Oxygen extrusion from amidate ligands to generate terminal Ta[double bond, length as m-dash]O units under reducing conditions. How to successfully use amidate ligands in dinitrogen coordination chemistry.
Horrillo-Martinez, Patricia; Patrick, Brian O.; Schafer, Laurel L.; Fryzuk, Michael D.; Dalton transactions (Cambridge, England : 2003) 41 (2012) 1609–1616; doi:10.1039/c1dt11595b

data_7017872
_publ_section_title
;
 Oxygen extrusion from amidate ligands to generate terminal Ta[double
 bond, length as m-dash]O units under reducing conditions. How to
 successfully use amidate ligands in dinitrogen coordination chemistry.
;
_journal_issue                   5
_journal_name_full
'Dalton transactions (Cambridge, England : 2003)'
_journal_page_first              1609
_journal_page_last               1616
_journal_paper_doi               10.1039/c1dt11595b
_journal_volume                  41
_journal_year                    2012
_chemical_formula_moiety         'C23 H33 Cl N O Ta, C13 H19 N O'
_chemical_formula_sum            'C36 H52 Cl N2 O2 Ta'
_chemical_formula_weight         761.20
_chemical_name_common
;
(eta5-pentamethylcyclopendienyl)(eta2-N-2,6-
dimethylphenyl(tert-butyl)iminoacyl) (oxo)tantalum
;
_chemical_name_systematic
;
(eta5-pentamethylcyclopendienyl)(eta2-N-2,6-dimethylphenyl(tert-butyl)iminoacyl)
(oxo)tantalum
;
_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
_cell_angle_alpha                90.00
_cell_angle_beta                 94.868(3)
_cell_angle_gamma                90.00
_cell_formula_units_Z            4
_cell_length_a                   8.4087(8)
_cell_length_b                   19.2914(17)
_cell_length_c                   22.039(2)
_cell_measurement_reflns_used    8026
_cell_measurement_temperature    100.0(2)
_cell_measurement_theta_max      29.96
_cell_measurement_theta_min      2.65
_cell_volume                     3562.2(6)
_computing_cell_refinement       'Bruker SAINT'
_computing_data_collection       'Bruker APEX2'
_computing_data_reduction        'Bruker SAINT'
_computing_molecular_graphics    'Bruker SHELXTL'
_computing_publication_material  'Bruker SHELXTL'
_computing_structure_refinement  'SHELXL-97 (Sheldrick, 2008)'
_computing_structure_solution    'SHELXS-97 (Sheldrick, 2008)'
_diffrn_ambient_temperature      100.0(2)
_diffrn_measured_fraction_theta_full 0.997
_diffrn_measured_fraction_theta_max 0.997
_diffrn_measurement_device_type  'Bruker X8 APEX II'
_diffrn_measurement_method       'area detector'
_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  0.0429
_diffrn_reflns_av_sigmaI/netI    0.0378
_diffrn_reflns_limit_h_max       11
_diffrn_reflns_limit_h_min       -8
_diffrn_reflns_limit_k_max       27
_diffrn_reflns_limit_k_min       -17
_diffrn_reflns_limit_l_max       30
_diffrn_reflns_limit_l_min       -30
_diffrn_reflns_number            39833
_diffrn_reflns_theta_full        29.96
_diffrn_reflns_theta_max         29.96
_diffrn_reflns_theta_min         1.41
_exptl_absorpt_coefficient_mu    3.192
_exptl_absorpt_correction_T_max  0.528
_exptl_absorpt_correction_T_min  0.261
_exptl_absorpt_correction_type   multi-scan
_exptl_absorpt_process_details   'SADABS (Sheldrick, 2008)'
_exptl_crystal_colour            colourless
_exptl_crystal_density_diffrn    1.419
_exptl_crystal_density_method    'not measured'
_exptl_crystal_description       cube
_exptl_crystal_F_000             1552
_exptl_crystal_size_max          0.50
_exptl_crystal_size_mid          0.50
_exptl_crystal_size_min          0.20
_refine_diff_density_max         0.878
_refine_diff_density_min         -1.193
_refine_diff_density_rms         0.091
_refine_ls_extinction_method     none
_refine_ls_goodness_of_fit_ref   1.029
_refine_ls_hydrogen_treatment    mixed
_refine_ls_matrix_type           full
_refine_ls_number_parameters     397
_refine_ls_number_reflns         10316
_refine_ls_number_restraints     0
_refine_ls_restrained_S_all      1.029
_refine_ls_R_factor_all          0.0299
_refine_ls_R_factor_gt           0.0224
_refine_ls_shift/su_max          0.004
_refine_ls_shift/su_mean         0.000
_refine_ls_structure_factor_coef Fsqd
_refine_ls_weighting_details
'calc w=1/[\s^2^(Fo^2^)+(0.0113P)^2^+1.7372P] where P=(Fo^2^+2Fc^2^)/3'
_refine_ls_weighting_scheme      calc
_refine_ls_wR_factor_gt          0.0472
_refine_ls_wR_factor_ref         0.0496
_reflns_number_gt                8920
_reflns_number_total             10316
_reflns_threshold_expression     >2\s(I)
_cod_data_source_file            c1dt11595b.txt
_cod_data_source_block           ls206
_cod_original_sg_symbol_H-M      'P 21/c'
_cod_database_code               7017872