Chromium Complexes with Me2Si-Bridged Cyclopentadienyl-imidazolin-2-imine Ligands: Synthesis, Structure, and Use in Ethylene Polymerization Catalysis
Randoll, Sören; Jones, Peter G.; Tamm, Matthias; Organometallics 27 (2008) 3232–; doi:10.1021/om800145z

data_4071395
_publ_section_title
;
 Chromium Complexes with Me2Si-Bridged Cyclopentadienyl-imidazolin-2-imine
 Ligands: Synthesis, Structure, and Use in Ethylene Polymerization
 Catalysis
;
_journal_issue                   13
_journal_name_full               Organometallics
_journal_page_first              3232
_journal_paper_doi               10.1021/om800145z
_journal_volume                  27
_journal_year                    2008
_chemical_formula_sum            'C22 H38 Cl2 Cr N3 Si'
_chemical_formula_weight         495.54
_chemical_name_systematic
; 
 ? 
;
_space_group_IT_number           14
_symmetry_cell_setting           monoclinic
_symmetry_space_group_name_Hall  '-P 2ybc'
_symmetry_space_group_name_H-M   'P 1 21/c 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                 96.069(3)
_cell_angle_gamma                90.00
_cell_formula_units_Z            4
_cell_length_a                   17.1117(18)
_cell_length_b                   8.9247(10)
_cell_length_c                   16.6329(18)
_cell_measurement_reflns_used    6972
_cell_measurement_temperature    133(2)
_cell_measurement_theta_max      30.50
_cell_measurement_theta_min      2.46
_cell_volume                     2525.9(5)
_computing_cell_refinement       'Bruker SAINT'
_computing_data_collection       'Bruker SMART'
_computing_data_reduction        'Bruker SAINT'
_computing_molecular_graphics    'Siemens XP'
_computing_publication_material  SHELXL-97
_computing_structure_refinement  'SHELXL-97 (Sheldrick, 1997)'
_computing_structure_solution    'SHELXS-97 (Sheldrick, 1990)'
_diffrn_ambient_temperature      133(2)
_diffrn_detector_area_resol_mean 8.192
_diffrn_measured_fraction_theta_full 0.999
_diffrn_measured_fraction_theta_max 0.999
_diffrn_measurement_device_type  'Bruker SMART 1000 CCD'
_diffrn_measurement_method       '\w- & \f-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  0.0288
_diffrn_reflns_av_sigmaI/netI    0.0214
_diffrn_reflns_limit_h_max       24
_diffrn_reflns_limit_h_min       -24
_diffrn_reflns_limit_k_max       12
_diffrn_reflns_limit_k_min       -12
_diffrn_reflns_limit_l_max       23
_diffrn_reflns_limit_l_min       -23
_diffrn_reflns_number            50767
_diffrn_reflns_theta_full        30.00
_diffrn_reflns_theta_max         30.53
_diffrn_reflns_theta_min         1.20
_exptl_absorpt_coefficient_mu    0.726
_exptl_absorpt_correction_T_max  0.8394
_exptl_absorpt_correction_T_min  0.7538
_exptl_absorpt_correction_type   multi-scan
_exptl_absorpt_process_details   SADABS
_exptl_crystal_colour            blue
_exptl_crystal_density_diffrn    1.303
_exptl_crystal_density_meas      ?
_exptl_crystal_density_method    'not measured'
_exptl_crystal_description       Fragment
_exptl_crystal_F_000             1052
_exptl_crystal_size_max          0.48
_exptl_crystal_size_mid          0.37
_exptl_crystal_size_min          0.25
_refine_diff_density_max         0.480
_refine_diff_density_min         -0.285
_refine_diff_density_rms         0.063
_refine_ls_extinction_method     none
_refine_ls_goodness_of_fit_ref   1.050
_refine_ls_hydrogen_treatment    'rigid methyls, others riding'
_refine_ls_matrix_type           full
_refine_ls_number_parameters     274
_refine_ls_number_reflns         7710
_refine_ls_number_restraints     0
_refine_ls_restrained_S_all      1.050
_refine_ls_R_factor_all          0.0424
_refine_ls_R_factor_gt           0.0298
_refine_ls_shift/su_max          0.003
_refine_ls_shift/su_mean         0.000
_refine_ls_structure_factor_coef Fsqd
_refine_ls_weighting_details
'calc w=1/[\s^2^(Fo^2^)+(0.0367P)^2^+1.3004P] where P=(Fo^2^+2Fc^2^)/3'
_refine_ls_weighting_scheme      calc
_refine_ls_wR_factor_gt          0.0728
_refine_ls_wR_factor_ref         0.0803
_reflns_number_gt                6315
_reflns_number_total             7710
_reflns_threshold_expression     >2sigma(I)
_cod_data_source_file            om800145z-file001.cif
_cod_data_source_block           sran13d
_cod_depositor_comments
;
The following automatic conversions were performed:

'_symmetry_cell_setting' value 'Monoclinic' changed to 'monoclinic'
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_values 1715 2011-07-08 13:25:40Z adriana 

The following automatic conversions were performed:

'_exptl_crystal_density_meas' value 'not measured' was changed to '?'
- the value is perceived as not measured.

Automatic conversion script
Id: cif_fix_values 3008 2015-01-20 13:52:24Z robertas 
;
_cod_original_sg_symbol_H-M      'P 21/c'
_cod_database_code               4071395