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_1570738
_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_absolute_configuration ad
_chemical_formula_moiety         '3(C H3 N H3), 3(Ge I3)'
_chemical_formula_sum            'C3 H18 Ge3 I9 N3'
_chemical_formula_weight         1456.07
_chemical_name_common            'Methylammonium tris(iodo)-germanium'
_space_group_crystal_system      trigonal
_space_group_IT_number           160
_space_group_name_Hall           'R 3 -2"'
_space_group_name_H-M_alt        'R 3 m :H'
_atom_sites_solution_hydrogens   .
_audit_creation_method           SHELXL-2018/3
_cell_angle_alpha                90
_cell_angle_beta                 90
_cell_angle_gamma                120
_cell_formula_units_Z            1
_cell_length_a                   8.4602(10)
_cell_length_b                   8.4602(10)
_cell_length_c                   11.0201(16)
_cell_measurement_reflns_used    513
_cell_measurement_temperature    296(2)
_cell_measurement_theta_max      21.89
_cell_measurement_theta_min      3.34
_cell_volume                     683.09(15)
_computing_cell_refinement       APEX3
_computing_data_collection       'APEX3 (Bruker, 2018)'
_computing_data_reduction        'SAINT (Bruker, 2014)'
_computing_molecular_graphics    'PLATON (Spek, 2009)'
_computing_publication_material  'SHELXTL (Sheldrick, 2008)'
_computing_structure_refinement  'SHELXL-2018/3 (Sheldrick, 2015b)'
_computing_structure_solution    'SHELXT 2014/5 (Sheldrick, 2015a)'
_diffrn_ambient_temperature      296(2)
_diffrn_measured_fraction_theta_full 0.988
_diffrn_measured_fraction_theta_max 0.980
_diffrn_measurement_device_type  'Bruker Kappa APEX-DUO CCD'
_diffrn_measurement_method       '\f and \w scans'
_diffrn_radiation_type           MoK\a
_diffrn_radiation_wavelength     0.71073
_diffrn_reflns_av_R_equivalents  0.0395
_diffrn_reflns_av_unetI/netI     0.0463
_diffrn_reflns_Laue_measured_fraction_full 0.988
_diffrn_reflns_Laue_measured_fraction_max 0.980
_diffrn_reflns_limit_h_max       12
_diffrn_reflns_limit_h_min       -12
_diffrn_reflns_limit_k_max       11
_diffrn_reflns_limit_k_min       -11
_diffrn_reflns_limit_l_max       14
_diffrn_reflns_limit_l_min       -15
_diffrn_reflns_number            1965
_diffrn_reflns_point_group_measured_fraction_full 0.985
_diffrn_reflns_point_group_measured_fraction_max 0.923
_diffrn_reflns_theta_full        25.242
_diffrn_reflns_theta_max         31.503
_diffrn_reflns_theta_min         3.339
_diffrn_source                   'sealed tube with Bruker Triumph monochromator'
_exptl_absorpt_coefficient_mu    13.441
_exptl_absorpt_correction_T_max  0.7463
_exptl_absorpt_correction_T_min  0.6232
_exptl_absorpt_correction_type   multi-scan
_exptl_absorpt_process_details   'SADABS (Kause et al., 2015)'
_exptl_crystal_colour            red
_exptl_crystal_density_diffrn    3.540
_exptl_crystal_description       Shard
_exptl_crystal_F_000             630
_exptl_crystal_size_max          0.040
_exptl_crystal_size_mid          0.020
_exptl_crystal_size_min          0.010
_refine_diff_density_max         0.693
_refine_diff_density_min         -1.060
_refine_diff_density_rms         0.174
_refine_ls_abs_structure_details
; 
 Flack x determined using 157 quotients [(I+)-(I-)]/[(I+)+(I-)] 
 (Parsons, Flack and Wagner, Acta Cryst. B69 (2013) 249-259). 
;
_refine_ls_abs_structure_Flack   0.09(5)
_refine_ls_extinction_coef       .
_refine_ls_extinction_method     none
_refine_ls_goodness_of_fit_ref   1.078
_refine_ls_hydrogen_treatment    undef
_refine_ls_matrix_type           full
_refine_ls_number_parameters     15
_refine_ls_number_reflns         550
_refine_ls_number_restraints     1
_refine_ls_restrained_S_all      1.077
_refine_ls_R_factor_all          0.0680
_refine_ls_R_factor_gt           0.0338
_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^)+(0.0156P)^2^] where P=(Fo^2^+2Fc^2^)/3'
_refine_ls_weighting_scheme      calc
_refine_ls_wR_factor_gt          0.0472
_refine_ls_wR_factor_ref         0.0543
_reflns_Friedel_coverage         0.864
_reflns_Friedel_fraction_full    0.982
_reflns_Friedel_fraction_max     0.864
_reflns_number_gt                391
_reflns_number_total             550
_reflns_threshold_expression     'I > 2\s(I)'
_cod_data_source_file            14-MAGeI3.cif
_cod_data_source_block           ma
_cod_original_cell_volume        683.09(19)
_cod_original_sg_symbol_H-M      'R 3 m'
_cod_database_code               1570738