A near-room-temperature organic-inorganic hybrid molecular ferroelectric: [C6H5CH2CH2NH3]2[CdI4]
Huang, Bo; Sun, Lin-Ying; Wang, Sha-Sha; Zhang, Jianyu; Ji, Chengmin; Luo, Junhua; Zhang, Wei-Xiong; Chen, Xiao-Ming; Chem. Commun.  (2017) –; doi:10.1039/C7CC02408H

data_7120071
_publ_section_title
;
 A near-room-temperature organic-inorganic hybrid molecular ferroelectric:
 [C6H5CH2CH2NH3]2[CdI4]
;
_journal_name_full               'Chem. Commun.'
_journal_paper_doi               10.1039/C7CC02408H
_journal_year                    2017
_chemical_formula_moiety         'Cd I4, 2(C8 H12 N)'
_chemical_formula_sum            'C16 H24 Cd I4 N2'
_chemical_formula_weight         864.37
_space_group_crystal_system      monoclinic
_space_group_IT_number           11
_space_group_name_Hall           '-P 2yb'
_space_group_name_H-M_alt        'P 1 21/m 1'
_symmetry_space_group_name_Hall  '-P 2yb'
_symmetry_space_group_name_H-M   'P 1 21/m 1'
_atom_sites_solution_hydrogens   geom
_audit_creation_date             2017-03-05
_audit_creation_method
;
Olex2 1.2
(compiled 2017.03.02 svn.r3394 for OlexSys, GUI svn.r5324)
;
_audit_update_record
;
2017-03-16 deposited with the CCDC.
2017-05-04 downloaded from the CCDC.
;
_cell_angle_alpha                90
_cell_angle_beta                 98.521(4)
_cell_angle_gamma                90
_cell_formula_units_Z            2
_cell_length_a                   10.8728(17)
_cell_length_b                   8.4539(11)
_cell_length_c                   13.6191(18)
_cell_measurement_reflns_used    6518
_cell_measurement_temperature    320(2)
_cell_measurement_theta_max      27.45
_cell_measurement_theta_min      3.02
_cell_volume                     1238.0(3)
_computing_molecular_graphics    'Olex2 (Dolomanov et al., 2009)'
_computing_publication_material  'Olex2 (Dolomanov et al., 2009)'
_computing_structure_refinement  'ShelXL (Sheldrick, 2015)'
_diffrn_ambient_temperature      320(2)
_diffrn_measured_fraction_theta_full 0.973
_diffrn_measured_fraction_theta_max 0.974
_diffrn_measurement_device_type  'multiwire proportional'
_diffrn_measurement_method       'phi and omega scans'
_diffrn_radiation_monochromator  graphite
_diffrn_radiation_type           MoK\a
_diffrn_radiation_wavelength     0.71073
_diffrn_reflns_av_R_equivalents  0.0563
_diffrn_reflns_av_unetI/netI     0.0519
_diffrn_reflns_Laue_measured_fraction_full 0.973
_diffrn_reflns_Laue_measured_fraction_max 0.974
_diffrn_reflns_limit_h_max       13
_diffrn_reflns_limit_h_min       -10
_diffrn_reflns_limit_k_max       10
_diffrn_reflns_limit_k_min       -9
_diffrn_reflns_limit_l_max       16
_diffrn_reflns_limit_l_min       -16
_diffrn_reflns_number            6876
_diffrn_reflns_point_group_measured_fraction_full 0.973
_diffrn_reflns_point_group_measured_fraction_max 0.974
_diffrn_reflns_theta_full        25.242
_diffrn_reflns_theta_max         25.995
_diffrn_reflns_theta_min         3.025
_exptl_absorpt_coefficient_mu    5.870
_exptl_absorpt_correction_type   multi-scan
_exptl_absorpt_process_details   ABSCOR
