Two-Dimensional Organic-Inorganic Hybrid Rare-Earth Double Perovskite Ferroelectrics.
Shi, Chao; Ye, Le; Gong, Zhi-Xin; Ma, Jia-Jun; Wang, Qin-Wen; Jiang, Jia-Ying; Hua, Miao-Miao; Wang, Chang-Feng; Yu, Hui; Zhang, Yi; Ye, Heng-Yun; Journal of the American Chemical Society  (2019) –; doi:10.1021/jacs.9b11697

data_4133847
_publ_section_title
;
 Two-Dimensional Organic-Inorganic Hybrid Rare-Earth Double Perovskite
 Ferroelectrics.
;
_journal_name_full               'Journal of the American Chemical Society'
_journal_paper_doi               10.1021/jacs.9b11697
_journal_year                    2019
_chemical_absolute_configuration syn
_chemical_formula_sum            'C24 H56 Ce K N12 O28'
_chemical_formula_weight         1140.02
_space_group_crystal_system      orthorhombic
_space_group_IT_number           21
_space_group_name_Hall           'B 2 2'
_space_group_name_H-M_alt        'B 2 2 2'
_audit_creation_method           SHELXL-2017/1
_cell_angle_alpha                90
_cell_angle_beta                 90
_cell_angle_gamma                90
_cell_formula_units_Z            2
_cell_length_a                   9.9301(3)
_cell_length_b                   9.8678(3)
_cell_length_c                   24.3846(8)
_cell_measurement_reflns_used    7480
_cell_measurement_temperature    343(2)
_cell_measurement_theta_max      29.0100
_cell_measurement_theta_min      2.0520
_cell_volume                     2389.40(13)
_computing_structure_refinement  'SHELXL-2017/1 (Sheldrick, 2017)'
_diffrn_ambient_temperature      343(2)
_diffrn_measured_fraction_theta_full 0.998
_diffrn_measured_fraction_theta_max 0.873
_diffrn_measurement_device_type  'rigaku synergy'
_diffrn_radiation_type           MoK\a
_diffrn_radiation_wavelength     0.71073
_diffrn_reflns_av_R_equivalents  0.0306
_diffrn_reflns_av_unetI/netI     0.0305
_diffrn_reflns_Laue_measured_fraction_full 0.998
_diffrn_reflns_Laue_measured_fraction_max 0.873
_diffrn_reflns_limit_h_max       14
_diffrn_reflns_limit_h_min       -12
_diffrn_reflns_limit_k_max       12
_diffrn_reflns_limit_k_min       -14
_diffrn_reflns_limit_l_max       31
_diffrn_reflns_limit_l_min       -34
_diffrn_reflns_number            10228
_diffrn_reflns_point_group_measured_fraction_full 0.995
_diffrn_reflns_point_group_measured_fraction_max 0.834
_diffrn_reflns_theta_full        25.242
_diffrn_reflns_theta_max         31.396
_diffrn_reflns_theta_min         2.064
_exptl_absorpt_coefficient_mu    1.139
_exptl_absorpt_correction_T_max  1.00000
_exptl_absorpt_correction_T_min  0.89406
_exptl_absorpt_correction_type   multi-scan
_exptl_crystal_colour            colorless
_exptl_crystal_density_diffrn    1.585
_exptl_crystal_description       block
_exptl_crystal_F_000             1170
_exptl_crystal_size_max          0.17
_exptl_crystal_size_mid          0.15
_exptl_crystal_size_min          0.13
_refine_diff_density_max         1.039
_refine_diff_density_min         -0.808
_refine_diff_density_rms         0.141
_refine_ls_abs_structure_details
;
 Flack x determined using 1203 quotients [(I+)-(I-)]/[(I+)+(I-)]
 (Parsons, Flack and Wagner, Acta Cryst. B69 (2013) 249-259).
;
_refine_ls_abs_structure_Flack   0.48(2)
_refine_ls_extinction_method     none
_refine_ls_goodness_of_fit_ref   0.981
_refine_ls_hydrogen_treatment    undef
_refine_ls_matrix_type           full
_refine_ls_number_parameters     195
_refine_ls_number_reflns         3312
_refine_ls_number_restraints     81
_refine_ls_restrained_S_all      1.007
_refine_ls_R_factor_all          0.0573
_refine_ls_R_factor_gt           0.0541
_refine_ls_shift/su_max          0.000
_refine_ls_shift/su_mean         0.000
_refine_ls_structure_factor_coef Fsqd
_refine_ls_weighting_details
'w=1/[\s^2^(Fo^2^)+(0.1169P)^2^] where P=(Fo^2^+2Fc^2^)/3'
_refine_ls_weighting_scheme      calc
_refine_ls_wR_factor_gt          0.1367
_refine_ls_wR_factor_ref         0.1397
_reflns_Friedel_coverage         0.702
_reflns_Friedel_fraction_full    0.991
_reflns_Friedel_fraction_max     0.785
_reflns_number_gt                3101
_reflns_number_total             3312
_reflns_threshold_expression     'I > 2\s(I)'
_cod_data_source_file            ja9b11697_si_002.cif
_cod_data_source_block           (S3HQ)4KCe(NO3)8-T343K
_cod_database_code               4133847
_shelx_shelxl_version_number     2017/1
_shelx_res_checksum              11547
_shelx_hkl_checksum              95101