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_4107892
_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           2
_symmetry_cell_setting           triclinic
_symmetry_space_group_name_Hall  '-P 1'
_symmetry_space_group_name_H-M   'P -1'
_atom_sites_solution_hydrogens   geom
_atom_sites_solution_primary     direct
_atom_sites_solution_secondary   difmap
_audit_creation_method           SHELXLTL
_cell_angle_alpha                81.469(2)
_cell_angle_beta                 83.033(2)
_cell_angle_gamma                74.388(2)
_cell_formula_units_Z            4
_cell_length_a                   10.1761(11)
_cell_length_b                   11.5744(12)
_cell_length_c                   15.4369(16)
_cell_measurement_reflns_used    2364
_cell_measurement_temperature    173(2)
_cell_measurement_theta_max      21.79
_cell_measurement_theta_min      2.38
_cell_volume                     1725.4(3)
_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 0.997
_diffrn_measured_fraction_theta_max 0.997
_diffrn_measurement_device_type  'CCD area detector'
_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  0.0448
_diffrn_reflns_av_sigmaI/netI    0.0598
_diffrn_reflns_limit_h_max       12
_diffrn_reflns_limit_h_min       -12
_diffrn_reflns_limit_k_max       13
_diffrn_reflns_limit_k_min       -13
_diffrn_reflns_limit_l_max       18
_diffrn_reflns_limit_l_min       -18
_diffrn_reflns_number            16399
_diffrn_reflns_theta_full        25.00
_diffrn_reflns_theta_max         25.00
_diffrn_reflns_theta_min         1.34
_exptl_absorpt_coefficient_mu    0.068
_exptl_absorpt_correction_T_max  0.9939
_exptl_absorpt_correction_T_min  0.9879
_exptl_absorpt_correction_type   multi-scan
_exptl_absorpt_process_details   SADABS
_exptl_crystal_colour            colorless
_exptl_crystal_density_diffrn    1.171
_exptl_crystal_description       block
_exptl_crystal_F_000             656
_exptl_crystal_size_max          0.18
_exptl_crystal_size_mid          0.15
_exptl_crystal_size_min          0.09
_refine_diff_density_max         0.390
_refine_diff_density_min         -0.321
_refine_diff_density_rms         0.040
_refine_ls_extinction_method     none
_refine_ls_goodness_of_fit_ref   1.028
_refine_ls_hydrogen_treatment    mixed
_refine_ls_matrix_type           full
_refine_ls_number_parameters     599
_refine_ls_number_reflns         6056
_refine_ls_number_restraints     0
_refine_ls_restrained_S_all      1.028
_refine_ls_R_factor_all          0.0921
_refine_ls_R_factor_gt           0.0557
_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^)+(0.0540P)^2^+0.5552P] where P=(Fo^2^+2Fc^2^)/3'
_refine_ls_weighting_scheme      calc
_refine_ls_wR_factor_gt          0.1184
_refine_ls_wR_factor_ref         0.1349
_reflns_number_gt                4165
_reflns_number_total             6056
_reflns_threshold_expression     >2sigma(I)
_cod_data_source_file            ja8024966-file008.cif
_cod_data_source_block           liur21
_cod_database_code               4107892