Crystal Clear Structural Evidence for Electron Delocalization in 1,2-Dihydro-1,2-azaborines
Eric R. Abbey; Lev N. Zakharov; Shih-Yuan Liu; Journal of the American Chemical Society 130 (2008) 7250–7252; doi:10.1021/ja8024966

data_4107890
_publ_section_title
;
 Crystal Clear Structural Evidence for Electron Delocalization in
 1,2-Dihydro-1,2-azaborines
;
_journal_name_full               'Journal of the American Chemical Society'
_journal_page_first              7250
_journal_page_last               7252
_journal_paper_doi               10.1021/ja8024966
_journal_volume                  130
_journal_year                    2008
_chemical_formula_sum            'C20 H25 B N2'
_chemical_formula_weight         304.23
_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           SHELXLTL
_cell_angle_alpha                90.00
_cell_angle_beta                 113.4510(10)
_cell_angle_gamma                90.00
_cell_formula_units_Z            8
_cell_length_a                   17.7457(13)
_cell_length_b                   11.4680(8)
_cell_length_c                   18.6032(14)
_cell_measurement_reflns_used    7518
_cell_measurement_temperature    173(2)
_cell_measurement_theta_max      26.99
_cell_measurement_theta_min      2.17
_cell_volume                     3473.2(4)
_computing_cell_refinement       'Bruker SMART'
_computing_data_collection       'Bruker SMART'
_computing_data_reduction        'Bruker SAINT'
_computing_molecular_graphics    'Bruker SHELXTL'
_computing_publication_material  'Bruker SHELXTL'
_computing_structure_refinement  'Bruker SHELXTL'
_computing_structure_solution    'Bruker SHELXTL'
_diffrn_ambient_temperature      173(2)
_diffrn_measured_fraction_theta_full 0.998
_diffrn_measured_fraction_theta_max 0.998
_diffrn_measurement_device_type  'CCD area detector Bruker Smart Apex'
_diffrn_measurement_method       'phi and omega 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  0.0296
_diffrn_reflns_av_sigmaI/netI    0.0274
_diffrn_reflns_limit_h_max       22
_diffrn_reflns_limit_h_min       -22
_diffrn_reflns_limit_k_max       14
_diffrn_reflns_limit_k_min       -14
_diffrn_reflns_limit_l_max       23
_diffrn_reflns_limit_l_min       -23
_diffrn_reflns_number            31574
_diffrn_reflns_theta_full        26.99
_diffrn_reflns_theta_max         26.99
_diffrn_reflns_theta_min         2.14
_exptl_absorpt_coefficient_mu    0.067
_exptl_absorpt_correction_T_max  0.9821
_exptl_absorpt_correction_T_min  0.9724
_exptl_absorpt_correction_type   multi-scan
_exptl_absorpt_process_details   SADABS
_exptl_crystal_colour            colorless
_exptl_crystal_density_diffrn    1.164
_exptl_crystal_description       block
_exptl_crystal_F_000             1312
_exptl_crystal_size_max          0.42
_exptl_crystal_size_mid          0.38
_exptl_crystal_size_min          0.27
_refine_diff_density_max         0.249
_refine_diff_density_min         -0.219
_refine_diff_density_rms         0.036
_refine_ls_extinction_method     none
_refine_ls_goodness_of_fit_ref   1.061
_refine_ls_hydrogen_treatment    refall
_refine_ls_matrix_type           full
_refine_ls_number_parameters     615
_refine_ls_number_reflns         7554
_refine_ls_number_restraints     0
_refine_ls_restrained_S_all      1.061
_refine_ls_R_factor_all          0.0559
_refine_ls_R_factor_gt           0.0452
_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^)+(0.0493P)^2^+0.7678P] where P=(Fo^2^+2Fc^2^)/3'
_refine_ls_weighting_scheme      calc
_refine_ls_wR_factor_gt          0.1058
_refine_ls_wR_factor_ref         0.1146
_reflns_number_gt                6292
_reflns_number_total             7554
_reflns_threshold_expression     >2sigma(I)
_cod_data_source_file            ja8024966-file006.cif
_cod_data_source_block           liu14
_cod_database_code               4107890