Mononuclear Tantalum(IV, d1) Imido Complexes Supported by the Monocyclopentadienyl, Amidinate and Guanidinate Ligand Sets As Models to Explore Dinitrogen Fixation by “End-On-Bridged” Dinuclear {[Ta(IV, d1)]}2(μ-η1:η1-N2) Complexes
Yonke, Brendan L.; Keane, Andrew J.; Zavalij, Peter Y.; Sita, Lawrence R.; Organometallics 31 (2012) 345–; doi:10.1021/om200961r

data_4067957
_publ_section_title
;
 Mononuclear Tantalum(IV, d1) Imido Complexes Supported by the
 Monocyclopentadienyl, Amidinate and Guanidinate Ligand Sets As Models to
 Explore Dinitrogen Fixation by &#x201C;End-On-Bridged&#x201D; Dinuclear
 {[Ta(IV, d1)]}2(\m-\h1:\h1-N2) Complexes
;
_journal_issue                   1
_journal_name_full               Organometallics
_journal_page_first              345
_journal_paper_doi               10.1021/om200961r
_journal_volume                  31
_journal_year                    2012
_chemical_formula_moiety         'C23.16 H44.47 I0.84 N4 Ta'
_chemical_formula_sum            'C23.16 H44.47 I0.84 N4 Ta'
_chemical_formula_weight         557.58
_space_group_IT_number           14
_symmetry_cell_setting           monoclinic
_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 & ZCIF'
_cell_angle_alpha                90.00
_cell_angle_beta                 91.0540(10)
_cell_angle_gamma                90.00
_cell_formula_units_Z            4
_cell_length_a                   16.6809(14)
_cell_length_b                   9.2788(8)
_cell_length_c                   17.6464(15)
_cell_measurement_reflns_used    20115
_cell_measurement_temperature    150(2)
_cell_measurement_theta_max      31.0
_cell_measurement_theta_min      2.3
_cell_volume                     2730.8(4)
_computing_cell_refinement       Apex2
_computing_data_collection       'Apex2 (Bruker, 2005)'
_computing_data_reduction        Apex2
_computing_molecular_graphics    'XSHEL (Bruker, 2004)'
_computing_publication_material  SHELXL-97
_computing_structure_refinement  'SHELXL-97 (Sheldrick, 2008)'
_computing_structure_solution    'SHELXS-97 (Sheldrick, 2008)'
_diffrn_ambient_temperature      150(2)
_diffrn_detector                 'CCD area detector'
_diffrn_detector_area_resol_mean 8.333
_diffrn_detector_type            'Bruker Smart Apex II'
_diffrn_measured_fraction_theta_full 1.000
_diffrn_measured_fraction_theta_max 1.000
_diffrn_measurement_details      610,610,610,1200
_diffrn_measurement_device_type  'three-circle diffractometer'
_diffrn_measurement_method       '\f and \w scans'
_diffrn_measurement_specimen_support 'MiTeGen loop'
_diffrn_orient_matrix_type       standard
_diffrn_orient_matrix_UB_11      -0.0019049
_diffrn_orient_matrix_UB_12      0.0912767
_diffrn_orient_matrix_UB_13      0.0300526
_diffrn_orient_matrix_UB_21      -0.0596061
_diffrn_orient_matrix_UB_22      0.0030218
_diffrn_orient_matrix_UB_23      -0.0069673
_diffrn_orient_matrix_UB_31      -0.0062154
_diffrn_orient_matrix_UB_32      -0.0572253
_diffrn_orient_matrix_UB_33      0.0475477
_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  0.0195
_diffrn_reflns_av_sigmaI/netI    0.0152
_diffrn_reflns_limit_h_max       21
_diffrn_reflns_limit_h_min       -21
_diffrn_reflns_limit_k_max       12
_diffrn_reflns_limit_k_min       -12
_diffrn_reflns_limit_l_max       22
_diffrn_reflns_limit_l_min       -22
_diffrn_reflns_number            26813
_diffrn_reflns_theta_full        27.50
_diffrn_reflns_theta_max         27.50
_diffrn_reflns_theta_min         2.31
_diffrn_source_current           30.00
_diffrn_source_voltage           50.00
_exptl_absorpt_coefficient_mu    4.993
_exptl_absorpt_correction_T_max  0.439
_exptl_absorpt_correction_T_min  0.206
_exptl_absorpt_correction_type   multi-scan
_exptl_absorpt_process_details   'SADABS (Sheldrick, 2008)'
_exptl_crystal_colour            colourless
_exptl_crystal_density_diffrn    1.622
_exptl_crystal_density_method    'not measured'
_exptl_crystal_description       prism
_exptl_crystal_F_000             1316
_exptl_crystal_id                ' '
_exptl_crystal_size_max          0.38
_exptl_crystal_size_mid          0.31
_exptl_crystal_size_min          0.165
_refine_diff_density_max         1.574
_refine_diff_density_min         -0.736
_refine_diff_density_rms         0.077
_refine_ls_extinction_method     none
_refine_ls_goodness_of_fit_ref   1.000
_refine_ls_hydrogen_treatment    constr
_refine_ls_matrix_type           full
_refine_ls_number_parameters     296
_refine_ls_number_reflns         6261
_refine_ls_number_restraints     13
_refine_ls_restrained_S_all      0.999
_refine_ls_R_factor_all          0.0217
_refine_ls_R_factor_gt           0.0203
_refine_ls_shift/su_max          0.001
_refine_ls_shift/su_mean         0.000
_refine_ls_structure_factor_coef Fsqd
_refine_ls_weighting_details
'w=1/[\s^2^(Fo^2^)+(0.012P)^2^+6.95P], P=(max(Fo^2^,0)+2Fc^2^)/3'
_refine_ls_weighting_scheme      calc
_refine_ls_wR_factor_gt          0.0446
_refine_ls_wR_factor_ref         0.0451
_reflns_number_gt                5970
_reflns_number_total             6261
_reflns_threshold_expression     >2sigma(I)
_cod_data_source_file            om200961r_si_002.cif
_cod_data_source_block           cmpd11
_cod_original_sg_symbol_H-M      P21/c
_cod_database_code               4067957