Reactivity of Chromium Complexes of a Bis(imino)pyridine Ligand: Highly Active Ethylene Polymerization Catalysts Carrying the Metal in a Formally Low Oxidation State
Vidyaratne, Indu; Scott, Jennifer; Gambarotta, Sandro; Duchateau, Robbert; Organometallics 26 (2007) 3201–; doi:10.1021/om0701423

data_4073179
_publ_section_title
;
 Reactivity of Chromium Complexes of a Bis(imino)pyridine Ligand:&#x00A0;
 Highly Active Ethylene Polymerization Catalysts Carrying the Metal in a
 Formally Low Oxidation State
;
_journal_issue                   13
_journal_name_full               Organometallics
_journal_page_first              3201
_journal_paper_doi               10.1021/om0701423
_journal_volume                  26
_journal_year                    2007
_chemical_formula_sum            'C47 H73 Cr Li N3 O3'
_chemical_formula_weight         787.02
_chemical_name_systematic
; 
 ? 
;
_space_group_IT_number           33
_symmetry_cell_setting           orthorhombic
_symmetry_space_group_name_Hall  'P 2c -2n'
_symmetry_space_group_name_H-M   'P n a 21'
_atom_sites_solution_hydrogens   geom
_atom_sites_solution_primary     direct
_atom_sites_solution_secondary   difmap
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_cell_angle_alpha                90.00
_cell_angle_beta                 90.00
_cell_angle_gamma                90.00
_cell_formula_units_Z            4
_cell_length_a                   28.334(12)
_cell_length_b                   12.367(5)
_cell_length_c                   13.407(6)
_cell_measurement_reflns_used    704
_cell_measurement_temperature    208(2)
_cell_measurement_theta_max      18.34
_cell_measurement_theta_min      2.16
_cell_volume                     4698(3)
_computing_cell_refinement       'SMART, Bruker (2000)'
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_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      208(2)
_diffrn_measured_fraction_theta_full 0.985
_diffrn_measured_fraction_theta_max 0.985
_diffrn_measurement_device_type  'CCD area detector'
_diffrn_measurement_method       'phi and omega scans'
_diffrn_radiation_monochromator  graphite
_diffrn_radiation_source         'fine-focus sealed tube'
_diffrn_radiation_type           MoK\a
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_diffrn_reflns_av_R_equivalents  0.1885
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_diffrn_reflns_limit_k_min       -12
_diffrn_reflns_limit_l_max       13
_diffrn_reflns_limit_l_min       -13
_diffrn_reflns_number            21619
_diffrn_reflns_theta_full        20.85
_diffrn_reflns_theta_max         20.85
_diffrn_reflns_theta_min         2.35
_diffrn_standards_decay_%        <1
_exptl_absorpt_coefficient_mu    0.283
_exptl_absorpt_correction_T_max  0.9860
_exptl_absorpt_correction_T_min  0.9588
_exptl_absorpt_correction_type   multi-scan
_exptl_absorpt_process_details   'SADABS, Bruker (2000)'
_exptl_crystal_colour            dk_brown
_exptl_crystal_density_diffrn    1.113
_exptl_crystal_density_meas      0
_exptl_crystal_density_method    'not measured'
_exptl_crystal_description       block
_exptl_crystal_F_000             1708
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_refine_diff_density_max         0.345
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_refine_ls_abs_structure_Flack   0.01(4)
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_refine_ls_number_parameters     496
_refine_ls_number_reflns         4764
_refine_ls_number_restraints     104
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_refine_ls_R_factor_all          0.1481
_refine_ls_R_factor_gt           0.0762
_refine_ls_shift/su_max          0.001
_refine_ls_shift/su_mean         0.001
_refine_ls_structure_factor_coef Fsqd
_refine_ls_weighting_details     'calc w=1/[\s^2^(Fo^2^)+(0.0436P)^2^]'
_refine_ls_weighting_scheme      calc
_refine_ls_wR_factor_gt          0.1130
_refine_ls_wR_factor_ref         0.1334
_reflns_number_gt                2754
_reflns_number_total             4764
_reflns_threshold_expression     >2sigma(I)
_cod_data_source_file            om0701423-file001.cif
_cod_data_source_block           sg2708a
_cod_depositor_comments
;
The following automatic conversions were performed:

'_symmetry_cell_setting' value 'Orthorhombic' changed to
'orthorhombic' 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 
;
_cod_original_sg_symbol_H-M      Pna2(1)
_cod_database_code               4073179