A well-defined model system for the chromium-catalyzed selective oligomerization of ethylene.
Monillas, Wesley H.; Young, John F.; Yap, Glenn P. A.; Theopold, Klaus H.; Dalton transactions (Cambridge, England : 2003) 42 (2013) 9198–9210; doi:10.1039/c3dt00109a

data_7022584
_publ_section_title
;
 A well-defined model system for the chromium-catalyzed selective
 oligomerization of ethylene.
;
_journal_issue                   25
_journal_name_full
'Dalton transactions (Cambridge, England : 2003)'
_journal_page_first              9198
_journal_page_last               9210
_journal_paper_doi               10.1039/c3dt00109a
_journal_volume                  42
_journal_year                    2013
_chemical_formula_sum            'C68 H108 Cr2 N4 O Si2'
_chemical_formula_weight         1157.76
_space_group_IT_number           4
_symmetry_cell_setting           monoclinic
_symmetry_space_group_name_Hall  'P 2yb'
_symmetry_space_group_name_H-M   'P 1 21 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                 109.268(7)
_cell_angle_gamma                90.00
_cell_formula_units_Z            2
_cell_length_a                   13.404(5)
_cell_length_b                   14.089(5)
_cell_length_c                   18.924(7)
_cell_measurement_reflns_used    712
_cell_measurement_temperature    120(2)
_cell_measurement_theta_max      17.84
_cell_measurement_theta_min      2.32
_cell_volume                     3374(2)
_computing_cell_refinement       'SAINT (Bruker, 2002)'
_computing_data_collection       'SMART (Bruker, 2002)'
_computing_data_reduction        SAINT
_computing_molecular_graphics    'SHELXTL (Sheldrick, 2001)'
_computing_publication_material  'SHELXTL (Sheldrick, 2001)'
_computing_structure_refinement  'SHELXL-97 (Sheldrick, 1997)'
_computing_structure_solution    'SHELXS-97 (Sheldrick, 1990)'
_diffrn_ambient_temperature      120(2)
_diffrn_detector_area_resol_mean 836.6
_diffrn_measured_fraction_theta_full 1.000
_diffrn_measured_fraction_theta_max 1.000
_diffrn_measurement_device_type  'Bruker AXS APEX diffractometer'
_diffrn_measurement_method       \w
_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  0.0872
_diffrn_reflns_av_sigmaI/netI    0.1457
_diffrn_reflns_limit_h_max       15
_diffrn_reflns_limit_h_min       -15
_diffrn_reflns_limit_k_max       16
_diffrn_reflns_limit_k_min       -16
_diffrn_reflns_limit_l_max       22
_diffrn_reflns_limit_l_min       -22
_diffrn_reflns_number            26696
_diffrn_reflns_theta_full        25.00
_diffrn_reflns_theta_max         25.00
_diffrn_reflns_theta_min         1.61
_diffrn_standards_decay_%        1
_diffrn_standards_interval_count 0
_diffrn_standards_interval_time  0
_diffrn_standards_number         0
_exptl_absorpt_coefficient_mu    0.400
_exptl_absorpt_correction_T_max  0.9760
_exptl_absorpt_correction_T_min  0.9330
_exptl_absorpt_correction_type   multi-scan
_exptl_absorpt_process_details   'SADABS (Sheldrick, 2003)'
_exptl_crystal_colour            brown
_exptl_crystal_density_diffrn    1.140
_exptl_crystal_density_method    'not measured'
_exptl_crystal_description       block
_exptl_crystal_F_000             1256
_exptl_crystal_size_max          0.18
_exptl_crystal_size_mid          0.11
_exptl_crystal_size_min          0.06
_refine_diff_density_max         0.496
_refine_diff_density_min         -0.279
_refine_diff_density_rms         0.065
_refine_ls_abs_structure_details
'Flack H D (1983), Acta Cryst. A39, 876-881; 5540 Friedel pairs'
_refine_ls_abs_structure_Flack   0.03(3)
_refine_ls_extinction_method     none
_refine_ls_goodness_of_fit_ref   1.025
_refine_ls_hydrogen_treatment    mixed
_refine_ls_matrix_type           full
_refine_ls_number_parameters     732
_refine_ls_number_reflns         11746
_refine_ls_number_restraints     3
_refine_ls_restrained_S_all      1.025
_refine_ls_R_factor_all          0.1285
_refine_ls_R_factor_gt           0.0745
_refine_ls_shift/su_max          0.010
_refine_ls_shift/su_mean         0.002
_refine_ls_structure_factor_coef Fsqd
_refine_ls_weighting_details
'calc w=1/[\s^2^(Fo^2^)+(0.0467P)^2] where P=(Fo^2^+2Fc^2^)/3'
_refine_ls_weighting_scheme      calc
_refine_ls_wR_factor_gt          0.1277
_refine_ls_wR_factor_ref         0.1533
_reflns_number_gt                7471
_reflns_number_total             11746
_reflns_threshold_expression     >2sigma(I)
_cod_data_source_file            c3dt00109a.txt
_cod_data_source_block           klat305
_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 2.4.2 from 2011-04-26.

Automatic conversion script
Id: cif_fix_values 1891 2012-01-12 08:04:46Z andrius 
;
_cod_original_sg_symbol_H-M      P2(1)
_cod_database_code               7022584