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_4071394
_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            'C18 H30 Cl2 Cr N3 Si'
_chemical_formula_weight         439.44
_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                 93.670(3)
_cell_angle_gamma                90.00
_cell_formula_units_Z            4
_cell_length_a                   11.2546(12)
_cell_length_b                   12.3589(14)
_cell_length_c                   15.0347(16)
_cell_measurement_reflns_used    8222
_cell_measurement_temperature    133(2)
_cell_measurement_theta_max      29.36
_cell_measurement_theta_min      2.72
_cell_volume                     2087.0(4)
_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  0.0505
_diffrn_reflns_av_sigmaI/netI    0.0351
_diffrn_reflns_limit_h_max       14
_diffrn_reflns_limit_h_min       -15
_diffrn_reflns_limit_k_max       16
_diffrn_reflns_limit_k_min       -16
_diffrn_reflns_limit_l_max       20
_diffrn_reflns_limit_l_min       -20
_diffrn_reflns_number            37221
_diffrn_reflns_theta_full        28.00
_diffrn_reflns_theta_max         28.28
_diffrn_reflns_theta_min         1.81
_exptl_absorpt_coefficient_mu    0.868
_exptl_absorpt_correction_T_max  0.9259
_exptl_absorpt_correction_T_min  0.7860
_exptl_absorpt_correction_type   multi-scan
_exptl_absorpt_process_details   SADABS
_exptl_crystal_colour            blue
_exptl_crystal_density_diffrn    1.399
_exptl_crystal_density_meas      ?
_exptl_crystal_density_method    'not measured'
_exptl_crystal_description       Tablet
_exptl_crystal_F_000             924
_exptl_crystal_size_max          0.29
_exptl_crystal_size_mid          0.23
_exptl_crystal_size_min          0.09
_refine_diff_density_max         0.622
_refine_diff_density_min         -0.423
_refine_diff_density_rms         0.104
_refine_ls_extinction_method     none
_refine_ls_goodness_of_fit_ref   1.090
_refine_ls_hydrogen_treatment    'rigid methyls'
_refine_ls_matrix_type           full
_refine_ls_number_parameters     236
_refine_ls_number_reflns         5173
_refine_ls_number_restraints     0
_refine_ls_restrained_S_all      1.090
_refine_ls_R_factor_all          0.0676
_refine_ls_R_factor_gt           0.0437
_refine_ls_shift/su_max          0.000
_refine_ls_shift/su_mean         0.000
_refine_ls_structure_factor_coef Fsqd
_refine_ls_weighting_details
'calc w=1/[\s^2^(Fo^2^)+(0.0443P)^2^+3.6929P] where P=(Fo^2^+2Fc^2^)/3'
_refine_ls_weighting_scheme      calc
_refine_ls_wR_factor_gt          0.1033
_refine_ls_wR_factor_ref         0.1156
_reflns_number_gt                3895
_reflns_number_total             5173
_reflns_threshold_expression     >2sigma(I)
_cod_data_source_file            om800145z-file001.cif
_cod_data_source_block           sran17a
_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               4071394