Structural Chemistry of arachno-Nonaboranes
Jonathan Bould; Robert Greatrex; John D. Kennedy; Daniel L. Ormsby; Michael G. S. Londesborough; Karen L. F. Callaghan; Mark Thornton-Pett; Trevor R. Spalding; Simon J. Teat; William Clegg; Hong Fang; Nigam P. Rath; Lawrence Barton; Journal of the American Chemical Society 124 (2002) 7429–7439; doi:10.1021/ja025700d

data_4114896
_publ_section_title
;
 Structural Chemistry of arachno-Nonaboranes
;
_journal_name_full               'Journal of the American Chemical Society'
_journal_page_first              7429
_journal_page_last               7439
_journal_paper_doi               10.1021/ja025700d
_journal_volume                  124
_journal_year                    2002
_chemical_formula_sum            'C4 H24 B9 Br2 N'
_chemical_formula_weight         343.35
_chemical_name_systematic
; 
 ? 
;
_space_group_IT_number           14
_symmetry_cell_setting           monoclinic
_symmetry_space_group_name_Hall  '-P 2ybc'
_symmetry_space_group_name_H-M   'P 1 21/c 1'
_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                 99.256(4)
_cell_angle_gamma                90.00
_cell_formula_units_Z            4
_cell_length_a                   8.8043(4)
_cell_length_b                   18.4412(7)
_cell_length_c                   10.0523(4)
_cell_measurement_temperature    73(2)
_cell_volume                     1610.86(12)
_computing_structure_refinement  'SHELXL-97 (Sheldrick, 1997)'
_computing_structure_solution    'SHELXS-97 (Sheldrick, 1990)'
_diffrn_ambient_temperature      73(2)
_diffrn_measured_fraction_theta_full 0.953
_diffrn_measured_fraction_theta_max 0.953
_diffrn_radiation_monochromator  graphite
_diffrn_radiation_source         'fine-focus sealed tube'
_diffrn_radiation_type           CuK\a
_diffrn_radiation_wavelength     1.54184
_diffrn_reflns_av_R_equivalents  0.0000
_diffrn_reflns_av_sigmaI/netI    0.0138
_diffrn_reflns_limit_h_max       10
_diffrn_reflns_limit_h_min       -10
_diffrn_reflns_limit_k_max       21
_diffrn_reflns_limit_k_min       0
_diffrn_reflns_limit_l_max       11
_diffrn_reflns_limit_l_min       0
_diffrn_reflns_number            2583
_diffrn_reflns_theta_full        64.58
_diffrn_reflns_theta_max         64.58
_diffrn_reflns_theta_min         4.80
_exptl_absorpt_coefficient_mu    6.089
_exptl_absorpt_correction_T_max  0.3908
_exptl_absorpt_correction_T_min  0.1407
_exptl_crystal_density_diffrn    1.416
_exptl_crystal_F_000             680
_exptl_crystal_size_max          0.53
_exptl_crystal_size_mid          0.36
_exptl_crystal_size_min          0.19
_refine_diff_density_max         0.885
_refine_diff_density_min         -0.761
_refine_diff_density_rms         0.079
_refine_ls_extinction_coef       0.0020(2)
_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   1.042
_refine_ls_hydrogen_treatment    mixed
_refine_ls_matrix_type           full
_refine_ls_number_parameters     239
_refine_ls_number_reflns         2583
_refine_ls_number_restraints     0
_refine_ls_restrained_S_all      1.042
_refine_ls_R_factor_all          0.0476
_refine_ls_R_factor_gt           0.0424
_refine_ls_shift/su_max          0.001
_refine_ls_shift/su_mean         0.000
_refine_ls_structure_factor_coef Fsqd
_refine_ls_weighting_details
'calc w=1/[\s^2^(Fo^2^)+(0.0642P)^2^+2.4586P] where P=(Fo^2^+2Fc^2^)/3'
_refine_ls_weighting_scheme      calc
_refine_ls_wR_factor_gt          0.1118
_refine_ls_wR_factor_ref         0.1168
_reflns_number_gt                2293
_reflns_number_total             2583
_reflns_threshold_expression     >2sigma(I)
_cod_data_source_file            ja025700d_s2_1.cif
_cod_data_source_block           jb3
_cod_database_code               4114896