Niobocene hydrides with functionalised silyl ligands. Tuning of interligand hypervalent interactions (IHI) M‒H →Si‒X
Nikonov, Georgii I.; Kuzmina, Lyudmila G.; Howard, Judith A. K.; Journal of the Chemical Society, Dalton Transactions  (2002) 3037–; doi:10.1039/b110998g

data_7011354
_publ_section_title
;
 Niobocene hydrides with functionalised silyl ligands. Tuning of
 interligand hypervalent interactions (IHI) M--H \\rightarrow Si--X
;
_journal_issue                   15
_journal_name_full
'Journal of the Chemical Society, Dalton Transactions'
_journal_page_first              3037
_journal_paper_doi               10.1039/b110998g
_journal_year                    2002
_chemical_formula_moiety         Cp2Nb(SiMe2OMe)2H
_chemical_formula_sum            'C16 H29 Nb O2 Si2'
_chemical_formula_weight         402.48
_chemical_name_common
;
bis(dimethylmethoxysilyl)niobocen monohydride
;
_chemical_name_systematic
; 
bis(cyclopentadienyl)bis(dimethylmethoxysilyl)hydride niobium(V) 
;
_space_group_IT_number           2
_symmetry_cell_setting           triclinic
_symmetry_space_group_name_Hall  '-P 1'
_symmetry_space_group_name_H-M   'P -1'
_atom_sites_solution_hydrogens   geom
_atom_sites_solution_primary     direct
_atom_sites_solution_secondary   difmap
_audit_creation_method           SHELXL
_cell_angle_alpha                70.1000(10)
_cell_angle_beta                 72.7390(10)
_cell_angle_gamma                73.9360(10)
_cell_formula_units_Z            2
_cell_length_a                   7.77290(10)
_cell_length_b                   10.5018(2)
_cell_length_c                   13.0324(2)
_cell_measurement_temperature    153(2)
_cell_volume                     936.79(3)
_computing_structure_refinement  'SHELXL-93 (Sheldrick, 1993)'
_computing_structure_solution    'SHELXS-86 (Sheldrick, 1990)'
_diffrn_ambient_temperature      153(2)
_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  0.0454
_diffrn_reflns_av_sigmaI/netI    0.0431
_diffrn_reflns_limit_h_max       9
_diffrn_reflns_limit_h_min       -10
_diffrn_reflns_limit_k_max       13
_diffrn_reflns_limit_k_min       -12
_diffrn_reflns_limit_l_max       16
_diffrn_reflns_limit_l_min       -16
_diffrn_reflns_number            6066
_diffrn_reflns_theta_max         25.99
_diffrn_reflns_theta_min         1.71
_exptl_absorpt_coefficient_mu    0.772
_exptl_absorpt_correction_type   none
_exptl_crystal_density_diffrn    1.427
_exptl_crystal_F_000             420
_exptl_crystal_size_max          0.66
_exptl_crystal_size_mid          0.18
_exptl_crystal_size_min          0.08
_refine_diff_density_max         0.550
_refine_diff_density_min         -0.858
_refine_diff_density_rms         0.104
_refine_ls_extinction_coef       0.0041(11)
_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_all   1.109
_refine_ls_goodness_of_fit_obs   1.111
_refine_ls_matrix_type           full
_refine_ls_number_parameters     307
_refine_ls_number_reflns         3496
_refine_ls_number_restraints     0
_refine_ls_restrained_S_all      1.193
_refine_ls_restrained_S_obs      1.111
_refine_ls_R_factor_all          0.0442
_refine_ls_R_factor_obs          0.0361
_refine_ls_shift/esd_max         0.001
_refine_ls_shift/esd_mean        0.000
_refine_ls_structure_factor_coef Fsqd
_refine_ls_weighting_details
'w=1/[\s^2^(Fo^2^)+(0.0344P)^2^+1.7843P] where P=(Fo^2^+2Fc^2^)/3'
_refine_ls_weighting_scheme      calc
_refine_ls_wR_factor_all         0.0959
_refine_ls_wR_factor_obs         0.0843
_reflns_number_observed          3287
_reflns_number_total             3648
_reflns_observed_criterion       >2sigma(I)
_cod_data_source_file            b110998g.txt
_cod_data_source_block           compound24
_cod_depositor_comments
;
The following automatic conversions were performed:

'_refine_ls_weighting_scheme' value 'calc
w=1/[\s^2^(Fo^2^)+(0.0344P)^2^+1.7843P] where P=(Fo^2^+2Fc^2^)/3' was
changed to 'calc'. New tag '_refine_ls_weighting_details' was
created. The value of the new tag was set to
'w=1/[\s^2^(Fo^2^)+(0.0344P)^2^+1.7843P] where P=(Fo^2^+2Fc^2^)/3'.

Automatic conversion script
Id: cif_fix_values 3143 2015-03-26 13:38:13Z robertas 
;
_cod_original_sg_symbol_H-M      P-1
_cod_database_code               7011354