Nitron: a stable N-heterocyclic carbene that has been commercially available for more than a century
Christian Farber; Michael Leibold; Clemens Bruhn; Martin Maurer; Ulrich Siemeling; Chem.Commun. 48 (2012) 227–229; doi:10.1039/c1cc16460k

data_7107147
_publ_section_title
;
 Nitron: a stable N-heterocyclic carbene that has been commercially
 available for more than a century
;
_journal_issue                   2
_journal_name_full               Chem.Commun.
_journal_page_first              227
_journal_page_last               229
_journal_paper_doi               10.1039/c1cc16460k
_journal_volume                  48
_journal_year                    2012
_chemical_formula_moiety         'C28 H28 Cl N4 Rh, C H Cl3'
_chemical_formula_sum            'C29 H29 Cl4 N4 Rh'
_chemical_formula_weight         678.27
_chemical_name_systematic
;
?
;
_space_group_IT_number           14
_symmetry_cell_setting           monoclinic
_symmetry_Int_Tables_number      14
_symmetry_space_group_name_Hall  '-P 2yn'
_symmetry_space_group_name_H-M   'P 1 21/n 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                 101.116(6)
_cell_angle_gamma                90.00
_cell_formula_units_Z            4
_cell_length_a                   11.2724(9)
_cell_length_b                   16.7158(10)
_cell_length_c                   15.8324(12)
_cell_measurement_reflns_used    17648
_cell_measurement_temperature    100(2)
_cell_measurement_theta_max      25.61
_cell_measurement_theta_min      1.79
_cell_volume                     2927.3(4)
_computing_structure_refinement  'SHELXL-97 (Sheldrick, 1997)'
_computing_structure_solution    'SHELXS-97 (Sheldrick, 1990)'
_diffrn_ambient_temperature      100(2)
_diffrn_detector                 'image plate (34 cm diameter)'
_diffrn_detector_area_resol_mean 6.67
_diffrn_detector_type            STOE
_diffrn_measured_fraction_theta_full 0.998
_diffrn_measured_fraction_theta_max 0.998
_diffrn_measurement_details      ' 125 frames, detector distance = 135 mm'
_diffrn_measurement_device       '2-circle goniometer'
_diffrn_measurement_device_type  'STOE IPDS 2'
_diffrn_measurement_method       'rotation method'
_diffrn_radiation_collimation    '0.5 mm diameter, multiple pinhole'
_diffrn_radiation_monochromator  'plane graphite'
_diffrn_radiation_polarisn_norm  0
_diffrn_radiation_type           'Mo K\a'
_diffrn_radiation_wavelength     0.71073
_diffrn_reflns_av_R_equivalents  0.0677
_diffrn_reflns_av_sigmaI/netI    0.0564
_diffrn_reflns_limit_h_max       13
_diffrn_reflns_limit_h_min       -12
_diffrn_reflns_limit_k_max       19
_diffrn_reflns_limit_k_min       -19
_diffrn_reflns_limit_l_max       18
_diffrn_reflns_limit_l_min       -18
_diffrn_reflns_number            15306
_diffrn_reflns_theta_full        25.00
_diffrn_reflns_theta_max         25.00
_diffrn_reflns_theta_min         1.79
_diffrn_source
'sealed X-ray tube, 12 x 0.4 mm long-fine focus'
_diffrn_source_current           30
_diffrn_source_power             1.50
_diffrn_source_voltage           50
_diffrn_standards_decay_%        none
_exptl_absorpt_coefficient_mu    0.975
_exptl_absorpt_correction_T_max  0.9351
_exptl_absorpt_correction_T_min  0.7711
_exptl_absorpt_correction_type   integration
_exptl_absorpt_process_details   'X-red ver. 1.31 (Stoe & Cie. 2005)'
_exptl_crystal_colour            yellow
_exptl_crystal_density_diffrn    1.539
_exptl_crystal_density_method    'not measured'
_exptl_crystal_description       plate
_exptl_crystal_F_000             1376
_exptl_crystal_size_max          0.30
_exptl_crystal_size_mid          0.26
_exptl_crystal_size_min          0.06
_refine_diff_density_max         0.744
_refine_diff_density_min         -1.356
_refine_diff_density_rms         0.092
_refine_ls_extinction_method     none
_refine_ls_goodness_of_fit_ref   0.945
_refine_ls_hydrogen_treatment    mixed
_refine_ls_matrix_type           full
_refine_ls_number_parameters     358
_refine_ls_number_reflns         5137
_refine_ls_number_restraints     0
_refine_ls_restrained_S_all      0.945
_refine_ls_R_factor_all          0.0630
_refine_ls_R_factor_gt           0.0465
_refine_ls_shift/su_max          0.001
_refine_ls_shift/su_mean         0.000
_refine_ls_structure_factor_coef Fsqd
_refine_ls_weighting_details
'calc w=1/[\s^2^(Fo^2^)+(0.0813P)^2^+0.0000P] where P=(Fo^2^+2Fc^2^)/3'
_refine_ls_weighting_scheme      calc
_refine_ls_wR_factor_gt          0.1156
_refine_ls_wR_factor_ref         0.1225
_reflns_number_gt                3906
_reflns_number_total             5137
_reflns_threshold_expression     >2sigma(I)
_cod_data_source_file            c1cc16460k.txt
_cod_data_source_block           i0810
_cod_original_sg_symbol_H-M      'P 21/n'
_cod_database_code               7107147