An inorganic propellane with central B‒B bond
Pospiech, Steffen; Brough, Sarah; Bolte, Michael; Lerner, Hans-Wolfram; Bettinger, Holger F.; Wagner, Matthias; Chemical Communications (Cambridge, United Kingdom) 48 (2012) 5886–5888; doi:10.1039/c2cc32256k

data_7107809
_publ_section_title
;
 An inorganic propellane with central B--B bond
;
_journal_coden_ASTM              CHCOFS
_journal_issue                   47
_journal_name_full
;
 Chemical Communications (Cambridge, United Kingdom)
;
_journal_page_first              5886
_journal_page_last               5888
_journal_paper_doi               10.1039/c2cc32256k
_journal_volume                  48
_journal_year                    2012
_chemical_formula_moiety         'C18 H24 B2 Cl2 N2'
_chemical_formula_sum            'C18 H24 B2 Cl2 N2'
_chemical_formula_weight         360.91
_space_group_IT_number           33
_symmetry_cell_setting           orthorhombic
_symmetry_space_group_name_Hall  'P 2c -2n'
_symmetry_space_group_name_H-M   'P n a 21'
_atom_sites_solution_hydrogens   geom
_atom_sites_solution_primary     direct
_atom_sites_solution_secondary   difmap
_audit_creation_method           SHELXL-97
_cell_angle_alpha                90.00
_cell_angle_beta                 90.00
_cell_angle_gamma                90.00
_cell_formula_units_Z            4
_cell_length_a                   15.8266(9)
_cell_length_b                   12.0793(8)
_cell_length_c                   9.9030(6)
_cell_measurement_reflns_used    7272
_cell_measurement_temperature    173(2)
_cell_measurement_theta_max      26.0
_cell_measurement_theta_min      3.4
_cell_volume                     1893.2(2)
_computing_cell_refinement       'X-Area (Stoe & Cie, 2001)'
_computing_data_collection       'X-Area (Stoe & Cie, 2001)'
_computing_data_reduction        'X-Area (Stoe & Cie, 2001)'
_computing_molecular_graphics    'XP (Sheldrick, 2008)'
_computing_publication_material  SHELXL97
_computing_structure_refinement  'SHELXL97 (Sheldrick, 2008) '
_computing_structure_solution    'SHELXS97 (Sheldrick, 2008) '
_diffrn_ambient_temperature      173(2)
_diffrn_measured_fraction_theta_full 0.996
_diffrn_measured_fraction_theta_max 0.995
_diffrn_measurement_device_type  'STOE IPDS II two-circle-diffractometer'
_diffrn_measurement_method       \w
_diffrn_radiation_monochromator  graphite
_diffrn_radiation_source         'fine-focus sealed tube'
_diffrn_radiation_type           MoK\a
_diffrn_radiation_wavelength     0.71073
_diffrn_reflns_av_R_equivalents  0.0368
_diffrn_reflns_av_sigmaI/netI    0.0404
_diffrn_reflns_limit_h_max       19
_diffrn_reflns_limit_h_min       -16
_diffrn_reflns_limit_k_max       14
_diffrn_reflns_limit_k_min       -14
_diffrn_reflns_limit_l_max       11
_diffrn_reflns_limit_l_min       -12
_diffrn_reflns_number            7304
_diffrn_reflns_theta_full        25.00
_diffrn_reflns_theta_max         25.56
_diffrn_reflns_theta_min         3.37
_diffrn_standards_number         0
_exptl_absorpt_coefficient_mu    0.344
_exptl_absorpt_correction_T_max  0.9127
_exptl_absorpt_correction_T_min  0.8978
_exptl_absorpt_correction_type   multi-scan
_exptl_absorpt_process_details   'MULABS (Spek, 2003; Blessing, 1995)'
_exptl_crystal_colour            colourless
_exptl_crystal_density_diffrn    1.266
_exptl_crystal_density_method    'not measured'
_exptl_crystal_description       block
_exptl_crystal_F_000             760
_exptl_crystal_size_max          0.32
_exptl_crystal_size_mid          0.32
_exptl_crystal_size_min          0.27
_refine_diff_density_max         0.215
_refine_diff_density_min         -0.145
_refine_diff_density_rms         0.032
_refine_ls_abs_structure_details 'Flack H D (1983), Acta Cryst. A39, 876-881'
_refine_ls_abs_structure_Flack   0.05(4)
_refine_ls_extinction_coef       0.0104(10)
_refine_ls_extinction_expression Fc^*^=kFc[1+0.001xFc^2^\l^3^/sin(2\q)]^-1/4^
_refine_ls_extinction_method     SHELXL
_refine_ls_goodness_of_fit_ref   0.967
_refine_ls_hydrogen_treatment    mixed
_refine_ls_matrix_type           full
_refine_ls_number_parameters     230
_refine_ls_number_reflns         3272
_refine_ls_number_restraints     1
_refine_ls_restrained_S_all      0.967
_refine_ls_R_factor_all          0.0305
_refine_ls_R_factor_gt           0.0262
_refine_ls_shift/su_max          0.000
_refine_ls_shift/su_mean         0.000
_refine_ls_structure_factor_coef Fsqd
_refine_ls_weighting_details
'calc w=1/[\s^2^(Fo^2^)+(0.0301P)^2^+0.0000P] where P=(Fo^2^+2Fc^2^)/3'
_refine_ls_weighting_scheme      calc
_refine_ls_wR_factor_gt          0.0569
_refine_ls_wR_factor_ref         0.0578
_reflns_number_gt                2943
_reflns_number_total             3272
_reflns_threshold_expression     I>2\s(I)
_cod_data_source_file            c2cc32256k.txt
_cod_data_source_block           wa1181
_cod_original_sg_symbol_H-M      Pna21
_cod_database_code               7107809