Syntheses and Structures of Asymmetric Bis(silyl) Niobocene Hydrides
Konstantin Yu. Dorogov; Muhammed Yousufuddin; Nam-Nhat Ho; Andrei V. Churakov; Lyudmila G. Kuzmina; Arthur J. Schultz; Sax A. Mason; Judith A. K. Howard; Dmitry A. Lemenovskii; Robert Bau; Georgii I. Nikonov; Inorganic Chemistry 46 (2007) 147–160; doi:10.1021/ic061314b

data_4306963
_publ_contact_author
; Dr Georgii I. Nikonov
  Chemistry Department, Brock University, 
  500 Glenridge Ave., St Catharines, L2S 3A1, 
  ON, Canada
;
_publ_contact_author_email       gnikonov@brocku.ca
_publ_section_title
;
Syntheses and Structures of Asymmetric Bis(silyl) Niobocene Hydrides
;
_journal_name_full               'Inorganic Chemistry'
_journal_page_first              147
_journal_page_last               160
_journal_paper_doi               10.1021/ic061314b
_journal_volume                  46
_journal_year                    2007
_chemical_formula_sum            'C14 H23 Br Cl Nb Si2'
_chemical_formula_weight         455.77
_chemical_name_common
;  
(dimethylbromosilyl)(dimethylchlorosilyl)niobocene hydrid 
;
_chemical_name_systematic
;  
bis(cyclopentadienyl)(dimethylbromosilyl)
(dimethylchlorosilyl)(hydrido) niobium (V) 
;
_space_group_IT_number           62
_symmetry_cell_setting           orthorhombic
_symmetry_space_group_name_Hall  '-P 2ac 2n'
_symmetry_space_group_name_H-M   'P n m a'
_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                 90.00
_cell_angle_gamma                90.00
_cell_formula_units_Z            4
_cell_length_a                   16.6006(5)
_cell_length_b                   13.1582(4)
_cell_length_c                   8.4922(2)
_cell_measurement_temperature    123(2)
_cell_volume                     1854.99(9)
_computing_structure_refinement  'SHELXL-97 (Sheldrick, 1997)'
_computing_structure_solution    'SHELXS-97 (Sheldrick, 1990)'
_diffrn_ambient_temperature      123(2)
_diffrn_measured_fraction_theta_full 0.998
_diffrn_measured_fraction_theta_max 0.998
_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  0.0241
_diffrn_reflns_av_sigmaI/netI    0.0197
_diffrn_reflns_limit_h_max       22
_diffrn_reflns_limit_h_min       -16
_diffrn_reflns_limit_k_max       17
_diffrn_reflns_limit_k_min       -17
_diffrn_reflns_limit_l_max       11
_diffrn_reflns_limit_l_min       -7
_diffrn_reflns_number            12244
_diffrn_reflns_theta_full        29.00
_diffrn_reflns_theta_max         29.00
_diffrn_reflns_theta_min         2.45
_exptl_absorpt_coefficient_mu    3.063
_exptl_absorpt_correction_T_max  0.7917
_exptl_absorpt_correction_T_min  0.4224
_exptl_crystal_colour            light-brown
_exptl_crystal_density_diffrn    1.632
_exptl_crystal_density_method    'not measured'
_exptl_crystal_description       block
_exptl_crystal_F_000             912
_exptl_crystal_size_max          0.34
_exptl_crystal_size_mid          0.28
_exptl_crystal_size_min          0.08
_refine_diff_density_max         0.408
_refine_diff_density_min         -0.357
_refine_diff_density_rms         0.060
_refine_ls_extinction_method     none
_refine_ls_goodness_of_fit_ref   1.029
_refine_ls_hydrogen_treatment    mixed
_refine_ls_matrix_type           full
_refine_ls_number_parameters     150
_refine_ls_number_reflns         2568
_refine_ls_number_restraints     0
_refine_ls_restrained_S_all      1.029
_refine_ls_R_factor_all          0.0228
_refine_ls_R_factor_gt           0.0176
_refine_ls_shift/su_max          0.002
_refine_ls_shift/su_mean         0.000
_refine_ls_structure_factor_coef Fsqd
_refine_ls_weighting_details
'calc w=1/[\s^2^(Fo^2^)+(0.0201P)^2^+0.4830P] where P=(Fo^2^+2Fc^2^)/3'
_refine_ls_weighting_scheme      calc
_refine_ls_wR_factor_gt          0.0404
_refine_ls_wR_factor_ref         0.0419
_reflns_number_gt                2283
_reflns_number_total             2568
_reflns_threshold_expression     >2sigma(I)
_cod_data_source_file            ic061314bsi20060716_084620_09.cif
_cod_data_source_block           9
_cod_database_code               4306963