Two-step thermotropic phase transition and dielectric relaxation in 1D supramolecular lead iodide perovskite [NH4@18-crown ether]PbI3
Xie, Yu-Xin; Yuan, Guo-Jun; Miao, Ji-Bin; Luan, Ye-Ting; Li, Li; Chen, Hong; Ren, Xiaoming; Dalton Transactions  (2022) –; doi:10.1039/D2DT02621J

data_7711257
_publ_section_title
;
 Two-step thermotropic phase transition and dielectric relaxation in 1D
 supramolecular lead iodide perovskite [NH4@18-crown ether]PbI3
;
_journal_name_full               'Dalton Transactions'
_journal_paper_doi               10.1039/D2DT02621J
_journal_year                    2022
_chemical_formula_sum            'C12 H28 I3 N O6 Pb'
_chemical_formula_weight         870.24
_space_group_crystal_system      monoclinic
_space_group_IT_number           14
_space_group_name_Hall           '-P 2yn'
_space_group_name_H-M_alt        'P 1 21/n 1'
_atom_sites_solution_hydrogens   mixed
_audit_creation_method           SHELXL-2018/3
_audit_update_record
;
2022-03-10 deposited with the CCDC.	2022-09-13 downloaded from the CCDC.
;
_cell_angle_alpha                90
_cell_angle_beta                 93.858(2)
_cell_angle_gamma                90
_cell_formula_units_Z            4
_cell_length_a                   15.9408(9)
_cell_length_b                   8.4144(4)
_cell_length_c                   17.7939(10)
_cell_measurement_reflns_used    17863
_cell_measurement_temperature    363(2)
_cell_measurement_theta_max      25.009
_cell_measurement_theta_min      2.294
_cell_volume                     2381.3(2)
_computing_structure_refinement  'SHELXL-2018/3 (Sheldrick, 2018)'
_computing_structure_solution    'SHELXT 2014/5 (Sheldrick, 2014)'
_diffrn_ambient_temperature      363(2)
_diffrn_measured_fraction_theta_full 0.994
_diffrn_measured_fraction_theta_max 0.994
_diffrn_measurement_device_type  'CCD area detector'
_diffrn_radiation_type           MoK\a
_diffrn_radiation_wavelength     0.71073
_diffrn_reflns_av_R_equivalents  0.0657
_diffrn_reflns_av_unetI/netI     0.0580
_diffrn_reflns_Laue_measured_fraction_full 0.994
_diffrn_reflns_Laue_measured_fraction_max 0.994
_diffrn_reflns_limit_h_max       18
_diffrn_reflns_limit_h_min       -17
_diffrn_reflns_limit_k_max       10
_diffrn_reflns_limit_k_min       -9
_diffrn_reflns_limit_l_max       21
_diffrn_reflns_limit_l_min       -21
_diffrn_reflns_number            17863
_diffrn_reflns_point_group_measured_fraction_full 0.994
_diffrn_reflns_point_group_measured_fraction_max 0.994
_diffrn_reflns_theta_full        25.009
_diffrn_reflns_theta_max         25.009
_diffrn_reflns_theta_min         2.294
_exptl_absorpt_coefficient_mu    10.996
_exptl_crystal_colour            yellow
_exptl_crystal_density_diffrn    2.427
_exptl_crystal_description       rod
_exptl_crystal_F_000             1584
_exptl_crystal_size_max          0.210
_exptl_crystal_size_mid          0.200
_exptl_crystal_size_min          0.190
_refine_diff_density_max         0.948
_refine_diff_density_min         -0.893
_refine_diff_density_rms         0.150
_refine_ls_extinction_coef       0.00254(11)
_refine_ls_extinction_expression Fc^*^=kFc[1+0.001xFc^2^\l^3^/sin(2\q)]^-1/4^
_refine_ls_extinction_method     'SHELXL-2018/3 (Sheldrick 2018)'
_refine_ls_goodness_of_fit_ref   1.026
_refine_ls_hydrogen_treatment    constr
_refine_ls_matrix_type           full
_refine_ls_number_parameters     372
_refine_ls_number_reflns         4166
_refine_ls_number_restraints     540
_refine_ls_restrained_S_all      0.983
_refine_ls_R_factor_all          0.0700
_refine_ls_R_factor_gt           0.0422
_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^)+(0.0313P)^2^+8.5108P] where P=(Fo^2^+2Fc^2^)/3'
_refine_ls_weighting_scheme      calc
_refine_ls_wR_factor_gt          0.0880
_refine_ls_wR_factor_ref         0.0986
_reflns_Friedel_coverage         0.000
_reflns_number_gt                2893
_reflns_number_total             4166
_reflns_threshold_expression     'I > 2\s(I)'
_cod_data_source_file            d2dt02621j1.cif
_cod_data_source_block           1_CCDC1
_cod_original_sg_symbol_H-M      'P 21/n'
_cod_database_code               7711257
_shelx_shelxl_version_number     2018/3
_shelx_estimated_absorpt_t_min   0.206
_shelx_estimated_absorpt_t_max   0.229
_shelx_res_checksum              61105
_shelx_hkl_checksum              94046