A stable crystalline N-heterocyclic carbene with a 1,1'-ferrocenediyl backbone.
Siemeling, Ulrich; Färber, Christian; Bruhn, Clemens; Chemical communications (Cambridge, England) 34 (2008) 98–100; doi:10.1039/b813809e

data_7104103
_publ_section_title
;
 A stable crystalline N-heterocyclic carbene with a 1,1'-ferrocenediyl
 backbone.
;
_journal_issue                   1
_journal_name_full
'Chemical communications (Cambridge, England)'
_journal_page_first              98
_journal_page_last               100
_journal_paper_doi               10.1039/b813809e
_journal_volume                  34
_journal_year                    2008
_chemical_formula_moiety         'C31 H39 Fe N2, C H2 Cl2, B F4'
_chemical_formula_sum            'C32 H41 B Cl2 F4 Fe N2'
_chemical_formula_weight         667.23
_chemical_name_systematic
;
?
;
_space_group_IT_number           11
_symmetry_cell_setting           monoclinic
_symmetry_space_group_name_Hall  '-P 2yb'
_symmetry_space_group_name_H-M   'P 1 21/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                 90.019(13)
_cell_angle_gamma                90.00
_cell_formula_units_Z            2
_cell_length_a                   7.9008(12)
_cell_length_b                   18.7777(19)
_cell_length_c                   10.3761(17)
_cell_measurement_reflns_used    8088
_cell_measurement_temperature    223(2)
_cell_measurement_theta_max      25.48
_cell_measurement_theta_min      1.96
_cell_volume                     1539.4(4)
_computing_structure_refinement  'SHELXL-97 (Sheldrick, 1997)'
_computing_structure_solution    'SHELXS-97 (Sheldrick, 1990)'
_diffrn_ambient_temperature      223(2)
_diffrn_detector                 'image plate (34 cm diameter)'
_diffrn_detector_area_resol_mean 6.67
_diffrn_detector_type            STOE
_diffrn_measured_fraction_theta_full 1.000
_diffrn_measured_fraction_theta_max 1.000
_diffrn_measurement_details      ' 180 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  0.1268
_diffrn_reflns_av_sigmaI/netI    0.1806
_diffrn_reflns_limit_h_max       9
_diffrn_reflns_limit_h_min       -8
_diffrn_reflns_limit_k_max       22
_diffrn_reflns_limit_k_min       -20
_diffrn_reflns_limit_l_max       12
_diffrn_reflns_limit_l_min       -12
_diffrn_reflns_number            10075
_diffrn_reflns_theta_full        25.00
_diffrn_reflns_theta_max         25.00
_diffrn_reflns_theta_min         1.96
_diffrn_source
'sealed X-ray tube, 12 x 0.4 mm long-fine focus'
_diffrn_source_current           32
_diffrn_source_power             1.60
_diffrn_source_voltage           50
_diffrn_standards_decay_%        0
_exptl_absorpt_coefficient_mu    0.713
_exptl_absorpt_correction_type   none
_exptl_crystal_colour            yellow
_exptl_crystal_density_diffrn    1.439
_exptl_crystal_density_method    'not measured'
_exptl_crystal_description       block
_exptl_crystal_F_000             696
_exptl_crystal_size_max          0.28
_exptl_crystal_size_mid          0.15
_exptl_crystal_size_min          0.12
_refine_diff_density_max         0.389
_refine_diff_density_min         -0.405
_refine_diff_density_rms         0.067
_refine_ls_extinction_method     none
_refine_ls_goodness_of_fit_ref   0.803
_refine_ls_hydrogen_treatment    constr
_refine_ls_matrix_type           full
_refine_ls_number_parameters     199
_refine_ls_number_reflns         2819
_refine_ls_number_restraints     0
_refine_ls_restrained_S_all      0.803
_refine_ls_R_factor_all          0.1324
_refine_ls_R_factor_gt           0.0542
_refine_ls_shift/su_max          0.008
_refine_ls_shift/su_mean         0.001
_refine_ls_structure_factor_coef Fsqd
_refine_ls_weighting_details
'calc w=1/[\s^2^(Fo^2^)+(0.0157P)^2^+0.0000P] where P=(Fo^2^+2Fc^2^)/3'
_refine_ls_weighting_scheme      calc
_refine_ls_wR_factor_gt          0.0833
_refine_ls_wR_factor_ref         0.0984
_reflns_number_gt                1381
_reflns_number_total             2819
_reflns_threshold_expression     >2sigma(I)
_cod_data_source_file            b813809e.txt
_cod_data_source_block           i0450a
_cod_original_sg_symbol_H-M      'P 21/m'
_cod_database_code               7104103