New bis(benzimidazole) cations for threading through dibenzo-24-crown-8.
Li, Liwei; Clarkson, Guy J.; Organic letters 9 (2007) 497–500; doi:10.1021/ol062912x

data_1505289
_publ_section_title
;
 New bis(benzimidazole) cations for threading through dibenzo-24-crown-8.
;
_journal_issue                   3
_journal_name_full               'Organic letters'
_journal_page_first              497
_journal_page_last               500
_journal_paper_doi               10.1021/ol062912x
_journal_volume                  9
_journal_year                    2007
_chemical_formula_sum            'C44 H54 B2 F8 N6 O8'
_chemical_formula_weight         968.55
_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                 100.314(15)
_cell_angle_gamma                90.00
_cell_formula_units_Z            2
_cell_length_a                   11.526(10)
_cell_length_b                   14.191(13)
_cell_length_c                   14.332(13)
_cell_measurement_reflns_used    8192
_cell_measurement_temperature    180(2)
_cell_measurement_theta_max      28.240
_cell_measurement_theta_min      2.301
_cell_volume                     2306(4)
_computing_cell_refinement       'SAINT (Siemens, 1995)'
_computing_data_collection       'SMART (Siemens, 1994)'
_computing_data_reduction        'SAINT (Siemens, 1995)'
_computing_molecular_graphics    'SHELXTL (Sheldrick, 1997)'
_computing_publication_material  'SHELXTL (Sheldrick, 1997)'
_computing_structure_refinement  'SHELXL-97 (Sheldrick, 1997)'
_computing_structure_solution    'SHELXS-97 (Sheldrick, 1990)'
_diffrn_ambient_temperature      180(2)
_diffrn_detector_area_resol_mean 8.192
_diffrn_measured_fraction_theta_full 0.998
_diffrn_measured_fraction_theta_max 0.943
_diffrn_measurement_device_type  'Siemens SMART diffractometer'
_diffrn_measurement_method       '\w scans'
_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  0.0625
_diffrn_reflns_av_sigmaI/netI    0.0507
_diffrn_reflns_limit_h_max       15
_diffrn_reflns_limit_h_min       -15
_diffrn_reflns_limit_k_max       19
_diffrn_reflns_limit_k_min       -19
_diffrn_reflns_limit_l_max       18
_diffrn_reflns_limit_l_min       -18
_diffrn_reflns_number            26148
_diffrn_reflns_theta_full        27.50
_diffrn_reflns_theta_max         29.09
_diffrn_reflns_theta_min         1.80
_diffrn_standards_decay_%        nil
_exptl_absorpt_coefficient_mu    0.116
_exptl_absorpt_correction_T_max  0.9885
_exptl_absorpt_correction_T_min  0.9152
_exptl_absorpt_correction_type   multi-scan
_exptl_absorpt_process_details   'SADABS (Sheldrick, 1996)'
_exptl_crystal_colour            colourless
_exptl_crystal_density_diffrn    1.395
_exptl_crystal_density_method    'not measured'
_exptl_crystal_description       block
_exptl_crystal_F_000             1012
_exptl_crystal_size_max          0.40
_exptl_crystal_size_mid          0.40
_exptl_crystal_size_min          0.10
_refine_diff_density_max         0.361
_refine_diff_density_min         -0.315
_refine_diff_density_rms         0.056
_refine_ls_extinction_method     none
_refine_ls_goodness_of_fit_ref   1.038
_refine_ls_hydrogen_treatment    mixed
_refine_ls_matrix_type           full
_refine_ls_number_parameters     351
_refine_ls_number_reflns         5828
_refine_ls_number_restraints     0
_refine_ls_restrained_S_all      1.038
_refine_ls_R_factor_all          0.0818
_refine_ls_R_factor_gt           0.0614
_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^)+(0.0763P)^2^+0.8707P] where P=(Fo^2^+2Fc^2^)/3'
_refine_ls_weighting_scheme      calc
_refine_ls_wR_factor_gt          0.1500
_refine_ls_wR_factor_ref         0.1615
_reflns_number_gt                4516
_reflns_number_total             5828
_reflns_threshold_expression     >2sigma(I)
_cod_data_source_file            ol062912xsi20061229_041259.cif
_cod_data_source_block           ll55
_cod_original_sg_symbol_H-M      P2(1)/c
_cod_database_code               1505289