Homomeric Chains of intermolecular bonds scaffold octahedral germanium perovskites
Morteza Najarian, Amin; Dinic, Filip; Chen, Hao; Sabatini, Randy; Zheng, Chao; Lough, Alan J.; Maris, Thierry; Saidaminov, Makhsud I.; Garcia de Arquer, F. Pelayo; Voznyy, Oleksandr; Hoogland, Sjoerd; Sargent, Edward H.; Nature 620 (2023) 328–335; doi:10.1038/s41586-023-06209-y

data_1570728
_publ_section_title
;
 Homomeric Chains of intermolecular bonds scaffold octahedral germanium
 perovskites
;
_journal_name_full               Nature
_journal_page_first              328
_journal_page_last               335
_journal_paper_doi               10.1038/s41586-023-06209-y
_journal_volume                  620
_journal_year                    2023
_chemical_formula_moiety         'Ge I4, 2(C8 H8 F3 N)'
_chemical_formula_sum            'C16 H16 F6 Ge I4 N2'
_chemical_formula_weight         930.50
_chemical_name_systematic
;        
catena-[bis[4-(trifluoromethyl)benzylammonium] 
bis(m-iodo)-bis(iodo)-germanium(ii)]
;
_space_group_crystal_system      orthorhombic
_space_group_IT_number           33
_space_group_name_Hall           'P 2c -2n'
_space_group_name_H-M_alt        'P n a 21'
_atom_sites_solution_hydrogens   geom
_atom_sites_solution_primary     direct
_cell_angle_alpha                90
_cell_angle_beta                 90
_cell_angle_gamma                90
_cell_formula_units_Z            4
_cell_length_a                   35.387(3)
_cell_length_b                   8.3595(8)
_cell_length_c                   8.5792(8)
_cell_measurement_reflns_used    4170
_cell_measurement_temperature    273(2)
_cell_measurement_theta_max      26.78
_cell_measurement_theta_min      3.31
_cell_volume                     2537.9(4)
_computing_cell_refinement       'Bruker SAINT'
_computing_data_collection       'Bruker APEX3'
_computing_data_reduction        'Bruker SAINT'
_computing_structure_refinement  'SHELXL-2018/3 (Sheldrick, 2018)'
_computing_structure_solution
; 
 SHELXT 2014/5 (Sheldrick, 2014)
;
_diffrn_ambient_temperature      273(2)
_diffrn_measured_fraction_theta_full 0.994
_diffrn_measured_fraction_theta_max 0.995
_diffrn_measurement_device_type  'Bruker APEX-II CCD'
_diffrn_measurement_method       '\w and \phi scans'
_diffrn_radiation_monochromator  graphite
_diffrn_radiation_type           MoK\a
_diffrn_radiation_wavelength     0.71073
_diffrn_reflns_av_R_equivalents  0.0625
_diffrn_reflns_av_unetI/netI     0.0855
_diffrn_reflns_Laue_measured_fraction_full 0.994
_diffrn_reflns_Laue_measured_fraction_max 0.995
_diffrn_reflns_limit_h_max       28
_diffrn_reflns_limit_h_min       -45
_diffrn_reflns_limit_k_max       10
_diffrn_reflns_limit_k_min       -10
_diffrn_reflns_limit_l_max       10
_diffrn_reflns_limit_l_min       -6
_diffrn_reflns_number            9606
_diffrn_reflns_theta_full        25.242
_diffrn_reflns_theta_max         27.101
_diffrn_reflns_theta_min         1.151
_exptl_absorpt_coefficient_mu    6.122
_exptl_absorpt_correction_T_max  0.745686
_exptl_absorpt_correction_T_min  0.514223
_exptl_absorpt_correction_type   multi-scan
_exptl_absorpt_process_details   SADABS
_exptl_crystal_colour            orange
_exptl_crystal_density_diffrn    2.435
_exptl_crystal_description       plate
_exptl_crystal_F_000             1696
_exptl_crystal_size_max          0.191
_exptl_crystal_size_mid          0.142
_exptl_crystal_size_min          0.043
_refine_diff_density_max         1.251
_refine_diff_density_min         -1.129
_refine_diff_density_rms         0.269
_refine_ls_abs_structure_details
;
 Refined as an inversion twin.
;
_refine_ls_abs_structure_Flack   0.29(8)
_refine_ls_extinction_coef       .
_refine_ls_extinction_method     none
_refine_ls_goodness_of_fit_ref   1.025
_refine_ls_hydrogen_treatment    constr
_refine_ls_matrix_type           full
_refine_ls_number_parameters     263
_refine_ls_number_reflns         4312
_refine_ls_number_restraints     202
_refine_ls_restrained_S_all      1.009
_refine_ls_R_factor_all          0.0903
_refine_ls_R_factor_gt           0.0582
_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^)+(0.0652P)^2^+2.5038P] where P=(Fo^2^+2Fc^2^)/3'
_refine_ls_weighting_scheme      calc
_refine_ls_wR_factor_gt          0.1351
_refine_ls_wR_factor_ref         0.1520
_reflns_Friedel_coverage         0.450
_reflns_Friedel_fraction_full    0.561
_reflns_Friedel_fraction_max     0.514
_reflns_number_gt                2972
_reflns_number_total             4312
_reflns_threshold_expression     'I > 2\s(I)'
_cod_data_source_file            04-_4CF3-PMA_2GeI4.cif
_cod_data_source_block           S1199
_cod_database_code               1570728