Trialkyl imido niobium and tantalum compounds: synthesis, structural study and migratory insertion reactions.
Galajov, Miguel; García, Carlos; Gómez, Manuel; Gómez-Sal, Pilar; Dalton transactions (Cambridge, England : 2003) 40 (2011) 2797–2804; doi:10.1039/c0dt01449d

data_7015287
_publ_section_title
;
 Trialkyl imido niobium and tantalum compounds: synthesis, structural
 study and migratory insertion reactions.
;
_journal_issue                   12
_journal_name_full
'Dalton transactions (Cambridge, England : 2003)'
_journal_page_first              2797
_journal_page_last               2804
_journal_paper_doi               10.1039/c0dt01449d
_journal_volume                  40
_journal_year                    2011
_chemical_compound_source        'synthesis as described'
_chemical_formula_moiety         'C28 H75 N1 O2 Si6 Ta2'
_chemical_formula_sum            'C28 H75 N O2 Si6 Ta2'
_chemical_formula_weight         988.33
_chemical_name_systematic
;
?
;
_space_group_IT_number           2
_symmetry_cell_setting           triclinic
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_audit_creation_method           'WinGX routine CIF_UPDATE'
_cell_angle_alpha                93.650(10)
_cell_angle_beta                 94.013(9)
_cell_angle_gamma                105.789(9)
_cell_formula_units_Z            2
_cell_length_a                   11.102(2)
_cell_length_b                   14.161(3)
_cell_length_c                   15.7690(10)
_cell_measurement_reflns_used    286
_cell_measurement_temperature    200(2)
_cell_measurement_theta_max      18.17
_cell_measurement_theta_min      3.45
_cell_measurement_wavelength     0.71073
_cell_volume                     2370.9(7)
_computing_cell_refinement
'Dirax/lsq (Duisenberg & Schreurs, 1989-2000)'
_computing_data_collection       'Collect (Bruker AXS BV, 1997-2004)'
_computing_data_reduction        'EvalCCD (Duisenberg & Schreurs 1990-2000)'
_computing_molecular_graphics    'Ortep-3 for Windows (Farrugia, 1997)'
_computing_publication_material  'WinGX publication routines (Farrugia, 1999)'
_computing_structure_refinement  'SHELXL-97 (Sheldrick, 2008)'
_computing_structure_solution    'SIR97 (Giacovazzo et al, 1997)'
_diffrn_ambient_temperature      200(2)
_diffrn_detector                 'CCD plate'
_diffrn_detector_area_resol_mean 9
_diffrn_measured_fraction_theta_full 0.963
_diffrn_measured_fraction_theta_max 0.963
_diffrn_measurement_device       '95mm CCD camera on \k-goniostat'
_diffrn_measurement_device_type  KappaCCD
_diffrn_measurement_method       'CCD rotation images, thick slices'
_diffrn_orient_matrix_type       X=UH
_diffrn_orient_matrix_UB_11      0.01
_diffrn_orient_matrix_UB_12      0
_diffrn_orient_matrix_UB_13      0
_diffrn_orient_matrix_UB_21      0
_diffrn_orient_matrix_UB_22      0.01
_diffrn_orient_matrix_UB_23      0
_diffrn_orient_matrix_UB_31      0
_diffrn_orient_matrix_UB_32      0
_diffrn_orient_matrix_UB_33      0.01
_diffrn_radiation_monochromator  graphite
_diffrn_radiation_probe          x-ray
_diffrn_radiation_type           MoK\a
_diffrn_radiation_wavelength     0.71069
_diffrn_reflns_av_R_equivalents  0.083
_diffrn_reflns_av_unetI/netI     0.1921
_diffrn_reflns_limit_h_max       13
_diffrn_reflns_limit_h_min       -14
_diffrn_reflns_limit_k_max       18
_diffrn_reflns_limit_k_min       -18
_diffrn_reflns_limit_l_max       20
_diffrn_reflns_limit_l_min       -20
_diffrn_reflns_number            17615
_diffrn_reflns_reduction_process
;
Scaled and merged with Sortav
R.H. Blessing, (1987) Cryst. Rev. 1, 3-58
R.H. Blessing, (1989) J. Appl. Cryst. 22, 396-397
;
_diffrn_reflns_theta_full        27.5
_diffrn_reflns_theta_max         27.5
_diffrn_reflns_theta_min         3
_diffrn_source                   'Enraf Nonius FR590'
_exptl_absorpt_coefficient_mu    4.784
_exptl_absorpt_correction_T_max  0.116
_exptl_absorpt_correction_T_min  0.06
_exptl_absorpt_correction_type   multi-scan
_exptl_absorpt_process_details
;
R.H. Blessing, Acta Cryst. (1995), A51, 33-38
;
_exptl_crystal_colour            colourless
_exptl_crystal_density_diffrn    1.384
_exptl_crystal_density_method    'not measured'
_exptl_crystal_description       prism
_exptl_crystal_F_000             992
_exptl_crystal_size_max          0.5
_exptl_crystal_size_mid          0.5
_exptl_crystal_size_min          0.25
_refine_diff_density_max         3.18
_refine_diff_density_min         -3.27
_refine_diff_density_rms         0.242
_refine_ls_extinction_method     none
_refine_ls_goodness_of_fit_ref   0.888
_refine_ls_hydrogen_treatment    constr
_refine_ls_matrix_type           full
_refine_ls_number_parameters     352
_refine_ls_number_reflns         10494
_refine_ls_number_restraints     0
_refine_ls_restrained_S_all      0.888
_refine_ls_R_factor_all          0.1259
_refine_ls_R_factor_gt           0.0637
_refine_ls_shift/su_max          0.003
_refine_ls_shift/su_mean         0
_refine_ls_structure_factor_coef Fsqd
_refine_ls_weighting_details
'calc w=1/[\s^2^(Fo^2^)+(0.0000P)^2^+0.0000P] where P=(Fo^2^+2Fc^2^)/3'
_refine_ls_weighting_scheme      calc
_refine_ls_wR_factor_gt          0.1368
_refine_ls_wR_factor_ref         0.171
_reflns_number_gt                5877
_reflns_number_total             10494
_reflns_threshold_expression     >2\s(I)
_cod_data_source_file            c0dt01449d.txt
_cod_data_source_block           import
_cod_original_sg_symbol_Hall     'P -1'
_cod_database_code               7015287