Ionic Co-crystals of Organic Molecules with Metal Halides: A New Prospect in the Solid Formulation of Active Pharmaceutical Ingredients
Braga, Dario; Grepioni, Fabrizia; Lampronti, Giulio I.; Maini, Lucia; Turrina, Alessandro; Crystal Growth & Design 11 (2011) 5621–; doi:10.1021/cg201177p

data_4501376
_publ_section_title
;
 Ionic Co-crystals of Organic Molecules with Metal Halides: A New Prospect
 in the Solid Formulation of Active Pharmaceutical Ingredients
;
_journal_issue                   12
_journal_name_full               'Crystal Growth &amp; Design'
_journal_page_first              5621
_journal_paper_doi               10.1021/cg201177p
_journal_volume                  11
_journal_year                    2011
_chemical_formula_sum            'C12 H24 Cl2 N4 O6 Sr'
_chemical_formula_weight         478.87
_chemical_name_systematic
; 
piracetam2 SrCl2 (H2O)2 
;
_space_group_IT_number           14
_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                 106.520(7)
_cell_angle_gamma                90.00
_cell_formula_units_Z            2
_cell_length_a                   8.9444(5)
_cell_length_b                   9.8519(4)
_cell_length_c                   11.8823(7)
_cell_measurement_reflns_used    1872
_cell_measurement_temperature    293(2)
_cell_measurement_theta_max      28.7917
_cell_measurement_theta_min      3.1432
_cell_volume                     1003.84(10)
_computing_structure_refinement  'SHELXL-97 (Sheldrick, 1997)'
_computing_structure_solution    'SHELXS-97 (Sheldrick, 1990)'
_diffrn_ambient_temperature      293(2)
_diffrn_measured_fraction_theta_full 0.981
_diffrn_measured_fraction_theta_max 0.836
_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  0.0278
_diffrn_reflns_av_sigmaI/netI    0.0624
_diffrn_reflns_limit_h_max       4
_diffrn_reflns_limit_h_min       -11
_diffrn_reflns_limit_k_max       12
_diffrn_reflns_limit_k_min       -9
_diffrn_reflns_limit_l_max       16
_diffrn_reflns_limit_l_min       -15
_diffrn_reflns_number            3524
_diffrn_reflns_theta_full        25.00
_diffrn_reflns_theta_max         28.73
_diffrn_reflns_theta_min         3.15
_exptl_absorpt_coefficient_mu    2.985
_exptl_absorpt_correction_T_max  1.00000
_exptl_absorpt_correction_T_min  0.27332
_exptl_absorpt_correction_type   multi-scan
_exptl_absorpt_process_details
;
CrysAlisPro, Oxford Diffraction Ltd.,
Version 1.171.34.40 (release 27-08-2010 CrysAlis171 .NET)
(compiled Aug 27 2010,11:50:40)
Empirical absorption correction using spherical harmonics,
 implemented in SCALE3 ABSPACK scaling algorithm.
;
_exptl_crystal_colour            colorless
_exptl_crystal_density_diffrn    1.584
_exptl_crystal_density_method    'not measured'
_exptl_crystal_F_000             488
_exptl_crystal_size_max          0.56
_exptl_crystal_size_mid          0.44
_exptl_crystal_size_min          0.32
_refine_diff_density_max         0.416
_refine_diff_density_min         -0.400
_refine_diff_density_rms         0.074
_refine_ls_extinction_coef       0.0077(11)
_refine_ls_extinction_expression Fc^*^=kFc[1+0.001xFc^2^\l^3^/sin(2\q)]^-1/4^
_refine_ls_extinction_method     SHELXL
_refine_ls_goodness_of_fit_ref   0.933
_refine_ls_hydrogen_treatment    mixed
_refine_ls_matrix_type           full
_refine_ls_number_parameters     132
_refine_ls_number_reflns         2171
_refine_ls_number_restraints     0
_refine_ls_restrained_S_all      0.933
_refine_ls_R_factor_all          0.0687
_refine_ls_R_factor_gt           0.0377
_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^)+(0.0380P)^2^+0.0000P] where P=(Fo^2^+2Fc^2^)/3'
_refine_ls_weighting_scheme      calc
_refine_ls_wR_factor_gt          0.0691
_refine_ls_wR_factor_ref         0.0750
_reflns_number_gt                1506
_reflns_number_total             2171
_reflns_threshold_expression     >2sigma(I)
_cod_data_source_file            cg201177p_si_001.cif
_cod_data_source_block           piracetam2SrCl2(H2O)2
_cod_original_cell_volume        1003.84(9)
_cod_database_code               4501376