Selective preparation of elusive and alternative single component polymorphic solid forms through multi-component crystallisation routes
Lynne H. Thomas; Craig Wales; Chick C. Wilson; Chem.Commun. 52 (2016) 7372–; doi:

data_7119160
_publ_section_title
;
 Selective preparation of elusive and alternative single component
 polymorphic solid forms through multi-component crystallisation routes
;
_journal_name_full               Chem.Commun.
_journal_page_first              7372
_journal_volume                  52
_journal_year                    2016
_chemical_formula_moiety         'C7 H6 O5, C6 H10 N2 O2'
_chemical_formula_sum            'C13 H16 N2 O7'
_chemical_formula_weight         312.28
_chemical_name_systematic        'piracetam gallic acid'
_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
_audit_update_record
;
2016-02-01 deposited with the CCDC.
2016-04-01 downloaded from the CCDC.
;
_cell_angle_alpha                90.00
_cell_angle_beta                 103.988(5)
_cell_angle_gamma                90.00
_cell_formula_units_Z            4
_cell_length_a                   12.554(2)
_cell_length_b                   8.8499(15)
_cell_length_c                   12.6253(17)
_cell_measurement_reflns_used    10617
_cell_measurement_temperature    100(2)
_cell_measurement_theta_max      27.48
_cell_measurement_theta_min      3.0
_cell_volume                     1361.1(4)
_computing_cell_refinement       'CrystalClear 1.4.0 (Rigaku, 2008)'
_computing_data_collection       'CrystalClear 1.4.0 (Rigaku, 2008)'
_computing_data_reduction        'CrystalClear 1.4.0 (Rigaku, 2008)'
_computing_structure_refinement  'SHELXL-97 (Sheldrick, 2008)'
_computing_structure_solution    'SHELXS-97 (Sheldrick, 2008)'
_diffrn_ambient_temperature      100(2)
_diffrn_measured_fraction_theta_full 0.975
_diffrn_measured_fraction_theta_max 0.975
_diffrn_measurement_device_type
'Rigaku R-AXIS RAPID IP Image Plate diffractometer'
_diffrn_measurement_method       'Image Plate'
_diffrn_radiation_monochromator  graphite
_diffrn_radiation_source         'fine-focus sealed tube'
_diffrn_radiation_type           MoK\a
_diffrn_radiation_wavelength     0.71075
_diffrn_reflns_av_R_equivalents  0.0958
_diffrn_reflns_av_sigmaI/netI    0.0888
_diffrn_reflns_limit_h_max       16
_diffrn_reflns_limit_h_min       -16
_diffrn_reflns_limit_k_max       11
_diffrn_reflns_limit_k_min       -11
_diffrn_reflns_limit_l_max       15
_diffrn_reflns_limit_l_min       -15
_diffrn_reflns_number            10236
_diffrn_reflns_theta_full        27.48
_diffrn_reflns_theta_max         27.48
_diffrn_reflns_theta_min         3.08
_exptl_absorpt_coefficient_mu    0.125
_exptl_absorpt_correction_T_max  1.0000
_exptl_absorpt_correction_T_min  0.4798
_exptl_absorpt_correction_type   multi-scan
_exptl_absorpt_process_details   'ABSCOR, Rigaku 1995'
_exptl_crystal_density_diffrn    1.524
_exptl_crystal_density_method    'not measured'
_exptl_crystal_description       block
_exptl_crystal_F_000             656
_refine_diff_density_max         0.355
_refine_diff_density_min         -0.427
_refine_diff_density_rms         0.086
_refine_ls_extinction_method     none
_refine_ls_goodness_of_fit_ref   1.056
_refine_ls_hydrogen_treatment    mixed
_refine_ls_matrix_type           full
_refine_ls_number_parameters     263
_refine_ls_number_reflns         3044
_refine_ls_number_restraints     0
_refine_ls_restrained_S_all      1.056
_refine_ls_R_factor_all          0.1209
_refine_ls_R_factor_gt           0.0562
_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^)+(0.0663P)^2^+0.3928P] where P=(Fo^2^+2Fc^2^)/3'
_refine_ls_weighting_scheme      calc
_refine_ls_wR_factor_gt          0.1176
_refine_ls_wR_factor_ref         0.1633
_reflns_number_gt                1684
_reflns_number_total             3044
_reflns_threshold_expression     >2sigma(I)
_cod_data_source_file            c6cc01027j2.cif
_cod_data_source_block           shelxl
_cod_original_sg_symbol_H-M      P21/c
_cod_database_code               7119160