New iso-propoxides, tert-butoxides and neo-pentoxides of niobium(v): Synthesis, structure, characterization and stabilization by trifluoroheteroarylalkenolates and pyridine ligands.
Appel, Linus; Fiz, Raquel; Tyrra, Wieland; Mathur, Sanjay; Dalton transactions (Cambridge, England : 2003) 41 (2012) 1981–1990; doi:10.1039/c1dt11668a

data_7017920
_publ_section_title
;
 New iso-propoxides, tert-butoxides and neo-pentoxides of niobium(v):
 Synthesis, structure, characterization and stabilization by
 trifluoroheteroarylalkenolates and pyridine ligands.
;
_journal_issue                   7
_journal_name_full
'Dalton transactions (Cambridge, England : 2003)'
_journal_page_first              1981
_journal_page_last               1990
_journal_paper_doi               10.1039/c1dt11668a
_journal_volume                  41
_journal_year                    2012
_chemical_formula_moiety         'C20 H33 F3 N Nb O5'
_chemical_formula_sum            'C20 H33 F3 N Nb O5'
_chemical_formula_weight         517.38
_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                 116.248(9)
_cell_angle_gamma                90.00
_cell_formula_units_Z            4
_cell_length_a                   8.2345(10)
_cell_length_b                   18.8002(18)
_cell_length_c                   17.923(2)
_cell_measurement_reflns_used    22848
_cell_measurement_temperature    170(2)
_cell_measurement_theta_max      54.04
_cell_measurement_theta_min      3.16
_cell_volume                     2488.6(5)
_computing_cell_refinement       'X-Area (Stoe & Cie, 2001)'
_computing_data_collection       'X-Area (Stoe & Cie, 2001)'
_computing_data_reduction        'X-Area (Stoe & Cie, 2001)'
_computing_structure_refinement  'SHELXL-97 (Sheldrick, 1997)'
_computing_structure_solution    'SIR-97 (Altomare et al., 1997)'
_diffrn_ambient_temperature      170(2)
_diffrn_detector_area_resol_mean 'not measured'
_diffrn_measured_fraction_theta_full 0.986
_diffrn_measured_fraction_theta_max 0.986
_diffrn_measurement_device_type  'IPDS II (Stoe & Cie)'
_diffrn_measurement_method       '\w and \f 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  0.0513
_diffrn_reflns_av_sigmaI/netI    0.0844
_diffrn_reflns_limit_h_max       10
_diffrn_reflns_limit_h_min       -10
_diffrn_reflns_limit_k_max       24
_diffrn_reflns_limit_k_min       -24
_diffrn_reflns_limit_l_max       23
_diffrn_reflns_limit_l_min       -9
_diffrn_reflns_number            10813
_diffrn_reflns_theta_full        27.34
_diffrn_reflns_theta_max         27.34
_diffrn_reflns_theta_min         1.67
_diffrn_standards_decay_%        'not measured'
_diffrn_standards_interval_count 'not measured'
_diffrn_standards_interval_time  'not measured'
_diffrn_standards_number         'not measured'
_exptl_absorpt_coefficient_mu    0.533
_exptl_absorpt_correction_type   none
_exptl_crystal_colour            colorless
_exptl_crystal_density_diffrn    1.381
_exptl_crystal_density_method    'not measured'
_exptl_crystal_description       cylinder
_exptl_crystal_F_000             1072
_exptl_crystal_size_max          0.45
_exptl_crystal_size_mid          0.40
_exptl_crystal_size_min          0.35
_exptl_crystal_size_rad          0.10
_refine_diff_density_max         1.271
_refine_diff_density_min         -0.657
_refine_diff_density_rms         0.125
_refine_ls_extinction_coef       0.0073(8)
_refine_ls_extinction_expression Fc^*^=kFc[1+0.001xFc^2^\l^3^/sin(2\q)]^-1/4^
_refine_ls_extinction_method     SHELXL
_refine_ls_goodness_of_fit_ref   0.864
_refine_ls_hydrogen_treatment    constr
_refine_ls_matrix_type           full
_refine_ls_number_parameters     272
_refine_ls_number_reflns         5551
_refine_ls_number_restraints     0
_refine_ls_restrained_S_all      0.864
_refine_ls_R_factor_all          0.0871
_refine_ls_R_factor_gt           0.0561
_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^)+(0.0904P)^2^+0.0000P] where P=(Fo^2^+2Fc^2^)/3'
_refine_ls_weighting_scheme      calc
_refine_ls_wR_factor_gt          0.1407
_refine_ls_wR_factor_ref         0.1512
_reflns_number_gt                3211
_reflns_number_total             5551
_reflns_threshold_expression     >2sigma(I)
_cod_data_source_file            c1dt11668a.txt
_cod_data_source_block           003
_cod_original_sg_symbol_H-M      'P 21/c'
_cod_database_code               7017920