Amine−Phenolate Ligands in Niobium Chemistry: π-Interactions Probed by an Ancillary Alkyne Ligand
Despagnet-Ayoub, Emmanuelle; Schigand, Sophie; Vendier, Laure; Etienne, Michel; Organometallics 28 (2009) 2188–; doi:10.1021/om801139m

data_4068868
_publ_section_title
;
 Amine&#x2212;Phenolate Ligands in Niobium Chemistry: \p-Interactions
 Probed by an Ancillary Alkyne Ligand
;
_journal_issue                   7
_journal_name_full               Organometallics
_journal_page_first              2188
_journal_paper_doi               10.1021/om801139m
_journal_volume                  28
_journal_year                    2009
_chemical_absolute_configuration ad
_chemical_compound_source        'synthesis as described'
_chemical_formula_moiety         'C26 H36 Cl1 N2 Nb1 O2'
_chemical_formula_sum            'C26 H36 Cl N2 Nb O2'
_chemical_formula_weight         536.93
_chemical_name_systematic
;
 ?
;
_space_group_IT_number           33
_symmetry_cell_setting           orthorhombic
_symmetry_Int_Tables_number      33
_symmetry_space_group_name_Hall  'P -2n -2ac'
_symmetry_space_group_name_H-M   'P c 21 n'
_atom_sites_solution_hydrogens   geom
_atom_sites_solution_primary     direct
_atom_sites_solution_secondary   difmap
_cell_angle_alpha                90
_cell_angle_beta                 90
_cell_angle_gamma                90
_cell_formula_units_Z            4
_cell_length_a                   12.0690(9)
_cell_length_b                   14.3034(12)
_cell_length_c                   15.0363(12)
_cell_measurement_reflns_used    6000
_cell_measurement_temperature    180
_cell_measurement_theta_max      26.05
_cell_measurement_theta_min      1.65
_cell_measurement_wavelength     0.71073
_cell_volume                     2595.7(4)
_computing_cell_refinement       'Stoe IPDS software (Stoe, 1996)'
_computing_data_collection       'Stoe IPDS software (Stoe, 1996)'
_computing_data_reduction        'XRED (Stoe, 1.08, 1996)'
_computing_molecular_graphics    'Ortep-3 for Windows (Farrugia, 1997)'
_computing_publication_material  'WinGX publication routines (Farrugia, 1999)'
_computing_structure_refinement  'SHELXL-97 (Sheldrick, 1997)'
_computing_structure_solution    'SIR92 (Giacovazzo et al, 1993)'
_diffrn_ambient_temperature      180
_diffrn_measured_fraction_theta_full 0.994
_diffrn_measured_fraction_theta_max 0.994
_diffrn_measurement_device       'Stoe IPDS'
_diffrn_measurement_method       \f
_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  0.1209
_diffrn_reflns_av_unetI/netI     0.1034
_diffrn_reflns_limit_h_max       14
_diffrn_reflns_limit_h_min       -14
_diffrn_reflns_limit_k_max       15
_diffrn_reflns_limit_k_min       -17
_diffrn_reflns_limit_l_max       18
_diffrn_reflns_limit_l_min       -18
_diffrn_reflns_number            13988
_diffrn_reflns_theta_full        25.99
_diffrn_reflns_theta_max         25.99
_diffrn_reflns_theta_min         2.16
_diffrn_standards_decay_%        0.1
_diffrn_standards_interval_time  4
_diffrn_standards_number         200
_exptl_absorpt_coefficient_mu    0.591
_exptl_absorpt_correction_T_max  0.941
_exptl_absorpt_correction_T_min  0.871
_exptl_absorpt_correction_type   refdelf
_exptl_absorpt_process_details
;
        (See: Walker, N. & Stuart, D. (1983) Acta Cryst. A39, 158-166)
;
_exptl_crystal_colour            yellow
_exptl_crystal_density_diffrn    1.374
_exptl_crystal_density_method    'not measured'
_exptl_crystal_description       block
_exptl_crystal_F_000             1120
_exptl_crystal_size_max          0.25
_exptl_crystal_size_mid          0.2
_exptl_crystal_size_min          0.1
_refine_diff_density_max         1.103
_refine_diff_density_min         -0.642
_refine_diff_density_rms         0.105
_refine_ls_abs_structure_details 'Flack H D (1983), Acta Cryst. A39, 876-881'
_refine_ls_abs_structure_Flack   -0.01(6)
_refine_ls_extinction_method     none
_refine_ls_goodness_of_fit_ref   0.96
_refine_ls_hydrogen_treatment    constr
_refine_ls_matrix_type           full
_refine_ls_number_parameters     297
_refine_ls_number_reflns         4779
_refine_ls_number_restraints     1
_refine_ls_restrained_S_all      0.96
_refine_ls_R_factor_all          0.0939
_refine_ls_R_factor_gt           0.0622
_refine_ls_shift/su_max          0
_refine_ls_shift/su_mean         0
_refine_ls_structure_factor_coef Fsqd
_refine_ls_weighting_details
'calc w=1/[\s^2^(Fo^2^)+(0.0604P)^2^+0.0000P] where P=(Fo^2^+2Fc^2^)/3'
_refine_ls_weighting_scheme      calc
_refine_ls_wR_factor_gt          0.1032
_refine_ls_wR_factor_ref         0.1136
_reflns_number_gt                3453
_reflns_number_total             4779
_reflns_threshold_expression     >2\s(I)
_cod_data_source_file            om801139m_si_001.cif
_cod_data_source_block           EAD0125
_cod_database_code               4068868