Halo, Alkyl, Aryl, and Bis(imido) Complexes of Niobium Supported by the beta-Diketiminato Ligand.
Tomson, Neil C.; Arnold, John; Bergman, Robert G.; Organometallics 29 (2010) 2926–2942; doi:10.1021/om1001827

data_4065890
_publ_section_title
;
 Halo, Alkyl, Aryl, and Bis(imido) Complexes of Niobium Supported by the
 beta-Diketiminato Ligand.
;
_journal_issue                   13
_journal_name_full               Organometallics
_journal_page_first              2926
_journal_page_last               2942
_journal_paper_doi               10.1021/om1001827
_journal_volume                  29
_journal_year                    2010
_chemical_formula_moiety         'C40 H57 Cl N3 Nb'
_chemical_formula_sum            'C40 H57 Cl N3 Nb'
_chemical_formula_weight         708.25
_chemical_name_systematic
; 
 ? 
;
_space_group_IT_number           19
_symmetry_cell_setting           orthorhombic
_symmetry_space_group_name_Hall  'P 2ac 2ab'
_symmetry_space_group_name_H-M   'P 21 21 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                   13.757(2)
_cell_length_b                   16.524(3)
_cell_length_c                   17.039(3)
_cell_measurement_reflns_used    3462
_cell_measurement_temperature    122(2)
_cell_measurement_theta_max      44.787
_cell_measurement_theta_min      6.848
_cell_volume                     3873.3(11)
_computing_cell_refinement       'Bruker SAINT v7.07'
_computing_data_collection       'Bruker SMART v5.054d'
_computing_data_reduction        'Bruker SAINT v7.07'
_computing_molecular_graphics    'Bruker-AXS XP v.6'
_computing_publication_material  'Bruker-AXS XP v.6'
_computing_structure_refinement  'SHELXL-97 (Sheldrick, 2008)'
_computing_structure_solution    'SHELXS-97 (Sheldrick, 2008)'
_diffrn_ambient_temperature      122(2)
_diffrn_measured_fraction_theta_full 0.992
_diffrn_measured_fraction_theta_max 0.992
_diffrn_measurement_device_type  'SMART 1000'
_diffrn_measurement_method       '\w 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  0.0626
_diffrn_reflns_av_sigmaI/netI    0.1235
_diffrn_reflns_limit_h_max       16
_diffrn_reflns_limit_h_min       -14
_diffrn_reflns_limit_k_max       19
_diffrn_reflns_limit_k_min       -19
_diffrn_reflns_limit_l_max       16
_diffrn_reflns_limit_l_min       -20
_diffrn_reflns_number            17262
_diffrn_reflns_theta_full        24.70
_diffrn_reflns_theta_max         24.70
_diffrn_reflns_theta_min         3.42
_exptl_absorpt_coefficient_mu    0.409
_exptl_absorpt_correction_T_max  1
_exptl_absorpt_correction_T_min  0.870265
_exptl_absorpt_correction_type   empirical
_exptl_absorpt_process_details   'Blessing, 1995'
_exptl_crystal_colour            orange
_exptl_crystal_density_diffrn    1.215
_exptl_crystal_density_method    'not measured'
_exptl_crystal_description       block
_exptl_crystal_F_000             1504
_exptl_crystal_size_max          0.25
_exptl_crystal_size_mid          0.23
_exptl_crystal_size_min          0.13
_refine_diff_density_max         1.261
_refine_diff_density_min         -0.298
_refine_diff_density_rms         0.071
_refine_ls_abs_structure_details 'Flack H D (1983), Acta Cryst. A39, 876-881'
_refine_ls_abs_structure_Flack   0.53(5)
_refine_ls_extinction_method     none
_refine_ls_goodness_of_fit_ref   0.969
_refine_ls_hydrogen_treatment    mixed
_refine_ls_matrix_type           full
_refine_ls_number_parameters     407
_refine_ls_number_reflns         6488
_refine_ls_number_restraints     0
_refine_ls_restrained_S_all      0.969
_refine_ls_R_factor_all          0.0617
_refine_ls_R_factor_gt           0.0473
_refine_ls_shift/su_max          0.003
_refine_ls_shift/su_mean         0.000
_refine_ls_structure_factor_coef Fsqd
_refine_ls_weighting_details
'calc w=1/[\s^2^(Fo^2^)+(0.0000P)^2^+0.0000P] where P=(Fo^2^+2Fc^2^)/3'
_refine_ls_weighting_scheme      calc
_refine_ls_wR_factor_gt          0.1137
_refine_ls_wR_factor_ref         0.1239
_reflns_number_gt                5497
_reflns_number_total             6488
_reflns_threshold_expression     >2sigma(I)
_cod_data_source_file            om1001827_si_002.cif
_cod_data_source_block           (BDI)Cl(ptol)Nb(NtBu)
_cod_original_sg_symbol_H-M      'P 2(1) 2(1) 2(1)'
_cod_database_code               4065890