Reversible Isomerizations between 1,4-Digermabenzenes and 1,4-Digerma-Dewar-benzenes: Air-Stable Activators for Small Molecules.
Sugahara, Tomohiro; Guo, Jing-Dong; Hashizume, Daisuke; Sasamori, Takahiro; Tokitoh, Norihiro; Journal of the American Chemical Society 141 (2019) 2263–2267; doi:10.1021/jacs.9b00129

data_4128199
_publ_section_title
;
 Reversible Isomerizations between 1,4-Digermabenzenes and
 1,4-Digerma-Dewar-benzenes: Air-Stable Activators for Small Molecules.
;
_journal_issue                   6
_journal_name_full               'Journal of the American Chemical Society'
_journal_page_first              2263
_journal_page_last               2267
_journal_paper_doi               10.1021/jacs.9b00129
_journal_volume                  141
_journal_year                    2019
_chemical_formula_moiety         'C68 H118 Ge2 Si8'
_chemical_formula_sum            'C68 H118 Ge2 Si8'
_chemical_formula_weight         1305.52
_space_group_crystal_system      triclinic
_space_group_IT_number           2
_space_group_name_Hall           '-P 1'
_space_group_name_H-M_alt        'P -1'
_symmetry_space_group_name_Hall  '-P 1'
_symmetry_space_group_name_H-M   'P -1'
_atom_sites_solution_hydrogens   geom
_atom_sites_solution_primary     direct
_atom_sites_solution_secondary   difman
_audit_creation_method           SHELXL-2014/7
_cell_angle_alpha                93.649(2)
_cell_angle_beta                 90.967(2)
_cell_angle_gamma                95.407(2)
_cell_formula_units_Z            2
_cell_length_a                   11.8587(4)
_cell_length_b                   16.0807(5)
_cell_length_c                   20.2574(8)
_cell_measurement_reflns_used    63040
_cell_measurement_temperature    103(2)
_cell_measurement_theta_max      26.674
_cell_measurement_theta_min      1.275
_cell_volume                     3837.0(2)
_computing_cell_refinement       CrysAlisPro
_computing_data_collection       CrystalClear
_computing_data_reduction        CrysAlisPro
_computing_molecular_graphics    'Yadokari-XG 2011 (Wakita Nemoto et al., 2011)'
_computing_publication_material  'Yadokari-XG 2011 (Wakita,Nemoto et al., 2011)'
_computing_structure_refinement  'SHELXL-2014/7 (Sheldrick, 2014)'
_computing_structure_solution    SIR2004
_diffrn_ambient_temperature      103(2)
_diffrn_detector_area_resol_mean 28.5714
_diffrn_measured_fraction_theta_full 0.997
_diffrn_measured_fraction_theta_max 0.989
_diffrn_measurement_device_type  'Rigaku Saturn'
_diffrn_measurement_method       \w
_diffrn_radiation_type           MoK\a
_diffrn_radiation_wavelength     0.71069
_diffrn_reflns_av_R_equivalents  0.0482
_diffrn_reflns_av_unetI/netI     0.0287
_diffrn_reflns_Laue_measured_fraction_full 0.997
_diffrn_reflns_Laue_measured_fraction_max 0.989
_diffrn_reflns_limit_h_max       14
_diffrn_reflns_limit_h_min       -14
_diffrn_reflns_limit_k_max       20
_diffrn_reflns_limit_k_min       -19
_diffrn_reflns_limit_l_max       25
_diffrn_reflns_limit_l_min       -25
_diffrn_reflns_number            63040
_diffrn_reflns_point_group_measured_fraction_full 0.997
_diffrn_reflns_point_group_measured_fraction_max 0.989
_diffrn_reflns_theta_full        25.240
_diffrn_reflns_theta_max         26.674
_diffrn_reflns_theta_min         1.275
_diffrn_source                   'fine-focus sealed tube'
_exptl_absorpt_coefficient_mu    0.943
_exptl_absorpt_correction_T_max  0.937
_exptl_absorpt_correction_T_min  0.912
_exptl_absorpt_correction_type   multi-scan
_exptl_absorpt_process_details
;
 MULABS - Empirical Correction for Absorption Anisotropy.
 Blessing, R. H., Acta Cryst., A51, 33-38 (1995).
;
_exptl_crystal_colour            orange
_exptl_crystal_density_diffrn    1.130
_exptl_crystal_description       block
_exptl_crystal_F_000             1404
_exptl_crystal_size_max          0.100
_exptl_crystal_size_mid          0.100
_exptl_crystal_size_min          0.070
_refine_diff_density_max         0.810
_refine_diff_density_min         -0.862
_refine_diff_density_rms         0.102
_refine_ls_extinction_method     none
_refine_ls_goodness_of_fit_ref   1.072
_refine_ls_hydrogen_treatment    constr
_refine_ls_matrix_type           full
_refine_ls_number_parameters     760
_refine_ls_number_reflns         16005
_refine_ls_number_restraints     0
_refine_ls_restrained_S_all      1.072
_refine_ls_R_factor_all          0.0482
_refine_ls_R_factor_gt           0.0345
_refine_ls_shift/su_max          0.002
_refine_ls_shift/su_mean         0.000
_refine_ls_structure_factor_coef Fsqd
_refine_ls_weighting_details
'w=1/[?^2^(Fo^2^)+(0.0385P)^2^+2.8587P] where P=(Fo^2^+2Fc^2^)/3'
_refine_ls_weighting_scheme      calc
_refine_ls_wR_factor_gt          0.0848
_refine_ls_wR_factor_ref         0.0928
_reflns_Friedel_coverage         0.000
_reflns_number_gt                13824
_reflns_number_total             16005
_reflns_threshold_expression     'I > 2?(I)'
_cod_data_source_file            ja9b00129_si_003.cif
_cod_data_source_block           compound09
_cod_database_code               4128199
_shelx_shelxl_version_number     2014/7
_shelx_estimated_absorpt_t_min   0.912
_shelx_estimated_absorpt_t_max   0.937
_shelx_res_checksum              8914
_shelx_hkl_checksum              27275