Stable Planar Six-π-Electron Six-Membered N-Heterocyclic Carbenes with Tunable Electronic Properties
Carsten Präsang; Bruno Donnadieu; Guy Bertrand; Journal of the American Chemical Society 127 (2005) 10182–10183; doi:10.1021/ja052987g

data_4111827
_publ_contact_author             'Prof G. Bertrand'
_publ_contact_author_address
;
University of California
UCR-CNRS Joint Research Lab
(UMR 2282) 
Department of Chemistry
Riverside, CA 92521 USA 
;
_publ_contact_author_email       ' guy.bertrand@ucr.edu '
_publ_contact_author_fax         951-827-4713
_publ_section_title
;
 Stable Planar Six-\p-Electron Six-Membered N-Heterocyclic Carbenes with
 Tunable Electronic Properties
;
_journal_name_full               'Journal of the American Chemical Society'
_journal_page_first              10182
_journal_page_last               10183
_journal_paper_doi               10.1021/ja052987g
_journal_volume                  127
_journal_year                    2005
_chemical_formula_sum            'C34 H43 B2 N3'
_chemical_formula_weight         515.33
_space_group_IT_number           61
_symmetry_cell_setting           orthorhombic
_symmetry_space_group_name_Hall  '-P 2ac 2ab'
_symmetry_space_group_name_H-M   'P b c a'
_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            8
_cell_length_a                   13.9500(13)
_cell_length_b                   19.1510(18)
_cell_length_c                   22.413(2)
_cell_measurement_temperature    100(2)
_cell_measurement_theta_max      29.254
_cell_measurement_theta_min      2.556
_cell_volume                     5987.8(10)
_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  'SHELXL-97 (Sheldrick, 1997)'
_computing_structure_solution    'Bruker SHELXTL'
_diffrn_ambient_temperature      100(2)
_diffrn_measured_fraction_theta_full 1.000
_diffrn_measured_fraction_theta_max 1.000
_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  0.0676
_diffrn_reflns_av_sigmaI/netI    0.0435
_diffrn_reflns_limit_h_max       18
_diffrn_reflns_limit_h_min       -18
_diffrn_reflns_limit_k_max       25
_diffrn_reflns_limit_k_min       -23
_diffrn_reflns_limit_l_max       29
_diffrn_reflns_limit_l_min       -29
_diffrn_reflns_number            55886
_diffrn_reflns_theta_full        28.28
_diffrn_reflns_theta_max         28.28
_diffrn_reflns_theta_min         2.02
_exptl_absorpt_coefficient_mu    0.065
_exptl_absorpt_correction_T_max  0.9954
_exptl_absorpt_correction_T_min  0.9813
_exptl_absorpt_correction_type   multi-scan
_exptl_crystal_colour            colorless
_exptl_crystal_density_diffrn    1.143
_exptl_crystal_description       'prism frag'
_exptl_crystal_F_000             2224
_exptl_crystal_size_max          0.29
_exptl_crystal_size_mid          0.21
_exptl_crystal_size_min          0.07
_refine_diff_density_max         0.348
_refine_diff_density_min         -0.203
_refine_diff_density_rms         0.047
_refine_ls_extinction_method     none
_refine_ls_goodness_of_fit_ref   1.021
_refine_ls_hydrogen_treatment    constr
_refine_ls_matrix_type           full
_refine_ls_number_parameters     355
_refine_ls_number_reflns         7433
_refine_ls_number_restraints     0
_refine_ls_restrained_S_all      1.021
_refine_ls_R_factor_all          0.0814
_refine_ls_R_factor_gt           0.0482
_refine_ls_shift/su_max          0.003
_refine_ls_shift/su_mean         0.001
_refine_ls_structure_factor_coef Fsqd
_refine_ls_weighting_details
'calc w=1/[\s^2^(Fo^2^)+(0.0621P)^2^+1.6299P] where P=(Fo^2^+2Fc^2^)/3'
_refine_ls_weighting_scheme      calc
_refine_ls_wR_factor_gt          0.1149
_refine_ls_wR_factor_ref         0.1324
_reflns_number_gt                5050
_reflns_number_total             7433
_reflns_threshold_expression     >2sigma(I)
_cod_data_source_file            ja052987gsi20050513_053944_3.cif
_cod_data_source_block           5c
_cod_original_sg_symbol_H-M      Pbca
_cod_database_code               4111827