N-heterocyclic carbenes which readily add ammonia, carbon monoxide and other small molecules,
Siemeling, Ulrich; Färber, Christian; Bruhn, Clemens; Leibold, Michael; Selent, Detlef; Baumann, Wolfgang; von Hopffgarten, Moritz; Goedecke, Catharina; Frenking, Gernot; Chemical Science 1 (2010) 697–; doi:10.1039/c0sc00451k

data_1515832
_publ_section_title
;
 N-heterocyclic carbenes which readily add ammonia, carbon monoxide and
 other small molecules,
;
_journal_issue                   6
_journal_name_full               'Chemical Science'
_journal_page_first              697
_journal_paper_doi               10.1039/c0sc00451k
_journal_volume                  1
_journal_year                    2010
_chemical_formula_moiety         'C43 H60 Fe2 N4 O'
_chemical_formula_sum            'C43 H60 Fe2 N4 O'
_chemical_formula_weight         760.65
_chemical_name_systematic
;
?
;
_space_group_IT_number           14
_symmetry_cell_setting           monoclinic
_symmetry_Int_Tables_number      14
_symmetry_space_group_name_Hall  '-P 2ybc'
_symmetry_space_group_name_H-M   'P 1 21/c 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                 97.397(6)
_cell_angle_gamma                90.00
_cell_formula_units_Z            4
_cell_length_a                   16.3194(13)
_cell_length_b                   10.7454(5)
_cell_length_c                   22.9601(17)
_cell_measurement_reflns_used    14444
_cell_measurement_temperature    173(2)
_cell_measurement_theta_max      24.76
_cell_measurement_theta_min      1.78
_cell_volume                     3992.7(5)
_computing_structure_refinement  'SHELXL-97 (Sheldrick, 1997)'
_computing_structure_solution    'SHELXS-97 (Sheldrick, 1990)'
_diffrn_ambient_temperature      173(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  0.0856
_diffrn_reflns_av_sigmaI/netI    0.0723
_diffrn_reflns_limit_h_max       19
_diffrn_reflns_limit_h_min       -19
_diffrn_reflns_limit_k_max       12
_diffrn_reflns_limit_k_min       -12
_diffrn_reflns_limit_l_max       27
_diffrn_reflns_limit_l_min       -27
_diffrn_reflns_number            25199
_diffrn_reflns_theta_full        25.00
_diffrn_reflns_theta_max         25.00
_diffrn_reflns_theta_min         1.26
_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    0.764
_exptl_absorpt_correction_T_max  0.9921
_exptl_absorpt_correction_T_min  0.7638
_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    1.265
_exptl_crystal_density_method    'not measured'
_exptl_crystal_description       plate
_exptl_crystal_F_000             1624
_exptl_crystal_size_max          0.55
_exptl_crystal_size_mid          0.28
_exptl_crystal_size_min          0.01
_refine_diff_density_max         2.219
_refine_diff_density_min         -0.850
_refine_diff_density_rms         0.106
_refine_ls_extinction_coef       0.0026(9)
_refine_ls_extinction_expression Fc^*^=kFc[1+0.001xFc^2^\l^3^/sin(2\q)]^-1/4^
_refine_ls_extinction_method     SHELXL
_refine_ls_goodness_of_fit_ref   1.050
_refine_ls_hydrogen_treatment    constr
_refine_ls_matrix_type           full
_refine_ls_number_parameters     459
_refine_ls_number_reflns         7035
_refine_ls_number_restraints     0
_refine_ls_restrained_S_all      1.050
_refine_ls_R_factor_all          0.1363
_refine_ls_R_factor_gt           0.0981
_refine_ls_shift/su_max          0.000
_refine_ls_shift/su_mean         0.000
_refine_ls_structure_factor_coef Fsqd
_refine_ls_weighting_details
'calc w=1/[\s^2^(Fo^2^)+(0.2000P)^2^+0.0000P] where P=(Fo^2^+2Fc^2^)/3'
_refine_ls_weighting_scheme      calc
_refine_ls_wR_factor_gt          0.2727
_refine_ls_wR_factor_ref         0.3049
_reflns_number_gt                4350
_reflns_number_total             7035
_reflns_threshold_expression     >2sigma(I)
_cod_data_source_file            c0sc00451k.txt
_cod_data_source_block           i0605
_cod_original_sg_symbol_H-M      'P 21/c'
_cod_database_code               1515832