Zirconium, Hafnium, and Tantalum Amide Silyl Complexes: Their Preparation and Conversion to Metallaheterocyclic Complexes via γ-Hydrogen Abstraction by Silyl Ligands
Xianghua Yu; Siwei Bi; Ilia A. Guzei; Zhenyang Lin; Zi-Ling Xue; Inorganic Chemistry 43 (2004) 7111–7119; doi:10.1021/ic049023v

data_4311879
_publ_section_title
;
 Zirconium, Hafnium, and Tantalum Amide Silyl Complexes: Their Preparation
 and Conversion to Metallaheterocyclic Complexes via \g-Hydrogen
 Abstraction by Silyl Ligands
;
_journal_name_full               'Inorganic Chemistry'
_journal_page_first              7111
_journal_page_last               7119
_journal_paper_doi               10.1021/ic049023v
_journal_volume                  43
_journal_year                    2004
_chemical_formula_sum            'C28 H82 Hf2 N6 Si8'
_chemical_formula_weight         1084.67
_chemical_name_systematic
; 
Hafnium amide cyclic complex
;
_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-97
_cell_angle_alpha                105.330(6)
_cell_angle_beta                 99.331(6)
_cell_angle_gamma                105.157(6)
_cell_formula_units_Z            2
_cell_length_a                   10.151(4)
_cell_length_b                   14.368(5)
_cell_length_c                   18.921(7)
_cell_measurement_temperature    173(2)
_cell_volume                     2488.3(16)
_computing_cell_refinement       'SMART, Bruker (2000)'
_computing_data_collection       'SMART, Bruker (2000)'
_computing_data_reduction        'XPREP, Bruker (2000)'
_computing_molecular_graphics    'SHELXTL, Bruker (2000)'
_computing_publication_material  'SHELXTL, Bruker (2000)'
_computing_structure_refinement  'SHELXL-97 (Sheldrick, 1997)'
_computing_structure_solution    'SHELXS-97 (Sheldrick, 1990)'
_diffrn_ambient_temperature      173(2)
_diffrn_measured_fraction_theta_full 0.993
_diffrn_measured_fraction_theta_max 0.993
_diffrn_measurement_device_type  'CCD area detector'
_diffrn_measurement_method       multi-scan
_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  0.0510
_diffrn_reflns_av_sigmaI/netI    0.0694
_diffrn_reflns_limit_h_max       10
_diffrn_reflns_limit_h_min       -10
_diffrn_reflns_limit_k_max       15
_diffrn_reflns_limit_k_min       -15
_diffrn_reflns_limit_l_max       20
_diffrn_reflns_limit_l_min       -20
_diffrn_reflns_number            17207
_diffrn_reflns_theta_full        22.55
_diffrn_reflns_theta_max         22.55
_diffrn_reflns_theta_min         1.61
_exptl_absorpt_coefficient_mu    4.386
_exptl_absorpt_correction_T_max  0.1492
_exptl_absorpt_correction_T_min  0.1101
_exptl_absorpt_correction_type   multi-scan
_exptl_absorpt_process_details   'SADABS, Bruker (2000)'
_exptl_crystal_colour            colorless
_exptl_crystal_density_diffrn    1.448
_exptl_crystal_density_method    'not measured'
_exptl_crystal_description       fragment
_exptl_crystal_F_000             1096
_exptl_crystal_size_max          0.90
_exptl_crystal_size_mid          0.80
_exptl_crystal_size_min          0.70
_refine_diff_density_max         1.513
_refine_diff_density_min         -1.687
_refine_diff_density_rms         0.133
_refine_ls_extinction_method     none
_refine_ls_goodness_of_fit_ref   0.848
_refine_ls_hydrogen_treatment    mixed
_refine_ls_matrix_type           full
_refine_ls_number_parameters     423
_refine_ls_number_reflns         6503
_refine_ls_number_restraints     0
_refine_ls_restrained_S_all      0.848
_refine_ls_R_factor_all          0.0508
_refine_ls_R_factor_gt           0.0331
_refine_ls_shift/su_max          0.433
_refine_ls_shift/su_mean         0.009
_refine_ls_structure_factor_coef Fsqd
_refine_ls_weighting_details
'calc w=1/[\s^2^(Fo^2^)+(0.0463P)^2^+11.1190P] where P=(Fo^2^+2Fc^2^)/3'
_refine_ls_weighting_scheme      calc
_refine_ls_wR_factor_gt          0.0789
_refine_ls_wR_factor_ref         0.0921
_reflns_number_gt                5135
_reflns_number_total             6503
_reflns_threshold_expression     >2sigma(I)
_cod_data_source_file            ic049023vrom20040721_122032.cif
_cod_data_source_block           hf45
_cod_depositor_comments
;
The following automatic conversions were performed:
'_symmetry_cell_setting' value 'Triclinic' changed to 'triclinic'
according to '/home/saulius/struct/CIF-dictionaries/cif_core.dic'
dictionary named 'cif_core.dic' version 2.4.1 from 2010-06-29.

Automatic conversion script
Id: cif_fix_enum 1527 2010-12-29 10:47:43Z saulius 
;
_cod_original_cell_volume        2488.2(16)
_cod_database_code               4311879