Hypoelectronic 8-11-Vertex Irida- and Rhodaboranes.
Roy, Dipak Kumar; Borthakur, Rosmita; Prakash, Rini; Bhattacharya, Somnath; Jagan, Rajamony; Ghosh, Sundargopal; Inorganic chemistry 55 (2016) 4764–4770; doi:10.1021/acs.inorgchem.6b00076

data_4347361
_publ_section_title
;
 Hypoelectronic 8-11-Vertex Irida- and Rhodaboranes.
;
_journal_issue                   10
_journal_name_full               'Inorganic chemistry'
_journal_page_first              4764
_journal_page_last               4770
_journal_paper_doi               10.1021/acs.inorgchem.6b00076
_journal_volume                  55
_journal_year                    2016
_chemical_formula_sum            'C20 H38 B8 Ir2'
_chemical_formula_weight         749.38
_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
_audit_creation_method           SHELXL-2014/7
_cell_angle_alpha                90
_cell_angle_beta                 90
_cell_angle_gamma                90
_cell_formula_units_Z            4
_cell_length_a                   17.8713(14)
_cell_length_b                   9.5072(7)
_cell_length_c                   14.8172(11)
_cell_measurement_reflns_used    8348
_cell_measurement_temperature    296(2)
_cell_measurement_theta_max      27.19
_cell_measurement_theta_min      2.43
_cell_volume                     2517.5(3)
_computing_cell_refinement       'APEXII/SAINT (Bruker, 2012)'
_computing_data_collection       'APEXII (Bruker, 2012)'
_computing_data_reduction        'SAINT/XPREP (Bruker, 2012)'
_computing_molecular_graphics    'ORTEP3 (Farrugia, 1997) '
_computing_publication_material  'SHELXL-2014/7 (Sheldrick, 2014)'
_computing_structure_refinement  'SHELXL-2014/7 (Sheldrick, 2014)'
_computing_structure_solution    'SHELXL-2014/7 (Sheldrick, 2014)'
_diffrn_ambient_temperature      296(2)
_diffrn_measured_fraction_theta_full 1.000
_diffrn_measured_fraction_theta_max 1.000
_diffrn_measurement_device_type  'Bruker kappa apex2 CCD Diffractometer'
_diffrn_measurement_method       '\w and \f scan'
_diffrn_radiation_type           MoK\a
_diffrn_radiation_wavelength     0.71073
_diffrn_reflns_av_R_equivalents  0.0617
_diffrn_reflns_av_unetI/netI     0.0636
_diffrn_reflns_Laue_measured_fraction_full 1.000
_diffrn_reflns_Laue_measured_fraction_max 1.000
_diffrn_reflns_limit_h_max       21
_diffrn_reflns_limit_h_min       -21
_diffrn_reflns_limit_k_max       10
_diffrn_reflns_limit_k_min       -11
_diffrn_reflns_limit_l_max       16
_diffrn_reflns_limit_l_min       -17
_diffrn_reflns_number            16279
_diffrn_reflns_point_group_measured_fraction_full 0.947
_diffrn_reflns_point_group_measured_fraction_max 0.945
_diffrn_reflns_theta_full        25.242
_diffrn_reflns_theta_max         25.498
_diffrn_reflns_theta_min         2.279
_exptl_absorpt_coefficient_mu    10.567
_exptl_absorpt_correction_T_max  0.4218
_exptl_absorpt_correction_T_min  0.3521
_exptl_absorpt_correction_type   multi-scan
_exptl_absorpt_process_details   'SADABS (Bruker, 2012)'
_exptl_crystal_colour            yellow
_exptl_crystal_density_diffrn    1.977
_exptl_crystal_description       block
_exptl_crystal_F_000             1408
_exptl_crystal_size_max          0.320
_exptl_crystal_size_mid          0.260
_exptl_crystal_size_min          0.120
_refine_diff_density_max         2.806
_refine_diff_density_min         -1.659
_refine_diff_density_rms         0.175
_refine_ls_abs_structure_details
;
 Flack x determined using 1575 quotients [(I+)-(I-)]/[(I+)+(I-)]
 (Parsons, Flack and Wagner, Acta Cryst. B69 (2013) 249-259).
;
_refine_ls_abs_structure_Flack   0.050(16)
_refine_ls_extinction_method     none
_refine_ls_goodness_of_fit_ref   1.016
_refine_ls_hydrogen_treatment    constr
_refine_ls_matrix_type           full
_refine_ls_number_parameters     281
_refine_ls_number_reflns         4442
_refine_ls_number_restraints     7
_refine_ls_restrained_S_all      1.015
_refine_ls_R_factor_all          0.0462
_refine_ls_R_factor_gt           0.0380
_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^)+(0.0229P)^2^+9.1013P] where P=(Fo^2^+2Fc^2^)/3'
_refine_ls_weighting_scheme      calc
_refine_ls_wR_factor_gt          0.0758
_refine_ls_wR_factor_ref         0.0792
_reflns_Friedel_coverage         0.815
_reflns_Friedel_fraction_full    0.889
_reflns_Friedel_fraction_max     0.885
_reflns_number_gt                3971
_reflns_number_total             4442
_reflns_threshold_expression     'I > 2\s(I)'
_cod_data_source_file            ic6b00076_si_002.cif
_cod_data_source_block           5
_cod_database_code               4347361
_shelx_shelxl_version_number     2014/7
_shelx_estimated_absorpt_t_min   0.133
_shelx_estimated_absorpt_t_max   0.364
_shelx_res_checksum              90724
_shelx_hkl_checksum              29084