Tris[(1-isopropylbenzimidazol-2-yl)dimethylsilyl]methyl metal complexes, [TismPriBenz]M: a new class of metallacarbatranes, isomerization to a tris(N-heterocyclic carbene) derivative, and evidence for an inverted ligand field
Ruccolo, Serge; Rauch, Michael; Parkin, Gerard; Chem. Sci.  (2017) –; doi:10.1039/C7SC00499K

data_1545914
_publ_section_title
;
 Tris[(1-isopropylbenzimidazol-2-yl)dimethylsilyl]methyl metal complexes,
 [TismPriBenz]M: a new class of metallacarbatranes, isomerization to a
 tris(N-heterocyclic carbene) derivative, and evidence for an inverted
 ligand field
;
_journal_name_full               'Chem. Sci.'
_journal_paper_doi               10.1039/C7SC00499K
_journal_year                    2017
_chemical_formula_sum            'C43 H57 Br N6 Ni Si3'
_chemical_formula_weight         880.83
_space_group_crystal_system      monoclinic
_space_group_IT_number           14
_space_group_name_Hall           '-P 2ybc'
_space_group_name_H-M_alt        'P 1 21/c 1'
_symmetry_space_group_name_Hall  '-P 2ybc'
_symmetry_space_group_name_H-M   'P 1 21/c 1'
_atom_sites_solution_hydrogens   geom
_audit_creation_method           SHELXL-2014/7
_audit_update_record
;
2017-01-25 deposited with the CCDC.
2017-03-29 downloaded from the CCDC.
;
_cell_angle_alpha                90
_cell_angle_beta                 105.630(4)
_cell_angle_gamma                90
_cell_formula_units_Z            4
_cell_length_a                   12.702(3)
_cell_length_b                   18.819(5)
_cell_length_c                   18.915(5)
_cell_measurement_reflns_used    8784
_cell_measurement_temperature    130(2)
_cell_measurement_theta_max      27.45
_cell_measurement_theta_min      2.24
_cell_volume                     4354.2(19)
_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-2014/7 (Sheldrick, 2014)'
_computing_structure_solution    'SHELXS-97 (Sheldrick 2008)'
_diffrn_ambient_temperature      130(2)
_diffrn_measured_fraction_theta_full 1.000
_diffrn_measured_fraction_theta_max 0.995
_diffrn_measurement_device_type  'Bruker APEX-II CCD'
_diffrn_measurement_method       '\f and \w scans'
_diffrn_radiation_type           MoK\a
_diffrn_radiation_wavelength     0.71073
_diffrn_reflns_av_R_equivalents  0.1673
_diffrn_reflns_av_unetI/netI     0.1407
_diffrn_reflns_Laue_measured_fraction_full 1.000
_diffrn_reflns_Laue_measured_fraction_max 0.995
_diffrn_reflns_limit_h_max       18
_diffrn_reflns_limit_h_min       -18
_diffrn_reflns_limit_k_max       26
_diffrn_reflns_limit_k_min       -26
_diffrn_reflns_limit_l_max       26
_diffrn_reflns_limit_l_min       -27
_diffrn_reflns_number            70162
_diffrn_reflns_point_group_measured_fraction_full 1.000
_diffrn_reflns_point_group_measured_fraction_max 0.995
_diffrn_reflns_theta_full        25.242
_diffrn_reflns_theta_max         30.560
_diffrn_reflns_theta_min         1.556
_exptl_absorpt_coefficient_mu    1.483
_exptl_absorpt_correction_T_max  0.7461
_exptl_absorpt_correction_T_min  0.6550
_exptl_absorpt_correction_type   empirical
_exptl_absorpt_process_details   sadabs
_exptl_crystal_colour            yellow
_exptl_crystal_density_diffrn    1.344
_exptl_crystal_description       plate
_exptl_crystal_F_000             1848
_exptl_crystal_size_max          0.240
_exptl_crystal_size_mid          0.180
_exptl_crystal_size_min          0.060
_refine_diff_density_max         0.711
_refine_diff_density_min         -0.972
_refine_diff_density_rms         0.116
_refine_ls_extinction_method     none
_refine_ls_goodness_of_fit_ref   0.999
_refine_ls_hydrogen_treatment    constr
_refine_ls_matrix_type           full
_refine_ls_number_parameters     499
_refine_ls_number_reflns         13279
_refine_ls_number_restraints     0
_refine_ls_restrained_S_all      0.999
_refine_ls_R_factor_all          0.1580
_refine_ls_R_factor_gt           0.0620
_refine_ls_shift/su_max          0.000
_refine_ls_shift/su_mean         0.000
_refine_ls_structure_factor_coef Fsqd
_refine_ls_weighting_details
'w=1/[\s^2^(Fo^2^)+(0.0467P)^2^] where P=(Fo^2^+2Fc^2^)/3'
_refine_ls_weighting_scheme      calc
_refine_ls_wR_factor_gt          0.1074
_refine_ls_wR_factor_ref         0.1354
_reflns_Friedel_coverage         0.000
_reflns_number_gt                6787
_reflns_number_total             13279
_reflns_threshold_expression     'I > 2\s(I)'
_cod_data_source_file            c7sc00499k2.cif
_cod_data_source_block           nibr1mr
_cod_original_cell_volume        4354.3(19)
_cod_database_code               1545914
_shelx_shelxl_version_number     2014/7
_shelx_estimated_absorpt_t_min   0.717
_shelx_estimated_absorpt_t_max   0.916
_shelx_res_checksum              24309