Imidazolium-benzimidazolates as convenient sources of donor-functionalised normal and abnormal N-heterocyclic carbenes.
Kureja, Kunal; Zinke, Julian; Bruhn, Clemens; Siemeling, Ulrich; Chemical communications (Cambridge, England) 55 (2019) 9705–9708; doi:10.1039/c9cc05283f

data_7125756
_publ_section_title
;
 Imidazolium-benzimidazolates as convenient sources of
 donor-functionalised normal and abnormal N-heterocyclic carbenes.
;
_journal_issue                   65
_journal_name_full
'Chemical communications (Cambridge, England)'
_journal_page_first              9705
_journal_page_last               9708
_journal_paper_doi               10.1039/c9cc05283f
_journal_volume                  55
_journal_year                    2019
_chemical_formula_sum            'C18 H18 N4 Ni'
_chemical_formula_weight         349.07
_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'
_atom_sites_solution_hydrogens   geom
_audit_creation_method           SHELXL-2017/1
_audit_update_record
;
2019-07-08 deposited with the CCDC.	2019-07-19 downloaded from the CCDC.
;
_cell_angle_alpha                90
_cell_angle_beta                 100.060(2)
_cell_angle_gamma                90
_cell_formula_units_Z            8
_cell_length_a                   15.4397(4)
_cell_length_b                   13.0180(2)
_cell_length_c                   15.7193(4)
_cell_measurement_reflns_used    15056
_cell_measurement_temperature    100(2)
_cell_measurement_theta_max      70.68
_cell_measurement_theta_min      4.44
_cell_volume                     3110.91(12)
_computing_structure_refinement  'SHELXL-2017/1 (Sheldrick, 2017)'
_diffrn_ambient_temperature      100(2)
_diffrn_detector                 Pilatus200K
_diffrn_detector_area_resol_mean 5.81
_diffrn_detector_type            'DECTRIS PILATUS 200K'
_diffrn_measured_fraction_theta_full 0.987
_diffrn_measured_fraction_theta_max 0.986
_diffrn_measurement_details      ' 1325 frames, detector distance = 60 mm'
_diffrn_measurement_device       'Eulerian 4-circle diffractometer'
_diffrn_measurement_device_type  'STOE STADIVARI'
_diffrn_measurement_method       'rotation method, \w scans'
_diffrn_radiation_collimation    '1.2 mm, 0.6 diameter'
_diffrn_radiation_monochromator  'Graded multilayer mirror'
_diffrn_radiation_polarisn_norm  0
_diffrn_radiation_probe          x-ray
_diffrn_radiation_type           'Cu K\a'
_diffrn_radiation_wavelength     1.54186
_diffrn_reflns_av_R_equivalents  0.0177
_diffrn_reflns_av_unetI/netI     0.0188
_diffrn_reflns_Laue_measured_fraction_full 0.987
_diffrn_reflns_Laue_measured_fraction_max 0.986
_diffrn_reflns_limit_h_max       18
_diffrn_reflns_limit_h_min       -16
_diffrn_reflns_limit_k_max       13
_diffrn_reflns_limit_k_min       -15
_diffrn_reflns_limit_l_max       12
_diffrn_reflns_limit_l_min       -18
_diffrn_reflns_number            14051
_diffrn_reflns_point_group_measured_fraction_full 0.987
_diffrn_reflns_point_group_measured_fraction_max 0.986
_diffrn_reflns_theta_full        67.686
_diffrn_reflns_theta_max         68.497
_diffrn_reflns_theta_min         4.438
_diffrn_source                   Cu-Genix
_diffrn_source_current           0.600
_diffrn_source_power             0.030
_diffrn_source_voltage           50
_exptl_absorpt_coefficient_mu    1.821
_exptl_absorpt_correction_T_max  0.9760
_exptl_absorpt_correction_T_min  0.9412
_exptl_absorpt_correction_type   integration
_exptl_absorpt_process_details
;
STOE X-Red32, absorption correction by Gaussian integration, analogous to
P. Coppens, "The Evaluation of Absorption and Extinction in Single-Crystal
Structure Analysis", published in
F. R. Ahmed (Editor), "Crystallographic Computing",
Munksgaard, Copenhagen (1970), 255 - 270
;
_exptl_crystal_colour            yellow
_exptl_crystal_density_diffrn    1.491
_exptl_crystal_description       plate
_exptl_crystal_F_000             1456
_exptl_crystal_size_max          0.100
_exptl_crystal_size_mid          0.050
_exptl_crystal_size_min          0.040
_refine_diff_density_max         0.268
_refine_diff_density_min         -0.257
_refine_diff_density_rms         0.047
_refine_ls_extinction_method     none
_refine_ls_goodness_of_fit_ref   1.049
_refine_ls_hydrogen_treatment    constr
_refine_ls_matrix_type           full
_refine_ls_number_parameters     419
_refine_ls_number_reflns         5650
_refine_ls_number_restraints     0
_refine_ls_restrained_S_all      1.049
_refine_ls_R_factor_all          0.0379
_refine_ls_R_factor_gt           0.0281
_refine_ls_shift/su_max          0.002
_refine_ls_shift/su_mean         0.000
_refine_ls_structure_factor_coef Fsqd
_refine_ls_weighting_details
'w=1/[\s^2^(Fo^2^)+(0.0231P)^2^+2.7244P] where P=(Fo^2^+2Fc^2^)/3'
_refine_ls_weighting_scheme      calc
_refine_ls_wR_factor_gt          0.0604
_refine_ls_wR_factor_ref         0.0653
_reflns_Friedel_coverage         0.000
_reflns_number_gt                4817
_reflns_number_total             5650
_reflns_threshold_expression     'I > 2\s(I)'
_cod_data_source_file            c9cc05283f2.cif
_cod_data_source_block           sv0494
_cod_original_sg_symbol_H-M      'P 21/c'
_cod_database_code               7125756
_shelx_shelxl_version_number     2017/1
_shelx_estimated_absorpt_t_min   0.839
_shelx_estimated_absorpt_t_max   0.931
_shelx_res_checksum              33554