Employing Dianionic Macrocyclic Tetracarbenes To Synthesize Neutral Divalent Metal Complexes
Bass, Heather M.; Cramer, S. Alan; McCullough, Alexander S.; Bernstein, Karl J.; Murdock, Christopher R.; Jenkins, David M.; Organometallics 32 (2013) 2160–; doi:10.1021/om400043z

data_4080507
_publ_section_title
;
 Employing Dianionic Macrocyclic Tetracarbenes To Synthesize Neutral
 Divalent Metal Complexes
;
_journal_issue                   7
_journal_name_full               Organometallics
_journal_page_first              2160
_journal_paper_doi               10.1021/om400043z
_journal_volume                  32
_journal_year                    2013
_chemical_formula_sum            'C20 H40 B2 Br2 N8 O4'
_chemical_formula_weight         638.04
_space_group_IT_number           179
_symmetry_cell_setting           hexagonal
_symmetry_space_group_name_Hall  'P 65 2 (0 0 1)'
_symmetry_space_group_name_H-M   'P 65 2 2'
_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                120.00
_cell_formula_units_Z            6
_cell_length_a                   13.4806(4)
_cell_length_b                   13.4806(4)
_cell_length_c                   29.3772(9)
_cell_measurement_temperature    100(2)
_cell_volume                     4623.4(2)
_computing_structure_refinement  'SHELXL-97 (Sheldrick, 1997)'
_diffrn_ambient_temperature      100(2)
_diffrn_measured_fraction_theta_full 1.000
_diffrn_measured_fraction_theta_max 1.000
_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  0.0661
_diffrn_reflns_av_sigmaI/netI    0.0239
_diffrn_reflns_limit_h_max       14
_diffrn_reflns_limit_h_min       -14
_diffrn_reflns_limit_k_max       14
_diffrn_reflns_limit_k_min       -14
_diffrn_reflns_limit_l_max       32
_diffrn_reflns_limit_l_min       -32
_diffrn_reflns_number            50485
_diffrn_reflns_theta_full        23.28
_diffrn_reflns_theta_max         23.28
_diffrn_reflns_theta_min         1.74
_exptl_absorpt_coefficient_mu    2.668
_exptl_absorpt_correction_T_max  0.9486
_exptl_absorpt_correction_T_min  0.6175
_exptl_absorpt_correction_type   multi-scan
_exptl_absorpt_process_details   SADABS
_exptl_crystal_colour            colourless
_exptl_crystal_density_diffrn    1.375
_exptl_crystal_density_method    'not measured'
_exptl_crystal_description       rod
_exptl_crystal_F_000             1968
_exptl_crystal_size_max          0.20
_exptl_crystal_size_mid          0.09
_exptl_crystal_size_min          0.02
_refine_diff_density_max         1.294
_refine_diff_density_min         -0.599
_refine_diff_density_rms         0.130
_refine_ls_abs_structure_details 'Flack H D (1983), Acta Cryst. A39, 876-881'
_refine_ls_abs_structure_Flack   0.03(3)
_refine_ls_extinction_method     none
_refine_ls_goodness_of_fit_ref   1.097
_refine_ls_hydrogen_treatment    mixed
_refine_ls_matrix_type           full
_refine_ls_number_parameters     179
_refine_ls_number_reflns         2219
_refine_ls_number_restraints     26
_refine_ls_restrained_S_all      1.205
_refine_ls_R_factor_all          0.0659
_refine_ls_R_factor_gt           0.0609
_refine_ls_shift/su_max          0.002
_refine_ls_shift/su_mean         0.000
_refine_ls_structure_factor_coef Fsqd
_refine_ls_weighting_details
'calc w=1/[\s^2^(Fo^2^)+(0.0937P)^2^+24.4583P] where P=(Fo^2^+2Fc^2^)/3'
_refine_ls_weighting_scheme      calc
_refine_ls_wR_factor_gt          0.1690
_refine_ls_wR_factor_ref         0.1737
_reflns_number_gt                2062
_reflns_number_total             2219
_reflns_threshold_expression     >2sigma(I)
_cod_data_source_file            om400043z_si_002.cif
_cod_data_source_block           macrobr2
_cod_original_sg_symbol_H-M      'p 65 2 2'
_cod_database_code               4080507