_structure_solution    'SIR-92 (Altomare et al. 1994)'
_diffrn_ambient_temperature      120(2)
_diffrn_measured_fraction_theta_full 0.994
_diffrn_measured_fraction_theta_max 0.994
_diffrn_measurement_device_type  'Nonius Kappa CCD'
_diffrn_measurement_method       'Thin slice \w and \f scans'
_diffrn_radiation_source         'fine-focus sealed tube'
_diffrn_radiation_type           MoK\a
_diffrn_radiation_wavelength     0.71073
_diffrn_reflns_av_R_equivalents  0.0237
_diffrn_reflns_av_sigmaI/netI    0.0233
_diffrn_reflns_limit_h_max       7
_diffrn_reflns_limit_h_min       -7
_diffrn_reflns_limit_k_max       13
_diffrn_reflns_limit_k_min       -12
_diffrn_reflns_limit_l_max       32
_diffrn_reflns_limit_l_min       -32
_diffrn_reflns_number            13886
_diffrn_reflns_theta_full        27.47
_diffrn_reflns_theta_max         27.47
_diffrn_reflns_theta_min         3.60
_exptl_absorpt_coefficient_mu    0.132
_exptl_absorpt_correction_T_max  0.987
_exptl_absorpt_correction_T_min  0.930
_exptl_absorpt_correction_type   multi-scan
_exptl_absorpt_process_details
;
multi-scan from symmetry-related measurements
Sortav (Blessing 1995)
;
_exptl_crystal_colour            colourless
_exptl_crystal_density_diffrn    1.550
_exptl_crystal_density_method    'not measured'
_exptl_crystal_description       prism
_exptl_crystal_F_000             720
_exptl_crystal_size_max          0.46
_exptl_crystal_size_mid          0.14
_exptl_crystal_size_min          0.10
_refine_diff_density_max         0.212
_refine_diff_density_min         -0.212
_refine_diff_density_rms         0.041
_refine_ls_abs_structure_details 'Flack H D (1983), Acta Cryst. A39, 876-881'
_refine_ls_abs_structure_Flack   -0.1(7)
_refine_ls_extinction_method     none
_refine_ls_goodness_of_fit_ref   1.085
_refine_ls_hydrogen_treatment    constr
_refine_ls_matrix_type           full
_refine_ls_number_parameters     222
_refine_ls_number_reflns         3327
_refine_ls_number_restraints     0
_refine_ls_restrained_S_all      1.085
_refine_ls_R_factor_all          0.0289
_refine_ls_R_factor_gt           0.0275
_refine_ls_shift/su_max          0.045
_refine_ls_shift/su_mean         0.001
_refine_ls_structure_factor_coef Fsqd
_refine_ls_weighting_details
'calc w=1/[\s^2^(Fo^2^)+(0.0310P)^2^+0.3929P] where P=(Fo^2^+2Fc^2^)/3'
_refine_ls_weighting_scheme      calc
_refine_ls_wR_factor_gt          0.0685
_refine_ls_wR_factor_ref         0.0696
_reflns_number_gt                3218
_reflns_number_total             3327
_reflns_threshold_expression     >2sigma(I)
_cod_data_source_file            b613073a.txt
_cod_original_sg_symbol_H-M      P212121
_cod_database_code               7101605