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_4133848
_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_formula_sum            'C28 H56 Ce K N12 O28'
_chemical_formula_weight         1188.06
_space_group_crystal_system      orthorhombic
_space_group_IT_number           65
_space_group_name_Hall           '-C 2 2'
_space_group_name_H-M_alt        'C m m m'
_audit_creation_method           SHELXL-2014/7
_cell_angle_alpha                90
_cell_angle_beta                 90
_cell_angle_gamma                90
_cell_formula_units_Z            2
_cell_length_a                   9.9132(4)
_cell_length_b                   24.2676(9)
_cell_length_c                   9.8306(3)
_cell_measurement_reflns_used    6182
_cell_measurement_temperature    293(2)
_cell_measurement_theta_max      30.7820
_cell_measurement_theta_min      2.2030
_cell_volume                     2364.94(15)
_computing_structure_refinement  'SHELXL-2014/7 (Sheldrick, 2014)'
_diffrn_ambient_temperature      293(2)
_diffrn_measured_fraction_theta_full 0.998
_diffrn_measured_fraction_theta_max 0.859
_diffrn_measurement_device_type  'RIGAKY SYNERGY'
_diffrn_radiation_type           MoK\a
_diffrn_radiation_wavelength     0.71073
_diffrn_reflns_av_R_equivalents  0.0291
_diffrn_reflns_av_unetI/netI     0.0252
_diffrn_reflns_Laue_measured_fraction_full 0.998
_diffrn_reflns_Laue_measured_fraction_max 0.859
_diffrn_reflns_limit_h_max       13
_diffrn_reflns_limit_h_min       -10
_diffrn_reflns_limit_k_max       34
_diffrn_reflns_limit_k_min       -30
_diffrn_reflns_limit_l_max       14
_diffrn_reflns_limit_l_min       -13
_diffrn_reflns_number            8458
_diffrn_reflns_point_group_measured_fraction_full 0.998
_diffrn_reflns_point_group_measured_fraction_max 0.859
_diffrn_reflns_theta_full        25.242
_diffrn_reflns_theta_max         31.617
_diffrn_reflns_theta_min         2.072
_exptl_absorpt_coefficient_mu    1.155
_exptl_absorpt_correction_T_max  1.00000
_exptl_absorpt_correction_T_min  0.82433
_exptl_absorpt_correction_type   multi-scan
_exptl_crystal_colour            COLORLESS
_exptl_crystal_density_diffrn    1.668
_exptl_crystal_description       BLOCK
_exptl_crystal_F_000             1218
_exptl_crystal_size_max          0.17
_exptl_crystal_size_mid          0.14
_exptl_crystal_size_min          0.11
_refine_diff_density_max         1.001
_refine_diff_density_min         -0.685
_refine_diff_density_rms         0.130
_refine_ls_extinction_method     none
_refine_ls_goodness_of_fit_ref   1.087
_refine_ls_hydrogen_treatment    undef
_refine_ls_matrix_type           full
_refine_ls_number_parameters     138
_refine_ls_number_reflns         1934
_refine_ls_number_restraints     31
_refine_ls_restrained_S_all      1.096
_refine_ls_R_factor_all          0.0541
_refine_ls_R_factor_gt           0.0521
_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^)+(0.1043P)^2^] where P=(Fo^2^+2Fc^2^)/3'
_refine_ls_weighting_scheme      calc
_refine_ls_wR_factor_gt          0.1329
_refine_ls_wR_factor_ref         0.1344
_reflns_Friedel_coverage         0.000
_reflns_number_gt                1857
_reflns_number_total             1934
_reflns_threshold_expression     'I > 2\s(I)'
_cod_data_source_file            ja9b11697_si_002.cif
_cod_data_source_block           (Rac3HQ)4KCe(NO3)8-T293K
_cod_database_code               4133848
_shelx_shelxl_version_number     2014/7
_shelx_res_checksum              25226
_shelx_hkl_checksum              61170