Exceptional structural phase transition near room temperature in an organic-inorganic hybrid ferroelectric
Wang, Ping; Tong, Yu-Qiao; Yin, Shi Qing; Gu, Qian Jun; Huang, Bo; Zhu, Ai-Xin; Chemical Communications  (2023) –; doi:10.1039/D3CC04186G

data_7132249
_publ_section_title
;
 Exceptional structural phase transition near room temperature in an
 organic-inorganic hybrid ferroelectric
;
_journal_name_full               'Chemical Communications'
_journal_paper_doi               10.1039/D3CC04186G
_journal_year                    2023
_chemical_formula_moiety         'Hg I4, 2(C8 H12 N)'
_chemical_formula_sum            'C16 H24 Hg I4 N2'
_chemical_formula_weight         952.56
_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   geom
_atom_sites_solution_primary     iterative
_audit_creation_date             2023-05-05
_audit_creation_method
;
Olex2 1.2
(compiled 2018.05.29 svn.r3508 for OlexSys, GUI svn.r5506)
;
_audit_update_record
;
2023-09-20 deposited with the CCDC.	2023-10-24 downloaded from the CCDC.
;
_cell_angle_alpha                90
_cell_angle_beta                 98.605(3)
_cell_angle_gamma                90
_cell_formula_units_Z            4
_cell_length_a                   10.8622(9)
_cell_length_b                   8.4041(7)
_cell_length_c                   27.147(2)
_cell_measurement_reflns_used    4933
_cell_measurement_temperature    330(2)
_cell_measurement_theta_max      25.92
_cell_measurement_theta_min      2.24
_cell_volume                     2450.3(3)
_computing_cell_refinement       'SAINT V8.40B (?, 2016)'
_computing_data_reduction        'SAINT V8.40B (?, 2016)'
_computing_molecular_graphics    'Olex2 (Dolomanov et al., 2009)'
_computing_publication_material  'Olex2 (Dolomanov et al., 2009)'
_computing_structure_refinement  'ShelXL (Sheldrick, 2015)'
_computing_structure_solution    'olex2.solve (Bourhis et al., 2015)'
_diffrn_ambient_temperature      330.4
_diffrn_measured_fraction_theta_full 0.992
_diffrn_measured_fraction_theta_max 0.994
_diffrn_measurement_device_type  'CCD area detector'
_diffrn_measurement_method       'phi and omega scans'
_diffrn_radiation_type           MoK\a
_diffrn_radiation_wavelength     0.71073
_diffrn_reflns_av_R_equivalents  0.0369
_diffrn_reflns_av_unetI/netI     0.0326
_diffrn_reflns_Laue_measured_fraction_full 0.992
_diffrn_reflns_Laue_measured_fraction_max 0.994
_diffrn_reflns_limit_h_max       13
_diffrn_reflns_limit_h_min       -11
_diffrn_reflns_limit_k_max       10
_diffrn_reflns_limit_k_min       -10
_diffrn_reflns_limit_l_max       34
_diffrn_reflns_limit_l_min       -34
_diffrn_reflns_number            21645
_diffrn_reflns_point_group_measured_fraction_full 0.992
_diffrn_reflns_point_group_measured_fraction_max 0.994
_diffrn_reflns_theta_full        25.242
_diffrn_reflns_theta_max         27.000
_diffrn_reflns_theta_min         1.896
_exptl_absorpt_coefficient_mu    11.323
_exptl_absorpt_correction_T_max  0.104
_exptl_absorpt_correction_T_min  0.083
_exptl_absorpt_correction_type   multi-scan
_exptl_absorpt_process_details   ABSCOR
_exptl_crystal_colour            light
_exptl_crystal_density_diffrn    2.582
_exptl_crystal_density_method    'not measured'
_exptl_crystal_description       block
_exptl_crystal_F_000             1704
_exptl_crystal_size_max          0.3
_exptl_crystal_size_mid          0.2
_exptl_crystal_size_min          0.2
_refine_diff_density_max         0.867
_refine_diff_density_min         -0.830
_refine_diff_density_rms         0.104
_refine_ls_extinction_method     none
_refine_ls_goodness_of_fit_ref   1.008
_refine_ls_hydrogen_treatment    constr
_refine_ls_matrix_type           full
_refine_ls_number_parameters     216
_refine_ls_number_reflns         5326
_refine_ls_number_restraints     178
_refine_ls_restrained_S_all      1.010
_refine_ls_R_factor_all          0.0820
_refine_ls_R_factor_gt           0.0416
_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^)+(0.0309P)^2^+8.3377P] where P=(Fo^2^+2Fc^2^)/3'
_refine_ls_weighting_scheme      calc
_refine_ls_wR_factor_gt          0.0830
_refine_ls_wR_factor_ref         0.1017
_reflns_Friedel_coverage         0.000
_reflns_number_gt                3160
_reflns_number_total             5326
_reflns_threshold_expression     'I > 2\s(I)'
_cod_data_source_file            d3cc04186g2.cif
_cod_data_source_block           a
_cod_original_cell_volume        2450.2(3)
_cod_database_code               7132249
_shelx_shelxl_version_number     2016/6
_olex2_refinement_description
;
1. Fixed Uiso
 At 1.2 times of:
  All C(H) groups, All C(H,H) groups, All C(H,H,H,H) groups, All N(H,H,H) groups
2. Restrained distances
 C1-C2 = C1-C2' = C3-C2 = C3-C2'
 1.53 with sigma of 0.02
3. Uiso/Uaniso restraints and constraints
N1 \\sim C1 \\sim C2 \\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 2.4A with sigma of 0.02 and sigma for terminal
atoms of 0.04
4. Others
 Fixed Sof: I1(0.5) I1'(0.5) H1AA(0.5) H1AB(0.5) H1BC(0.5) H1BD(0.5) C2(0.5)
 H2A(0.5) H2B(0.5) C2'(0.5) H2'A(0.5) H2'B(0.5)
5.a Secondary CH2 refined with riding coordinates:
 C1(H1AA,H1AB), C1(H1BC,H1BD), C2(H2A,H2B), C2'(H2'A,H2'B), 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)
5.d Idealised Me refined as rotating group:
 N1(H1A,H1B,H1C), N2(H2C,H2D,H2E)
;
_shelx_res_checksum              28918
_shelx_hkl_checksum              29712
_olex2_submission_special_instructions 'No special instructions were received'