N-Heterocyclic Carbene Ligands in Nonsymmetric Diiron Models of Hydrogenase Active Sites
Morvan, Didier; Capon, Jean-François; Gloaguen, Frédéric; Le Goff, Alan; Marchivie, Mathieu; Michaud, François; Schollhammer, Philippe; Talarmin, Jean; Yaouanc, Jean-Jacques; Pichon, Roger; Kervarec, Nelly; Organometallics 26 (2007) 2042–; doi:10.1021/om061173l

data_4072972
_publ_section_title
;
 N-Heterocyclic Carbene Ligands in Nonsymmetric Diiron Models of
 Hydrogenase Active Sites
;
_journal_issue                   8
_journal_name_full               Organometallics
_journal_page_first              2042
_journal_paper_doi               10.1021/om061173l
_journal_volume                  26
_journal_year                    2007
_chemical_formula_sum            'C16 H18 Fe2 N4 O4 S2'
_chemical_formula_weight         506.16
_chemical_name_systematic
;
 ?
;
_space_group_IT_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_date             2006-07-10T19:21:28-00:00
_audit_creation_method           'WinGX routine CIF_UPDATE'
_cell_angle_alpha                90
_cell_angle_beta                 91.601(5)
_cell_angle_gamma                90
_cell_formula_units_Z            4
_cell_length_a                   12.5398(7)
_cell_length_b                   10.9309(7)
_cell_length_c                   14.5834(6)
_cell_measurement_temperature    170(2)
_cell_volume                     1998.19(19)
_computing_cell_refinement
;
CrysAlis RED, Oxford Diffraction Ltd.,
Version 1.171.28cycle4 beta (release 11-11-2005 CrysAlis171 .NET)
(compiled Nov 11 2005,15:50:43)
;
_computing_data_collection
;
CrysAlis CCD, Oxford Diffraction Ltd.,
Version 1.171.28cycle4 beta (release 11-11-2005 CrysAlis171 .NET)
(compiled Nov 11 2005,15:50:43)
;
_computing_data_reduction
;
CrysAlis RED, Oxford Diffraction Ltd.,
Version 1.171.28cycle4 beta (release 11-11-2005 CrysAlis171 .NET)
(compiled Nov 11 2005,15:50:43)
;
_computing_molecular_graphics    'ORTEP3 for Windows (Farrugia, 1997)'
_computing_structure_refinement  'SHELXL-97 (Sheldrick, 1997)'
_computing_structure_solution    'SHELXS-97 (Sheldrick, 1997)'
_diffrn_ambient_temperature      170(2)
_diffrn_measured_fraction_theta_full 0.998
_diffrn_measured_fraction_theta_max 0.998
_diffrn_measurement_device_type  'X-CALIBUR-2 CCD 4-circle diffractometer'
_diffrn_measurement_method
;
omega-scans with kappa -79 deg (chi -58.3 deg), phi 0, 90, 180, 270 deg
;
_diffrn_radiation_monochromator  graphite
_diffrn_radiation_type           MoK\a
_diffrn_radiation_wavelength     0.71073
_diffrn_reflns_av_R_equivalents  0.0469
_diffrn_reflns_av_unetI/netI     0.0446
_diffrn_reflns_limit_h_max       15
_diffrn_reflns_limit_h_min       -15
_diffrn_reflns_limit_k_max       9
_diffrn_reflns_limit_k_min       -13
_diffrn_reflns_limit_l_max       18
_diffrn_reflns_limit_l_min       -18
_diffrn_reflns_number            15813
_diffrn_reflns_theta_full        26.37
_diffrn_reflns_theta_max         26.37
_diffrn_reflns_theta_min         3.7
_diffrn_standards_interval_count 50
_exptl_absorpt_coefficient_mu    1.691
_exptl_absorpt_correction_T_max  0.920
_exptl_absorpt_correction_T_min  0.762
_exptl_absorpt_correction_type   analytical
_exptl_absorpt_process_details
;
CrysAlis RED, Oxford Diffraction Ltd.,
Version 1.171.28cycle4 beta (release 11-11-2005 CrysAlis171 .NET)
(compiled Nov 11 2005,15:50:43)
Analytical numeric absorption correction using a multifaceted crystal
model based on expressions derived by R.C. Clark & J.S. Reid.
;
_exptl_crystal_colour            red
_exptl_crystal_density_diffrn    1.683
_exptl_crystal_density_method    'not measured'
_exptl_crystal_description
;
bevelled rectangular plate // (1 0 0), vol. 1.50 10^-3 mm^3
;
_exptl_crystal_F_000             1032
_exptl_crystal_size_max          0.24
_exptl_crystal_size_mid          0.13
_exptl_crystal_size_min          0.05
_refine_diff_density_max         0.451
_refine_diff_density_min         -0.274
_refine_diff_density_rms         0.076
_refine_ls_extinction_method     none
_refine_ls_goodness_of_fit_ref   1.018
_refine_ls_hydrogen_treatment    constr
_refine_ls_matrix_type           full
_refine_ls_number_parameters     255
_refine_ls_number_reflns         4082
_refine_ls_number_restraints     0
_refine_ls_restrained_S_all      1.018
_refine_ls_R_factor_all          0.0594
_refine_ls_R_factor_gt           0.0393
_refine_ls_shift/su_max          0.001
_refine_ls_shift/su_mean         0
_refine_ls_structure_factor_coef Fsqd
_refine_ls_weighting_details
'calc w=1/[\s^2^(Fo^2^)+(0.0438P)^2^+0.0000P] where P=(Fo^2^+2Fc^2^)/3'
_refine_ls_weighting_scheme      calc
_refine_ls_wR_factor_gt          0.08
_refine_ls_wR_factor_ref         0.0875
_reflns_number_gt                3199
_reflns_number_total             4082
_reflns_threshold_expression     >2sigma(I)
_cod_data_source_file            om061173lsi20061222_014217.cif
_cod_data_source_block           lcarb2-b
_cod_database_code               4072972