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_7104106
_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         '4(C31 H38 Fe N2), C7 H8'
_chemical_formula_sum            'C32.75 H40 Fe N2'
_chemical_formula_weight         517.52
_chemical_name_systematic
;
?
;
_space_group_IT_number           2
_symmetry_cell_setting           triclinic
_symmetry_Int_Tables_number      2
_symmetry_space_group_name_Hall  '-P 1'
_symmetry_space_group_name_H-M   'P -1'
_atom_sites_solution_hydrogens   geom
_atom_sites_solution_primary     direct
_atom_sites_solution_secondary   difmap
_audit_creation_method           SHELXL-97
_cell_angle_alpha                71.83(2)
_cell_angle_beta                 70.42(2)
_cell_angle_gamma                81.36(2)
_cell_formula_units_Z            4
_cell_length_a                   10.763(3)
_cell_length_b                   16.153(5)
_cell_length_c                   16.339(5)
_cell_measurement_reflns_used    2488
_cell_measurement_temperature    213(2)
_cell_measurement_theta_max      23.79
_cell_measurement_theta_min      1.38
_cell_volume                     2539.7(12)
_computing_structure_refinement  'SHELXL-97 (Sheldrick, 1997)'
_computing_structure_solution    'SHELXS-97 (Sheldrick, 1990)'
_diffrn_ambient_temperature      213(2)
_diffrn_detector                 'image plate (34 cm diameter)'
_diffrn_detector_area_resol_mean 6.67
_diffrn_detector_type            STOE
_diffrn_measured_fraction_theta_full 0.943
_diffrn_measured_fraction_theta_max 0.943
_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  0.1921
_diffrn_reflns_av_sigmaI/netI    0.4045
_diffrn_reflns_limit_h_max       11
_diffrn_reflns_limit_h_min       -11
_diffrn_reflns_limit_k_max       17
_diffrn_reflns_limit_k_min       -17
_diffrn_reflns_limit_l_max       17
_diffrn_reflns_limit_l_min       -17
_diffrn_reflns_number            11413
_diffrn_reflns_theta_full        22.50
_diffrn_reflns_theta_max         22.50
_diffrn_reflns_theta_min         1.33
_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_%        0
_exptl_absorpt_coefficient_mu    0.619
_exptl_absorpt_correction_T_max  0.9871
_exptl_absorpt_correction_T_min  0.9056
_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    1.353
_exptl_crystal_density_method    'not measured'
_exptl_crystal_description       plate
_exptl_crystal_F_000             1106
_exptl_crystal_size_max          0.14
_exptl_crystal_size_mid          0.13
_exptl_crystal_size_min          0.02
_refine_diff_density_max         0.575
_refine_diff_density_min         -0.340
_refine_diff_density_rms         0.087
_refine_ls_extinction_method     none
_refine_ls_goodness_of_fit_ref   0.737
_refine_ls_hydrogen_treatment    constr
_refine_ls_matrix_type           full
_refine_ls_number_parameters     569
_refine_ls_number_reflns         6269
_refine_ls_number_restraints     0
_refine_ls_restrained_S_all      0.737
_refine_ls_R_factor_all          0.2322
_refine_ls_R_factor_gt           0.0820
_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^)+(0.0248P)^2^+0.0000P] where P=(Fo^2^+2Fc^2^)/3'
_refine_ls_weighting_scheme      calc
_refine_ls_wR_factor_gt          0.1453
_refine_ls_wR_factor_ref         0.2023
_reflns_number_gt                1750
_reflns_number_total             6269
_reflns_threshold_expression     >2sigma(I)
_cod_data_source_file            b813809e.txt
_cod_data_source_block           i0495
_cod_database_code               7104106