New Self-Activating Organochromium Catalyst Precursor for Selective Ethylene Trimerization.
Albahily, Khalid; Fomitcheva, Valeria; Shaikh, Yacoob; Sebastiao, Elena; Gorelsky, Serge I.; Gambarotta, Sandro; Korobkov, Ilia; Duchateau, Robbert; Organometallics 30 (2011) 4201–; doi:10.1021/om200560e

data_4065095
_publ_section_title
;
 New Self-Activating Organochromium Catalyst Precursor for Selective
 Ethylene Trimerization.
;
_journal_issue                   15
_journal_name_full               Organometallics
_journal_page_first              4201
_journal_paper_doi               10.1021/om200560e
_journal_volume                  30
_journal_year                    2011
_chemical_formula_sum            'C32 H72 Cr2 Li2 N4 O3 P2'
_chemical_formula_weight         740.76
_chemical_name_systematic
; 
 ? 
;
_space_group_IT_number           14
_symmetry_cell_setting           monoclinic
_symmetry_space_group_name_Hall  '-P 2yn'
_symmetry_space_group_name_H-M   'P 1 21/n 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                 90.297(7)
_cell_angle_gamma                90.00
_cell_formula_units_Z            4
_cell_length_a                   11.003(6)
_cell_length_b                   16.789(9)
_cell_length_c                   22.718(12)
_cell_measurement_reflns_used    7827
_cell_measurement_temperature    201(2)
_cell_measurement_theta_max      26.38
_cell_measurement_theta_min      2.22
_cell_volume                     4197(4)
_computing_cell_refinement       'Bruker SMART'
_computing_data_collection       'Bruker SMART'
_computing_data_reduction        'Bruker SAINT'
_computing_molecular_graphics    'Bruker SHELXTL'
_computing_publication_material  'Bruker SHELXTL'
_computing_structure_refinement  'SHELXL-97 (Sheldrick, 1997)'
_computing_structure_solution    'SHELXS-97 (Sheldrick, 1990)'
_diffrn_ambient_temperature      201(2)
_diffrn_measured_fraction_theta_full 0.992
_diffrn_measured_fraction_theta_max 0.992
_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
_diffrn_radiation_wavelength     0.71073
_diffrn_reflns_av_R_equivalents  0.0547
_diffrn_reflns_av_sigmaI/netI    0.0535
_diffrn_reflns_limit_h_max       13
_diffrn_reflns_limit_h_min       -13
_diffrn_reflns_limit_k_max       20
_diffrn_reflns_limit_k_min       -19
_diffrn_reflns_limit_l_max       27
_diffrn_reflns_limit_l_min       -27
_diffrn_reflns_number            26322
_diffrn_reflns_theta_full        25.35
_diffrn_reflns_theta_max         25.35
_diffrn_reflns_theta_min         2.05
_exptl_absorpt_coefficient_mu    0.627
_exptl_absorpt_correction_T_max  0.9119
_exptl_absorpt_correction_T_min  0.8591
_exptl_absorpt_correction_type   multi-scan
_exptl_absorpt_process_details   SADABS
_exptl_crystal_colour            brown
_exptl_crystal_density_diffrn    1.172
_exptl_crystal_density_meas      ?
_exptl_crystal_density_method    'not measured'
_exptl_crystal_description       block
_exptl_crystal_F_000             1600
_exptl_crystal_size_max          0.25
_exptl_crystal_size_mid          0.20
_exptl_crystal_size_min          0.15
_refine_diff_density_max         0.690
_refine_diff_density_min         -0.533
_refine_diff_density_rms         0.091
_refine_ls_extinction_method     none
_refine_ls_goodness_of_fit_ref   1.076
_refine_ls_hydrogen_treatment    constr
_refine_ls_matrix_type           full
_refine_ls_number_parameters     454
_refine_ls_number_reflns         7635
_refine_ls_number_restraints     134
_refine_ls_restrained_S_all      1.072
_refine_ls_R_factor_all          0.0909
_refine_ls_R_factor_gt           0.0672
_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^)+(0.0823P)^2^+7.7253P] where P=(Fo^2^+2Fc^2^)/3'
_refine_ls_weighting_scheme      calc
_refine_ls_wR_factor_gt          0.1741
_refine_ls_wR_factor_ref         0.1876
_reflns_number_gt                5586
_reflns_number_total             7635
_reflns_threshold_expression     >2sigma(I)
_cod_data_source_file            om200560e_si_002.cif
_cod_data_source_block           sad
_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 'n/a' 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_cell_volume        4196(4)
_cod_original_sg_symbol_H-M      P2(1)/n
_cod_database_code               4065095