Synthesis and reactivity of cationic niobium and tantalum methyl complexes supported by imido and β-diketiminato ligands.
Tomson, Neil C.; Arnold, John; Bergman, Robert G.; Dalton transactions (Cambridge, England : 2003) 40 (2011) 7718–7729; doi:10.1039/c1dt10202h

data_7016088
_publ_section_title
;
 Synthesis and reactivity of cationic niobium and tantalum methyl
 complexes supported by imido and \b-diketiminato ligands.
;
_journal_issue                   30
_journal_name_full
'Dalton transactions (Cambridge, England : 2003)'
_journal_page_first              7718
_journal_page_last               7729
_journal_paper_doi               10.1039/c1dt10202h
_journal_volume                  40
_journal_year                    2011
_chemical_formula_moiety         C41H62Cl2N4Ta
_chemical_formula_sum            'C41 H62 Cl2 N4 Ta'
_chemical_formula_weight         862.80
_chemical_name_systematic
;
?
;
_space_group_IT_number           2
_symmetry_cell_setting           triclinic
_symmetry_space_group_name_Hall  '-P 1'
_symmetry_space_group_name_H-M   'P -1'
_atom_sites_solution_hydrogens   geom
_atom_sites_solution_primary     direct
_atom_sites_solution_secondary   difmap
_audit_creation_method           SHELXL-97
_cell_angle_alpha                84.9620(10)
_cell_angle_beta                 76.5520(10)
_cell_angle_gamma                74.7490(10)
_cell_formula_units_Z            2
_cell_length_a                   10.4181(10)
_cell_length_b                   12.5964(12)
_cell_length_c                   16.7145(16)
_cell_measurement_reflns_used    7696
_cell_measurement_temperature    134(2)
_cell_measurement_theta_max      52.715
_cell_measurement_theta_min      6.770
_cell_volume                     2057.4(3)
_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, 1997)'
_computing_structure_solution    'SHELXS-97 (Sheldrick, 1990)'
_diffrn_ambient_temperature      134(2)
_diffrn_measured_fraction_theta_full 0.888
_diffrn_measured_fraction_theta_max 0.888
_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  0.0128
_diffrn_reflns_av_sigmaI/netI    0.0247
_diffrn_reflns_limit_h_max       12
_diffrn_reflns_limit_h_min       -12
_diffrn_reflns_limit_k_max       14
_diffrn_reflns_limit_k_min       -15
_diffrn_reflns_limit_l_max       20
_diffrn_reflns_limit_l_min       -16
_diffrn_reflns_number            11261
_diffrn_reflns_theta_full        26.37
_diffrn_reflns_theta_max         26.37
_diffrn_reflns_theta_min         3.38
_diffrn_standards_decay_%        0
_diffrn_standards_interval_count 0
_diffrn_standards_interval_time  0
_diffrn_standards_number         0
_exptl_absorpt_coefficient_mu    2.833
_exptl_absorpt_correction_T_max  1
_exptl_absorpt_correction_T_min  0.840323
_exptl_absorpt_correction_type   empirical
_exptl_absorpt_process_details   'Blessing, 1995'
_exptl_crystal_colour            orange
_exptl_crystal_density_diffrn    1.393
_exptl_crystal_density_method    'not measured'
_exptl_crystal_description       block
_exptl_crystal_F_000             886
_exptl_crystal_size_max          0.28
_exptl_crystal_size_mid          0.24
_exptl_crystal_size_min          0.21
_refine_diff_density_max         2.594
_refine_diff_density_min         -0.641
_refine_diff_density_rms         0.087
_refine_ls_extinction_method     none
_refine_ls_goodness_of_fit_ref   1.267
_refine_ls_hydrogen_treatment    constr
_refine_ls_matrix_type           full
_refine_ls_number_parameters     433
_refine_ls_number_reflns         7455
_refine_ls_number_restraints     0
_refine_ls_restrained_S_all      1.267
_refine_ls_R_factor_all          0.0286
_refine_ls_R_factor_gt           0.0248
_refine_ls_shift/su_max          0.001
_refine_ls_shift/su_mean         0.000
_refine_ls_structure_factor_coef Fsqd
_refine_ls_weighting_details
'calc w=1/[\s^2^(Fo^2^)+(0.0346P)^2^+0.0000P] where P=(Fo^2^+2Fc^2^)/3'
_refine_ls_weighting_scheme      calc
_refine_ls_wR_factor_gt          0.0619
_refine_ls_wR_factor_ref         0.0629
_reflns_number_gt                6827
_reflns_number_total             7455
_reflns_threshold_expression     >2sigma(I)
_cod_data_source_file            c1dt10202h.txt
_cod_data_source_block           n5c145txs
_cod_database_code               7016088