Reaction of (Bisimido)niobium(V) Complexes with Organic Azides: [3 + 2] Cycloaddition and Reversible Cleavage of β-Diketiminato Ligands Involving Nitrene Transfer.
Obenhuber, Andreas H.; Gianetti, Thomas L.; Berrebi, Xavier; Bergman, Robert G.; Arnold, John; Journal of the American Chemical Society 136 (2014) 2994–; doi:10.1021/ja413194z

data_4120630
_publ_section_title
;
 Reaction of (Bisimido)niobium(V) Complexes with Organic Azides: [3 + 2]
 Cycloaddition and Reversible Cleavage of \b-Diketiminato Ligands
 Involving Nitrene Transfer.
;
_journal_issue                   8
_journal_name_full               'Journal of the American Chemical Society'
_journal_page_first              2994
_journal_paper_doi               10.1021/ja413194z
_journal_volume                  136
_journal_year                    2014
_chemical_formula_moiety         'C37 H59 N6 Nb'
_chemical_formula_sum            'C37 H59 N6 Nb'
_chemical_formula_weight         680.81
_chemical_name_common            'Complex 4'
_space_group_IT_number           29
_symmetry_cell_setting           orthorhombic
_symmetry_space_group_name_Hall  'P 2c -2ac'
_symmetry_space_group_name_H-M   'P c a 21'
_atom_sites_solution_hydrogens   geom
_atom_sites_solution_primary     direct
_atom_sites_solution_secondary   difmap
_cell_angle_alpha                90.00
_cell_angle_beta                 90.00
_cell_angle_gamma                90.00
_cell_formula_units_Z            8
_cell_length_a                   24.042(3)
_cell_length_b                   18.1865(19)
_cell_length_c                   17.3262(17)
_cell_measurement_reflns_used    9990
_cell_measurement_temperature    100(2)
_cell_measurement_theta_max      25.29
_cell_measurement_theta_min      2.60
_cell_volume                     7575.7(14)
_computing_cell_refinement       'Bruker APEX2 v.2011.4'
_computing_data_collection       'Bruker APEX2 v.2011.4'
_computing_data_reduction        'Bruker APEX2 v.2011.4'
_computing_molecular_graphics    ORTEP-32
_computing_publication_material  WinGX
_computing_structure_refinement  SHELXL-97
_computing_structure_solution    SIR-92
_diffrn_ambient_temperature      100(2)
_diffrn_detector_area_resol_mean 8.366
_diffrn_measured_fraction_theta_full 1.000
_diffrn_measured_fraction_theta_max 0.999
_diffrn_measurement_device_type  'Bruker APEX-II CCD'
_diffrn_measurement_method       '\f and \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  0.0577
_diffrn_reflns_av_sigmaI/netI    0.0616
_diffrn_reflns_limit_h_max       28
_diffrn_reflns_limit_h_min       -28
_diffrn_reflns_limit_k_max       21
_diffrn_reflns_limit_k_min       -21
_diffrn_reflns_limit_l_max       20
_diffrn_reflns_limit_l_min       -16
_diffrn_reflns_number            51501
_diffrn_reflns_theta_full        25.00
_diffrn_reflns_theta_max         25.37
_diffrn_reflns_theta_min         1.40
_exptl_absorpt_coefficient_mu    0.350
_exptl_absorpt_correction_T_max  0.7452
_exptl_absorpt_correction_T_min  0.6676
_exptl_absorpt_correction_type   multi-scan
_exptl_absorpt_process_details   SADABS
_exptl_crystal_colour            orange
_exptl_crystal_density_diffrn    1.194
_exptl_crystal_density_method    'not measured'
_exptl_crystal_description       plate
_exptl_crystal_F_000             2912
_exptl_crystal_size_max          0.36
_exptl_crystal_size_mid          0.35
_exptl_crystal_size_min          0.04
_refine_diff_density_max         2.208
_refine_diff_density_min         -0.574
_refine_diff_density_rms         0.077
_refine_ls_abs_structure_details 'Flack H D (1983), Acta Cryst. A39, 876-881'
_refine_ls_abs_structure_Flack   -0.01(3)
_refine_ls_extinction_method     none
_refine_ls_goodness_of_fit_ref   1.032
_refine_ls_hydrogen_treatment    constr
_refine_ls_matrix_type           full
_refine_ls_number_parameters     856
_refine_ls_number_reflns         12409
_refine_ls_number_restraints     1
_refine_ls_restrained_S_all      1.032
_refine_ls_R_factor_all          0.0641
_refine_ls_R_factor_gt           0.0454
_refine_ls_shift/su_max          0.007
_refine_ls_shift/su_mean         0.000
_refine_ls_structure_factor_coef Fsqd
_refine_ls_weighting_details
'calc w=1/[\s^2^(Fo^2^)+(0.0487P)^2^+6.1049P] where P=(Fo^2^+2Fc^2^)/3'
_refine_ls_weighting_scheme      calc
_refine_ls_wR_factor_gt          0.0976
_refine_ls_wR_factor_ref         0.1065
_reflns_number_gt                10116
_reflns_number_total             12409
_reflns_threshold_expression     >2sigma(I)
_cod_data_source_file            ja413194z_si_003.cif
_cod_data_source_block           (3)
_cod_depositor_comments
;
The following automatic conversions were performed:

'_symmetry_cell_setting' value 'Orthorhombic' changed to
'orthorhombic' according to
/usr/data/users/saulius/automatic-downloads/current/ACS/lib/dictionaries/cif_core.dic
dictionary named 'cif_core.dic' version 2.4.2 from 2011-04-26.

Automatic conversion script
Id: cif_fix_values 2281 2013-09-26 08:29:07Z andrius 
;
_cod_original_cell_volume        7575.8(14)
_cod_original_sg_symbol_H-M      Pca2(1)
_cod_database_code               4120630