Adding a Pinch of Salt: Using Ionic Mixed-Crystal Seeds to Search for New Solid Forms
Abdel Rahman Al Ahmad; Thierry Maris; Christian Pellerin; James D. Wuest; Crystal Growth & Design 23 (2023) 7472–7481; doi:10.1021/acs.cgd.3c00884

data_4519452
_publ_section_title
;
 Adding a Pinch of Salt: Using Ionic Mixed-Crystal Seeds to Search for New
 Solid Forms
;
_journal_name_full               'Crystal Growth & Design'
_journal_page_first              7472
_journal_page_last               7481
_journal_paper_doi               10.1021/acs.cgd.3c00884
_journal_volume                  23
_journal_year                    2023
_chemical_formula_moiety         'C12 H14 N2, 2(Br)'
_chemical_formula_sum            'C12 H14 Br2 N2'
_chemical_formula_weight         346.07
_chemical_name_common            'Paraquat Dibromide'
_chemical_name_systematic
;
1,1'-dimethyl-4,4'-bipyridin-1-ium dibromide
;
_space_group_crystal_system      monoclinic
_space_group_IT_number           14
_space_group_name_Hall           '-P 2ybc'
_space_group_name_H-M_alt        'P 1 21/c 1'
_atom_sites_solution_hydrogens   difmap
_atom_sites_solution_primary     dual
_cell_angle_alpha                90
_cell_angle_beta                 96.191(1)
_cell_angle_gamma                90
_cell_formula_units_Z            2
_cell_length_a                   5.9183(2)
_cell_length_b                   8.0344(2)
_cell_length_c                   13.4237(4)
_cell_measurement_reflns_used    9989
_cell_measurement_temperature    100
_cell_measurement_theta_max      71.667
_cell_measurement_theta_min      3.312
_cell_volume                     634.57(3)
_computing_cell_refinement
;
SAINT (2013) V8.40B; Integration Software for Single Crystal Data.
Bruker AXS Inc., Madison, WI 53719-1173.
;
_computing_data_collection
;
APEX 3 (2019) Bruker AXS Inc., Madison, WI 53719-1173.
;
_computing_data_reduction
;
SAINT (2013) V8.40B; Integration Software for Single Crystal Data.
Bruker AXS Inc., Madison, WI 53719-1173.
;
_computing_molecular_graphics    'Olex2 1.3 (Dolomanov et al., 2009)'
_computing_publication_material  'Olex2 1.3 (Dolomanov et al., 2009)'
_computing_structure_refinement  'XL  (Sheldrick, 2008)'
_computing_structure_solution    'SHELXT 2018/2 (Sheldrick, 2018)'
_diffrn_ambient_temperature      100
_diffrn_detector                 'CCD area detector'
_diffrn_detector_area_resol_mean 8.3
_diffrn_detector_type            'Bruker APEX2 CCD'
_diffrn_measured_fraction_theta_full 0.996
_diffrn_measured_fraction_theta_max 0.994
_diffrn_measurement_device       'three-circle diffractometer'
_diffrn_measurement_device_type  'Bruker Smart APEX'
_diffrn_measurement_method       '\w scans'
_diffrn_radiation_collimation    'Focusing mirrors'
_diffrn_radiation_monochromator  'Quazar MX Mirror Optics'
_diffrn_radiation_probe          x-ray
_diffrn_radiation_type           'Cu K\a'
_diffrn_radiation_wavelength     1.54178
_diffrn_reflns_av_R_equivalents  0.0243
_diffrn_reflns_av_unetI/netI     0.0118
_diffrn_reflns_Laue_measured_fraction_full 0.996
_diffrn_reflns_Laue_measured_fraction_max 0.994
_diffrn_reflns_limit_h_max       6
_diffrn_reflns_limit_h_min       -7
_diffrn_reflns_limit_k_max       9
_diffrn_reflns_limit_k_min       -9
_diffrn_reflns_limit_l_max       16
_diffrn_reflns_limit_l_min       -16
_diffrn_reflns_number            12462
_diffrn_reflns_point_group_measured_fraction_full 0.996
_diffrn_reflns_point_group_measured_fraction_max 0.994
_diffrn_reflns_theta_full        67.679
_diffrn_reflns_theta_max         71.660
_diffrn_reflns_theta_min         6.430
_diffrn_source                   'Microfocus Source'
_diffrn_source_current           0.65
_diffrn_source_power             0.02912
_diffrn_source_target            Cu
_diffrn_source_type              'Incoatec I\mS High Brilliance Microsource'
_diffrn_source_voltage           44.8
_exptl_absorpt_coefficient_mu    7.890
_exptl_absorpt_correction_T_max  0.2768
_exptl_absorpt_correction_T_min  0.1338
_exptl_absorpt_correction_type   multi-scan
_exptl_absorpt_process_details
;
SADABS-2016/2 (Bruker,2016/2) was used for absorption correction.
wR2(int) was 0.1558 before and 0.0346 after correction.
The Ratio of minimum to maximum transmission is 0.4834.
The \l/2 correction factor is Not present.
;
_exptl_crystal_colour            'clear light colourless'
_exptl_crystal_colour_lustre     clear
_exptl_crystal_colour_modifier   light
_exptl_crystal_colour_primary    colourless
_exptl_crystal_density_diffrn    1.811
_exptl_crystal_description       needle
_exptl_crystal_F_000             340
_exptl_crystal_recrystallization_method
'crystallized from  H2O / DMSO on a microscope plate'
_exptl_crystal_size_max          0.25
_exptl_crystal_size_mid          0.08
_exptl_crystal_size_min          0.08
_refine_diff_density_max         0.328
_refine_diff_density_min         -0.246
_refine_diff_density_rms         0.065
_refine_ls_extinction_coef       .
_refine_ls_extinction_method     none
_refine_ls_goodness_of_fit_ref   1.154
_refine_ls_hydrogen_treatment    refall
_refine_ls_matrix_type           full
_refine_ls_number_parameters     101
_refine_ls_number_reflns         1236
_refine_ls_number_restraints     0
_refine_ls_restrained_S_all      1.154
_refine_ls_R_factor_all          0.0188
_refine_ls_R_factor_gt           0.0188
_refine_ls_shift/su_max          0.001
_refine_ls_shift/su_mean         0.000
_refine_ls_structure_factor_coef Fsqd
_refine_ls_weighting_details
'w=1/[\s^2^(Fo^2^)+(0.0286P)^2^+0.4194P] where P=(Fo^2^+2Fc^2^)/3'
_refine_ls_weighting_scheme      calc
_refine_ls_wR_factor_gt          0.0510
_refine_ls_wR_factor_ref         0.0510
_reflns_Friedel_coverage         0.000
_reflns_Friedel_fraction_full    .
_reflns_Friedel_fraction_max     .
_reflns_number_gt                1235
_reflns_number_total             1236
_reflns_threshold_expression     'I > 2\s(I)'
_cod_data_source_file            S06_Pq-Br2_P21_c.cif
_cod_data_source_block           jw22651
_cod_database_code               4519452
_cod_database_fobs_code 4519452