_exptl_crystal_colour            colorless
_exptl_crystal_density_diffrn    2.319
_exptl_crystal_description       block
_exptl_crystal_F_000             788
_exptl_crystal_size_max          0.3
_exptl_crystal_size_mid          0.3
_exptl_crystal_size_min          0.2
_exptl_transmission_factor_max   1.000000
_exptl_transmission_factor_min   0.273454
_refine_diff_density_max         1.145
_refine_diff_density_min         -2.148
_refine_diff_density_rms         0.322
_refine_ls_extinction_method     none
_refine_ls_goodness_of_fit_ref   1.221
_refine_ls_hydrogen_treatment    constr
_refine_ls_matrix_type           full
_refine_ls_number_parameters     171
_refine_ls_number_reflns         2538
_refine_ls_number_restraints     118
_refine_ls_restrained_S_all      1.202
_refine_ls_R_factor_all          0.0820
_refine_ls_R_factor_gt           0.0704
_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^)+(0.0862P)^2^+8.8105P] where P=(Fo^2^+2Fc^2^)/3'
_refine_ls_weighting_scheme      calc
_refine_ls_wR_factor_gt          0.1979
_refine_ls_wR_factor_ref         0.2099
_reflns_Friedel_coverage         0.000
_reflns_number_gt                2101
_reflns_number_total             2538
_reflns_threshold_expression     'I > 2\s(I)'
_cod_data_source_file            c7cc02408h2.cif
_cod_data_source_block           z
_cod_database_code               7120071
_shelx_shelxl_version_number     2016/6
_shelx_estimated_absorpt_t_max   1.000
_shelx_estimated_absorpt_t_min   0.273
_olex2_refinement_description
;
1. Fixed Uiso
 At 1.2 times of:
  All C(H) groups, All C(H,H) groups, All N(H,H,H) groups
2. Restrained distances
 C9-C10 = C10-C11 = C1-C2 = C2-C3
 1.5 with sigma of 0.02
 N1-C1 = N2-C9
 1.47 with sigma of 0.02
 N1-C2 = C1-C3 = N2-C10 = C9-C11
 2.52 with sigma of 0.02
3. Uiso/Uaniso restraints and constraints
N1 \\sim C1 \\sim C2 \\sim C3 \\sim C4 \\sim C5 \\sim C6 \\sim C7 \\sim C8
\\sim N2 \\sim C9 \\sim C10 \\sim C11 \\sim C12 \\sim C13 \\sim C14 \\sim C15
\\sim C16: within 1.6A with sigma of 0.02 and sigma for terminal atoms of 0.04
4. Others
 Fixed Sof: I3(0.5) N1(0.5) H1A(0.5) H1B(0.5) H1C(0.5) C1(0.5) H1D(0.5)
 H1E(0.5) C2(0.5) H2A(0.5) H2B(0.5) C3(0.5) C4(0.5) H4(0.5) C5(0.5) H5(0.5)
 C6(0.5) H6(0.5) C7(0.5) H7(0.5) C8(0.5) H8(0.5) N2(0.5) H2C(0.5) H2D(0.5)
 H2E(0.5) C9(0.5) H9A(0.5) H9B(0.5) C10(0.5) H10A(0.5) H10B(0.5) C11(0.5)
 C12(0.5) H12(0.5) C13(0.5) H13(0.5) C14(0.5) H14(0.5) C15(0.5) H15(0.5)
 C16(0.5) H16(0.5)
5.a Secondary CH2 refined with riding coordinates:
 C1(H1D,H1E), C2(H2A,H2B), C9(H9A,H9B), C10(H10A,H10B)
5.b Aromatic/amide H refined with riding coordinates:
 C4(H4), C5(H5), C6(H6), C7(H7), C8(H8), C12(H12), C13(H13), C14(H14),
 C15(H15), C16(H16)
5.c Fitted hexagon refined as free rotating group:
 C3(C4,C5,C6,C7,C8), C11(C12,C13,C14,C15,C16)
5.d Idealised Me refined as rotating group:
 N1(H1A,H1B,H1C), N2(H2C,H2D,H2E)
;
_shelx_res_checksum              81460
_olex2_submission_special_instructions 'No special instructions were received'