Heterobimetallic Complexes Comprised of Nb and Fe: Isolation of a Coordinatively Unsaturated Nb<sup>III</sup>/Fe<sup>0</sup> Bimetallic Complex Featuring a Nb≡Fe Triple Bond.
Culcu, Gursu; Iovan, Diana A.; Krogman, Jeremy P.; Wilding, Matthew J. T.; Bezpalko, Mark W.; Foxman, Bruce M.; Thomas, Christine M.; Journal of the American Chemical Society 139 (2017) 9627–9636; doi:10.1021/jacs.7b04151

data_4131322
_publ_section_title
;
 Heterobimetallic Complexes Comprised of Nb and Fe: Isolation of a
 Coordinatively Unsaturated Nb<sup>III</sup>/Fe<sup>0</sup> Bimetallic
 Complex Featuring a Nb\\tb Fe Triple Bond.
;
_journal_issue                   28
_journal_name_full               'Journal of the American Chemical Society'
_journal_page_first              9627
_journal_page_last               9636
_journal_paper_doi               10.1021/jacs.7b04151
_journal_volume                  139
_journal_year                    2017
_chemical_formula_moiety         'C48 H60 Fe1 N3 Nb1 P4'
_chemical_formula_sum            'C48 H60 Fe N3 Nb P4'
_chemical_formula_weight         951.67
_space_group_IT_number           205
_space_group_name_Hall           '-P 2ac 2ab 3'
_space_group_name_H-M_alt        'P a -3'
_symmetry_cell_setting           cubic
_symmetry_space_group_name_Hall  '-P 2ac 2ab 3'
_symmetry_space_group_name_H-M   'P a -3'
_atom_sites_solution_hydrogens   difmap
_atom_sites_solution_primary     direct
_audit_creation_date             2017-02-02
_audit_creation_method           CRYSTALS_ver_14.61_build_00000
_cell_angle_alpha                90
_cell_angle_beta                 90
_cell_angle_gamma                90
_cell_formula_units_Z            8
_cell_length_a                   21.1756(7)
_cell_length_b                   21.1756(7)
_cell_length_c                   21.1756(7)
_cell_measurement_reflns_used    3249
_cell_measurement_temperature    120
_cell_measurement_theta_max      24
_cell_measurement_theta_min      2
_cell_volume                     9495.3(5)
_computing_cell_refinement       'Apex2 (Bruker AXS, 2006)'
_computing_data_collection       'Apex2 (Bruker AXS, 2006)'
_computing_data_reduction        'Apex2 (Bruker AXS, 2006)'
_computing_molecular_graphics    'CAMERON (Watkin et al., 1996)'
_computing_publication_material  'CRYSTALS (Betteridge et al., 2003)'
_computing_structure_refinement  'CRYSTALS (Betteridge et al., 2003)'
_computing_structure_solution    'SIR92 (Altomare et al., 1994)'
_diffrn_ambient_temperature      120
_diffrn_measured_fraction_theta_full 0.999
_diffrn_measured_fraction_theta_max 0.999
_diffrn_measurement_device       Area
_diffrn_measurement_device_type  'Bruker Kappa Apex2'
_diffrn_measurement_method       '\f & \w scans'
_diffrn_radiation_monochromator  graphite
_diffrn_radiation_type           'Mo K\a'
_diffrn_radiation_wavelength     0.71073
_diffrn_reflns_av_R_equivalents  0.091
_diffrn_reflns_limit_h_max       17
_diffrn_reflns_limit_h_min       -25
_diffrn_reflns_limit_k_max       25
_diffrn_reflns_limit_k_min       -25
_diffrn_reflns_limit_l_max       22
_diffrn_reflns_limit_l_min       -17
_diffrn_reflns_number            27279
_diffrn_reflns_theta_full        25.684
_diffrn_reflns_theta_max         25.684
_diffrn_reflns_theta_min         1.666
_diffrn_standards_number         0
_exptl_absorpt_coefficient_mu    0.717
_exptl_absorpt_correction_T_max  0.92
_exptl_absorpt_correction_T_min  0.89
_exptl_absorpt_correction_type   numerical
_exptl_absorpt_process_details
; 
 Analytical Absorption (De Meulenaer & Tompa, 1965) 
;
_exptl_crystal_colour            red
_exptl_crystal_density_diffrn    1.331
_exptl_crystal_density_method    'not measured'
_exptl_crystal_description       prism
_exptl_crystal_F_000             3968.000
_exptl_crystal_size_max          0.240
_exptl_crystal_size_mid          0.160
_exptl_crystal_size_min          0.120
_refine_diff_density_max         1.29
_refine_diff_density_min         -0.91
_refine_ls_extinction_method     None
_refine_ls_goodness_of_fit_ref   1.0091
_refine_ls_hydrogen_treatment    constr
_refine_ls_matrix_type           full
_refine_ls_number_parameters     172
_refine_ls_number_reflns         3024
_refine_ls_number_restraints     0
_refine_ls_R_factor_all          0.0608
_refine_ls_R_factor_gt           0.0337
_refine_ls_shift/su_max          0.0008726
_refine_ls_shift/su_mean         0.0000585
_refine_ls_structure_factor_coef Fsqd
_refine_ls_weighting_details
;
 Method= Modified Sheldrick 
 w=1/[\s^2^(F^2^) + ( 0.02P)^2^ + 9.45P] 
 ,where P=(max(Fo^2^,0) + 2Fc^2^)/3 
;
_refine_ls_weighting_scheme      calc
_refine_ls_wR_factor_all         0.0662
_refine_ls_wR_factor_gt          0.0578
_refine_ls_wR_factor_ref         0.0662
_reflns_limit_h_max              17
_reflns_limit_h_min              0
_reflns_limit_k_max              18
_reflns_limit_k_min              0
_reflns_limit_l_max              25
_reflns_limit_l_min              1
_reflns_number_gt                2213
_reflns_number_total             3024
_reflns_threshold_expression     I>2.0\s(I)
_oxford_diffrn_Wilson_B_factor   0.00
_oxford_diffrn_Wilson_scale      0.00
_oxford_refine_ls_r_factor_ref   0.0608
_oxford_refine_ls_scale          0.044301(4)
_oxford_reflns_number_all        3024
_oxford_reflns_threshold_expression_ref I>-10.0\s(I)
_oxford_structure_analysis_title 'gc_05_420b_0ma in Pa-3'
_cod_data_source_file            ja7b04151_si_002.cif
_cod_data_source_block           6
_cod_original_cell_volume        9495.3(9)
_cod_original_sg_symbol_H-M      'P a -3 '
_cod_original_formula_sum        'C48 H60 Fe1 N3 Nb1 P4'
_cod_database_code               4131322