Pnictogen-Hydride Activation by (silox)3Ta (silox =tBu3SiO); Attempts to Circumvent the Constraints of Orbital Symmetry in N2 Activation
Elliott B. Hulley; Jeffrey B. Bonanno; Peter T. Wolczanski; Thomas R. Cundari; Emil B. Lobkovsky; Inorganic Chemistry 49 (2010) 8524–8544; doi:10.1021/ic101147x

data_4316536
_publ_section_title
;
 Pnictogen-Hydride Activation by (silox)3Ta (silox =tBu3SiO); Attempts to
 Circumvent the Constraints of Orbital Symmetry in N2 Activation
;
_journal_name_full               'Inorganic Chemistry'
_journal_page_first              8524
_journal_page_last               8544
_journal_paper_doi               10.1021/ic101147x
_journal_volume                  49
_journal_year                    2010
_chemical_formula_sum            'C42 H86 N O3 Si3 Ta'
_chemical_formula_weight         918.34
_chemical_name_systematic
; 
 ? 
;
_space_group_IT_number           33
_symmetry_cell_setting           orthorhombic
_symmetry_space_group_name_Hall  'P 2c -2n'
_symmetry_space_group_name_H-M   'P n a 21'
_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                   18.114(4)
_cell_length_b                   13.436(3)
_cell_length_c                   20.650(4)
_cell_measurement_temperature    293(2)
_cell_volume                     5025.8(19)
_computing_structure_refinement  'SHELXL-97 (Sheldrick, 1997)'
_computing_structure_solution    'SHELXS-97 (Sheldrick, 1990)'
_diffrn_ambient_temperature      293(2)
_diffrn_measured_fraction_theta_full 0.988
_diffrn_measured_fraction_theta_max 0.988
_diffrn_radiation_monochromator  graphite
_diffrn_radiation_source         'fine-focus sealed tube'
_diffrn_radiation_type           MoK\a
_diffrn_radiation_wavelength     0.71069
_diffrn_reflns_av_R_equivalents  0.0254
_diffrn_reflns_av_sigmaI/netI    0.0460
_diffrn_reflns_limit_h_max       21
_diffrn_reflns_limit_h_min       -1
_diffrn_reflns_limit_k_max       15
_diffrn_reflns_limit_k_min       -1
_diffrn_reflns_limit_l_max       1
_diffrn_reflns_limit_l_min       -24
_diffrn_reflns_number            5077
_diffrn_reflns_theta_full        25.04
_diffrn_reflns_theta_max         25.04
_diffrn_reflns_theta_min         1.81
_exptl_absorpt_coefficient_mu    2.291
_exptl_crystal_density_diffrn    1.214
_exptl_crystal_density_method    'not measured'
_exptl_crystal_F_000             1936
_refine_diff_density_max         1.138
_refine_diff_density_min         -0.523
_refine_diff_density_rms         0.092
_refine_ls_abs_structure_details 'Flack H D (1983), Acta Cryst. A39, 876-881'
_refine_ls_abs_structure_Flack   0.006(19)
_refine_ls_extinction_method     none
_refine_ls_goodness_of_fit_ref   1.080
_refine_ls_hydrogen_treatment    mixed
_refine_ls_matrix_type           full
_refine_ls_number_parameters     482
_refine_ls_number_reflns         4665
_refine_ls_number_restraints     1
_refine_ls_restrained_S_all      1.079
_refine_ls_R_factor_all          0.0733
_refine_ls_R_factor_gt           0.0415
_refine_ls_shift/su_max          2.002
_refine_ls_shift/su_mean         0.122
_refine_ls_structure_factor_coef Fsqd
_refine_ls_weighting_details
'calc w=1/[\s^2^(Fo^2^)+(0.0549P)^2^+7.4307P] where P=(Fo^2^+2Fc^2^)/3'
_refine_ls_weighting_scheme      calc
_refine_ls_wR_factor_gt          0.0976
_refine_ls_wR_factor_ref         0.1186
_reflns_number_gt                3371
_reflns_number_total             4665
_reflns_threshold_expression     >2sigma(I)
_cod_data_source_file            ic101147x_si_001_1.cif
_cod_data_source_block           imido5
_cod_database_code               4316536