'Pincer' dicarbene complexes of some early transition metals and uranium.
Pugh, David; Wright, Joseph A.; Freeman, Sandra; Danopoulos, Andreas A.; Dalton transactions (Cambridge, England : 2003)  (2006) 775–782; doi:10.1039/b512133g

data_7006598
_publ_section_title
;
 'Pincer' dicarbene complexes of some early transition metals and
 uranium.
;
_journal_issue                   6
_journal_name_full
'Dalton transactions (Cambridge, England : 2003)'
_journal_page_first              775
_journal_page_last               782
_journal_paper_doi               10.1039/b512133g
_journal_year                    2006
_chemical_formula_moiety         'C35 H41 Cl3 N5 Nb, C4 H8 O'
_chemical_formula_sum            'C39 H49 Cl3 N5 Nb O'
_chemical_formula_weight         803.09
_chemical_name_systematic
;
?
;
_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                 92.61(6)
_cell_angle_gamma                90.00
_cell_formula_units_Z            4
_cell_length_a                   10.803(7)
_cell_length_b                   18.707(11)
_cell_length_c                   18.838(17)
_cell_measurement_reflns_used    8081
_cell_measurement_temperature    120(2)
_cell_measurement_theta_max      27.48
_cell_measurement_theta_min      2.91
_cell_volume                     3803(5)
_computing_cell_refinement
'DENZO (Otwinowski & Minor, 1997) & COLLECT (Hooft, R.W.W., 1998)'
_computing_data_collection       'COLLECT (Hooft, R.W.W., 1998)'
_computing_data_reduction
'DENZO (Otwinowski & Minor, 1997) & COLLECT (Hooft, R.W.W., 1998)'
_computing_molecular_graphics    'ORTEP-3 (Farrugia, 1997)'
_computing_publication_material
;
PLATON (Spek, 2003)
ENCIFER (Allen, 2004)
;
_computing_structure_refinement  'SHELXL-97 (Sheldrick, 1997)'
_computing_structure_solution    'SIR92 (Altomare, 1992)'
_diffrn_ambient_temperature      120(2)
_diffrn_detector_area_resol_mean 9.091
_diffrn_measured_fraction_theta_full 0.993
_diffrn_measured_fraction_theta_max 0.993
_diffrn_measurement_device_type
'Bruker-Nonius 95mm CCD camera on \k-goniostat'
_diffrn_measurement_method       '\f & \w scans'
_diffrn_radiation_monochromator  '10cm confocal mirrors'
_diffrn_radiation_source         'Bruker-Nonius FR591 rotating anode'
_diffrn_radiation_type           MoK\a
_diffrn_radiation_wavelength     0.71073
_diffrn_reflns_av_R_equivalents  0.1325
_diffrn_reflns_av_sigmaI/netI    0.1954
_diffrn_reflns_limit_h_max       14
_diffrn_reflns_limit_h_min       -13
_diffrn_reflns_limit_k_max       24
_diffrn_reflns_limit_k_min       -23
_diffrn_reflns_limit_l_max       18
_diffrn_reflns_limit_l_min       -24
_diffrn_reflns_number            26634
_diffrn_reflns_theta_full        27.56
_diffrn_reflns_theta_max         27.56
_diffrn_reflns_theta_min         3.77
_diffrn_standards_number         0
_exptl_absorpt_coefficient_mu    0.565
_exptl_absorpt_correction_T_max  0.9944
_exptl_absorpt_correction_T_min  0.6249
_exptl_absorpt_correction_type   multi-scan
_exptl_absorpt_process_details   'SADABS V2.10 (Sheldrick, G.M., 2003)'
_exptl_crystal_colour            'dark blue'
_exptl_crystal_density_diffrn    1.403
_exptl_crystal_density_method    'not measured'
_exptl_crystal_description       block
_exptl_crystal_F_000             1672
_exptl_crystal_size_max          0.06
_exptl_crystal_size_mid          0.04
_exptl_crystal_size_min          0.01
_refine_diff_density_max         1.069
_refine_diff_density_min         -0.512
_refine_diff_density_rms         0.099
_refine_ls_extinction_method     none
_refine_ls_goodness_of_fit_ref   1.012
_refine_ls_hydrogen_treatment    constr
_refine_ls_matrix_type           full
_refine_ls_number_parameters     460
_refine_ls_number_reflns         8730
_refine_ls_number_restraints     8
_refine_ls_restrained_S_all      1.013
_refine_ls_R_factor_all          0.1973
_refine_ls_R_factor_gt           0.0902
_refine_ls_shift/su_max          0.000
_refine_ls_shift/su_mean         0.000
_refine_ls_structure_factor_coef Fsqd
_refine_ls_weighting_details
'calc w=1/[\s^2^(Fo^2^)+(0.0444P)^2^+5.6157P] where P=(Fo^2^+2Fc^2^)/3'
_refine_ls_weighting_scheme      calc
_refine_ls_wR_factor_gt          0.1446
_refine_ls_wR_factor_ref         0.1774
_reflns_number_gt                4281
_reflns_number_total             8730
_reflns_threshold_expression     >2sigma(I)
_cod_data_source_file            b512133g.txt
_cod_data_source_block           4
_cod_original_sg_symbol_H-M      P21/c
_cod_database_code               7006598