N-Heterocyclic Carbene Ligands as Mimics of Imidazoles/Histidine for the Stabilization of Di- and Trinitrosyl Iron Complexes
Jennifer L. Hess; Chung-Hung Hsieh; Joseph H. Reibenspies; Marcetta Y. Darensbourg; Inorganic Chemistry 50 (2011) 8541–8552; doi:10.1021/ic201138f

data_4326136
_publ_contact_author_address
;Department of Chemistry
Texas A&M University
College Station, TX 77843
;
_publ_contact_author_email       marcetta@mail.chem.tamu.edu
_publ_contact_author_name        'Marcetta Y. Darensbourg'
_publ_contact_author_phone       979-845-5417
_publ_section_title
;
 N-Heterocyclic Carbene Ligands as Mimics of Imidazoles/Histidine for the
 Stabilization of Di- and Trinitrosyl Iron Complexes
;
_journal_name_full               'Inorganic Chemistry'
_journal_page_first              8541
_journal_page_last               8552
_journal_paper_doi               10.1021/ic201138f
_journal_volume                  50
_journal_year                    2011
_chemical_formula_sum            'C18 H32 Fe N6 O2'
_chemical_formula_weight         420.35
_space_group_IT_number           60
_symmetry_cell_setting           orthorhombic
_symmetry_space_group_name_Hall  '-P 2n 2ab'
_symmetry_space_group_name_H-M   'P b c n'
_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                 90.00
_cell_angle_gamma                90.00
_cell_formula_units_Z            4
_cell_length_a                   9.306(6)
_cell_length_b                   14.002(10)
_cell_length_c                   16.898(18)
_cell_measurement_reflns_used    2426
_cell_measurement_temperature    110(2)
_cell_measurement_theta_max      20.80
_cell_measurement_theta_min      2.41
_cell_volume                     2202(3)
_computing_cell_refinement       'Bruker SMART'
_computing_data_collection       'Bruker SMART'
_computing_data_reduction        'Bruker SAINT'
_computing_molecular_graphics    'Bruker SHELXTL'
_computing_publication_material  'Bruker SHELXTL'
_computing_structure_refinement  'SHELXL-97 (Sheldrick, 1997)'
_computing_structure_solution    'SHELXS-97 (Sheldrick, 1990)'
_diffrn_ambient_temperature      110(2)
_diffrn_measured_fraction_theta_full 0.997
_diffrn_measured_fraction_theta_max 0.997
_diffrn_measurement_device_type  'CCD area detector'
_diffrn_measurement_method       'phi and omega scans'
_diffrn_radiation_monochromator  graphite
_diffrn_radiation_source         'fine-focus sealed tube'
_diffrn_radiation_type           MoK\a
_diffrn_radiation_wavelength     0.71073
_diffrn_reflns_av_R_equivalents  0.1025
_diffrn_reflns_av_sigmaI/netI    0.0962
_diffrn_reflns_limit_h_max       12
_diffrn_reflns_limit_h_min       -12
_diffrn_reflns_limit_k_max       18
_diffrn_reflns_limit_k_min       -18
_diffrn_reflns_limit_l_max       22
_diffrn_reflns_limit_l_min       -22
_diffrn_reflns_number            24185
_diffrn_reflns_theta_full        27.86
_diffrn_reflns_theta_max         27.86
_diffrn_reflns_theta_min         2.41
_exptl_absorpt_coefficient_mu    0.708
_exptl_absorpt_correction_T_max  0.9722
_exptl_absorpt_correction_T_min  0.8951
_exptl_absorpt_correction_type   multi-scan
_exptl_absorpt_process_details   sadabs
_exptl_crystal_colour            brown
_exptl_crystal_density_diffrn    1.268
_exptl_crystal_description       block
_exptl_crystal_F_000             896
_exptl_crystal_size_max          0.16
_exptl_crystal_size_mid          0.05
_exptl_crystal_size_min          0.04
_refine_diff_density_max         0.836
_refine_diff_density_min         -0.759
_refine_diff_density_rms         0.081
_refine_ls_extinction_method     none
_refine_ls_goodness_of_fit_ref   1.033
_refine_ls_hydrogen_treatment    constr
_refine_ls_matrix_type           full
_refine_ls_number_parameters     127
_refine_ls_number_reflns         2620
_refine_ls_number_restraints     0
_refine_ls_restrained_S_all      1.033
_refine_ls_R_factor_all          0.0927
_refine_ls_R_factor_gt           0.0573
_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^)+(0.0708P)^2^+0.6064P] where P=(Fo^2^+2Fc^2^)/3'
_refine_ls_weighting_scheme      calc
_refine_ls_wR_factor_gt          0.1463
_refine_ls_wR_factor_ref         0.1731
_reflns_number_gt                1651
_reflns_number_total             2620
_reflns_threshold_expression     >2sigma(I)
_cod_data_source_file            ic201138f_si_002_4.cif
_cod_data_source_block           3
_cod_database_code               4326136