Synthesis and Reactivity of a Sterically Crowded Tris(pyrazolyl)borate Hafnium Benzyl Complex
Lee, Han; Nienkemper, Katrin; Jordan, Richard F.; Organometallics 27 (2008) 5075–; doi:10.1021/om8005799

data_4072092
_publ_section_title
;
 Synthesis and Reactivity of a Sterically Crowded Tris(pyrazolyl)borate
 Hafnium Benzyl Complex
;
_journal_issue                   19
_journal_name_full               Organometallics
_journal_page_first              5075
_journal_paper_doi               10.1021/om8005799
_journal_volume                  27
_journal_year                    2008
_chemical_formula_sum            'C57 H61 B Hf N6'
_chemical_formula_weight         1019.42
_chemical_name_systematic
; 
 ? 
;
_space_group_IT_number           152
_symmetry_space_group_name_Hall  'P 31 2"'
_symmetry_space_group_name_H-M   'P 31 2 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                 90.00
_cell_angle_gamma                120.00
_cell_formula_units_Z            6
_cell_length_a                   20.872(3)
_cell_length_b                   20.872(3)
_cell_length_c                   21.022(4)
_cell_measurement_reflns_used    1024
_cell_measurement_temperature    100(2)
_cell_measurement_theta_max      25.03
_cell_measurement_theta_min      1.49
_cell_volume                     7931(2)
_computing_structure_refinement  'SHELXL-97 (Sheldrick, 1997)'
_computing_structure_solution    'SHELXS-97 (Sheldrick, 1990)'
_diffrn_ambient_temperature      100(2)
_diffrn_measured_fraction_theta_full 1.000
_diffrn_measured_fraction_theta_max 1.000
_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  0.0477
_diffrn_reflns_av_sigmaI/netI    0.0287
_diffrn_reflns_limit_h_max       24
_diffrn_reflns_limit_h_min       -24
_diffrn_reflns_limit_k_max       24
_diffrn_reflns_limit_k_min       -24
_diffrn_reflns_limit_l_max       24
_diffrn_reflns_limit_l_min       -24
_diffrn_reflns_number            77657
_diffrn_reflns_theta_full        25.03
_diffrn_reflns_theta_max         25.03
_diffrn_reflns_theta_min         1.49
_exptl_absorpt_coefficient_mu    2.014
_exptl_absorpt_correction_T_max  0.7941
_exptl_absorpt_correction_T_min  0.7259
_exptl_absorpt_correction_type   multi-scan
_exptl_absorpt_process_details
;
absorption corrections were made based on correspondance of
equivalent intensities usingprogram SADABS (G. Sheldrick, Bruker 
Analytical X-ray Systems, Madison, WI)
;
_exptl_crystal_density_diffrn    1.281
_exptl_crystal_density_method    'not measured'
_exptl_crystal_F_000             3132
_exptl_crystal_size_max          0.17
_exptl_crystal_size_mid          0.12
_exptl_crystal_size_min          0.12
_refine_diff_density_max         1.324
_refine_diff_density_min         -1.292
_refine_diff_density_rms         0.090
_refine_ls_abs_structure_details 'Flack H D (1983), Acta Cryst. A39, 876-881'
_refine_ls_abs_structure_Flack   0.022(7)
_refine_ls_extinction_method     none
_refine_ls_goodness_of_fit_ref   1.092
_refine_ls_hydrogen_treatment    mixed
_refine_ls_matrix_type           full
_refine_ls_number_parameters     599
_refine_ls_number_reflns         9357
_refine_ls_number_restraints     0
_refine_ls_restrained_S_all      1.092
_refine_ls_R_factor_all          0.0330
_refine_ls_R_factor_gt           0.0314
_refine_ls_shift/su_max          0.012
_refine_ls_shift/su_mean         0.000
_refine_ls_structure_factor_coef Fsqd
_refine_ls_weighting_details
'calc w=1/[\s^2^(Fo^2^)+(0.0492P)^2^+1.0523P] where P=(Fo^2^+2Fc^2^)/3'
_refine_ls_weighting_scheme      calc
_refine_ls_wR_factor_gt          0.0808
_refine_ls_wR_factor_ref         0.0816
_reflns_number_gt                9049
_reflns_number_total             9357
_reflns_threshold_expression     >2sigma(I)
_cod_data_source_file            om8005799_si_001.cif
_cod_data_source_block           hanle10x
_cod_original_sg_symbol_H-M      P3121
_cod_database_code               4072092