Overcoming NHCs neutrality: installing tetracarbenes on group 13 and 14 metals.
Cramer, S. Alan; Sturgill, Forrest L.; Chandrachud, Preeti P.; Jenkins, David M.; Dalton transactions (Cambridge, England : 2003) 43 (2014) 7687–7690; doi:10.1039/c4dt00990h

data_7029856
_publ_section_title
;
 Overcoming NHCs neutrality: installing tetracarbenes on group 13 and 14
 metals.
;
_journal_issue                   21
_journal_name_full
'Dalton transactions (Cambridge, England : 2003)'
_journal_page_first              7687
_journal_page_last               7690
_journal_paper_doi               10.1039/c4dt00990h
_journal_volume                  43
_journal_year                    2014
_chemical_formula_moiety         'C20 H28 Al B2 Br N8'
_chemical_formula_sum            'C20 H28 Al B2 Br N8'
_chemical_formula_weight         509.01
_chemical_name_systematic
;
 ?
;
_space_group_IT_number           12
_symmetry_cell_setting           monoclinic
_symmetry_space_group_name_Hall  '-C 2y'
_symmetry_space_group_name_H-M   'C 1 2/m 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                 89.982(3)
_cell_angle_gamma                90.00
_cell_formula_units_Z            4
_cell_length_a                   9.050(2)
_cell_length_b                   13.820(3)
_cell_length_c                   17.544(4)
_cell_measurement_temperature    100(2)
_cell_volume                     2194.2(8)
_computing_cell_refinement       'Bruker SAINT'
_computing_data_collection       'Bruker APEX2'
_computing_data_reduction        'Bruker SAINT'
_computing_molecular_graphics    'Bruker SHELXTL'
_computing_publication_material  'Bruker SHELXTL'
_computing_structure_refinement  'SHELXL-97 (Sheldrick, 2008)'
_computing_structure_solution    'SHELXS-97 (Sheldrick, 2008)'
_diffrn_ambient_temperature      100(2)
_diffrn_measured_fraction_theta_full 0.999
_diffrn_measured_fraction_theta_max 0.999
_diffrn_measurement_device_type  'Bruker Apex II CCD'
_diffrn_measurement_method       '\w scan'
_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  0.0917
_diffrn_reflns_av_sigmaI/netI    0.0690
_diffrn_reflns_limit_h_max       10
_diffrn_reflns_limit_h_min       -10
_diffrn_reflns_limit_k_max       15
_diffrn_reflns_limit_k_min       -15
_diffrn_reflns_limit_l_max       19
_diffrn_reflns_limit_l_min       -19
_diffrn_reflns_number            8896
_diffrn_reflns_theta_full        23.28
_diffrn_reflns_theta_max         23.28
_diffrn_reflns_theta_min         1.16
_exptl_absorpt_coefficient_mu    1.941
_exptl_absorpt_correction_T_max  0.9622
_exptl_absorpt_correction_T_min  0.9092
_exptl_absorpt_correction_type   multi-scan
_exptl_absorpt_process_details   SADABS
_exptl_crystal_colour            colourless
_exptl_crystal_density_diffrn    1.541
_exptl_crystal_density_method    'not measured'
_exptl_crystal_description       plate
_exptl_crystal_F_000             1048
_exptl_crystal_size_max          0.05
_exptl_crystal_size_mid          0.04
_exptl_crystal_size_min          0.02
_refine_diff_density_max         2.006
_refine_diff_density_min         -1.251
_refine_diff_density_rms         0.176
_refine_ls_extinction_method     none
_refine_ls_goodness_of_fit_ref   1.084
_refine_ls_hydrogen_treatment    mixed
_refine_ls_matrix_type           full
_refine_ls_number_parameters     126
_refine_ls_number_reflns         1655
_refine_ls_number_restraints     6
_refine_ls_restrained_S_all      1.151
_refine_ls_R_factor_all          0.1116
_refine_ls_R_factor_gt           0.0756
_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^)+(0.0799P)^2^+66.9766P] where P=(Fo^2^+2Fc^2^)/3'
_refine_ls_weighting_scheme      calc
_refine_ls_wR_factor_gt          0.1866
_refine_ls_wR_factor_ref         0.2117
_reflns_number_gt                1185
_reflns_number_total             1655
_reflns_threshold_expression     >2sigma(I)
_cod_data_source_file            c4dt00990h2.cif
_cod_data_source_block           Al(III)BrBorate
_cod_depositor_comments
'Adding full bibliography for 7029853--7029856.cif.'
_cod_original_cell_volume        2194.1(9)
_cod_original_sg_symbol_H-M      'C 2/m'
_cod_database_code               7029856