Reactivity of niobium(v) and tantalum(v) halides with carbonyl compounds: synthesis of simple coordination adducts, C-H bond activation, C=O protonation, and halide transfer.
Marchetti, Fabio; Pampaloni, Guido; Zacchini, Stefano; Dalton transactions (Cambridge, England : 2003)  (2007) 4343–4351; doi:10.1039/b708531a

data_7006052
_publ_section_title
;
 Reactivity of niobium(v) and tantalum(v) halides with carbonyl
 compounds: synthesis of simple coordination adducts, C-H bond
 activation, C=O protonation, and halide transfer.
;
_journal_issue                   38
_journal_name_full
'Dalton transactions (Cambridge, England : 2003)'
_journal_page_first              4343
_journal_page_last               4351
_journal_paper_doi               10.1039/b708531a
_journal_year                    2007
_chemical_formula_sum            'C6 H11 Cl4 O2 Ta'
_chemical_formula_weight         437.90
_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                 102.753(2)
_cell_angle_gamma                90.00
_cell_formula_units_Z            4
_cell_length_a                   6.7058(12)
_cell_length_b                   15.462(3)
_cell_length_c                   12.189(2)
_cell_measurement_reflns_used    5147
_cell_measurement_temperature    100(2)
_cell_measurement_theta_max      28.456
_cell_measurement_theta_min      2.6345
_cell_volume                     1232.6(4)
_computing_structure_refinement  'SHELXL-97 (Sheldrick, 1997)'
_computing_structure_solution    'SHELXS-97 (Sheldrick, 1990)'
_diffrn_ambient_temperature      100(2)
_diffrn_measured_fraction_theta_full 0.999
_diffrn_measured_fraction_theta_max 0.999
_diffrn_measurement_device_type  'CCD area detector'
_diffrn_measurement_method       'phi and omega 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  0.0375
_diffrn_reflns_av_sigmaI/netI    0.0280
_diffrn_reflns_limit_h_max       8
_diffrn_reflns_limit_h_min       -8
_diffrn_reflns_limit_k_max       19
_diffrn_reflns_limit_k_min       -19
_diffrn_reflns_limit_l_max       15
_diffrn_reflns_limit_l_min       -15
_diffrn_reflns_number            13011
_diffrn_reflns_theta_full        27.00
_diffrn_reflns_theta_max         27.00
_diffrn_reflns_theta_min         2.16
_exptl_absorpt_coefficient_mu    9.752
_exptl_absorpt_correction_T_max  0.3045
_exptl_absorpt_correction_T_min  0.2031
_exptl_absorpt_correction_type   empirical
_exptl_crystal_colour            colourless
_exptl_crystal_density_diffrn    2.360
_exptl_crystal_density_method    'not measured'
_exptl_crystal_description       rod
_exptl_crystal_F_000             816
_exptl_crystal_size_max          0.24
_exptl_crystal_size_mid          0.18
_exptl_crystal_size_min          0.16
_refine_diff_density_max         1.764
_refine_diff_density_min         -1.203
_refine_diff_density_rms         0.154
_refine_ls_extinction_method     none
_refine_ls_goodness_of_fit_ref   1.116
_refine_ls_hydrogen_treatment    constr
_refine_ls_matrix_type           full
_refine_ls_number_parameters     121
_refine_ls_number_reflns         2700
_refine_ls_number_restraints     0
_refine_ls_restrained_S_all      1.116
_refine_ls_R_factor_all          0.0231
_refine_ls_R_factor_gt           0.0221
_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^)+(0.0285P)^2^+1.9818P] where P=(Fo^2^+2Fc^2^)/3'
_refine_ls_weighting_scheme      calc
_refine_ls_wR_factor_gt          0.0577
_refine_ls_wR_factor_ref         0.0583
_reflns_number_gt                2597
_reflns_number_total             2700
_reflns_threshold_expression     >2sigma(I)
_cod_data_source_file            b708531a.txt
_cod_data_source_block           tacl
_cod_original_cell_volume        1232.7(4)
_cod_original_sg_symbol_H-M      P2(1)/c
_cod_database_code               7006052