Ethylene oligomerisation chromium catalysts with unsymmetrical PCNP ligands.
Blann, Kevin; Bollmann, Annette; Brown, Gavin M.; Dixon, John T.; Elsegood, Mark R. J.; Raw, Christopher R.; Smith, Martin B.; Tenza, Kenny; Willemse, J. Alexander; Zweni, Pumza; Dalton transactions (Cambridge, England : 2003) 50 (2021) 4345–4354; doi:10.1039/d1dt00287b

data_7706825
_publ_section_title
;
 Ethylene oligomerisation chromium catalysts with unsymmetrical PCNP
 ligands.
;
_journal_issue                   12
_journal_name_full
'Dalton transactions (Cambridge, England : 2003)'
_journal_page_first              4345
_journal_page_last               4354
_journal_paper_doi               10.1039/d1dt00287b
_journal_volume                  50
_journal_year                    2021
_chemical_formula_moiety         'C38 H27 Cr N O4 P2'
_chemical_formula_sum            'C38 H27 Cr N O4 P2'
_chemical_formula_weight         675.54
_space_group_crystal_system      monoclinic
_space_group_IT_number           14
_space_group_name_Hall           '-P 2yn'
_space_group_name_H-M_alt        'P 1 21/n 1'
_atom_sites_solution_hydrogens   geom
_atom_sites_solution_primary     heavy
_atom_sites_solution_secondary   difmap
_audit_creation_method           SHELXL-2018/3
_audit_update_record
;
2020-07-21 deposited with the CCDC.	2021-03-03 downloaded from the CCDC.
;
_cell_angle_alpha                90
_cell_angle_beta                 101.0381(4)
_cell_angle_gamma                90
_cell_formula_units_Z            4
_cell_length_a                   12.1106(4)
_cell_length_b                   19.6906(6)
_cell_length_c                   13.9703(4)
_cell_measurement_reflns_used    17175
_cell_measurement_temperature    150(2)
_cell_measurement_theta_max      30.56
_cell_measurement_theta_min      2.29
_cell_volume                     3269.80(17)
_computing_cell_refinement       'Bruker SAINT'
_computing_data_collection       'Bruker APEX 2'
_computing_data_reduction        'Bruker SAINT'
_computing_molecular_graphics    'Bruker SHELXTL'
_computing_publication_material  'Bruker SHELXTL and local programs'
_computing_structure_refinement  'SHELXL-2018/3 (Sheldrick, 2018)'
_computing_structure_solution    'Bruker SHELXTL'
_diffrn_ambient_temperature      150(2)
_diffrn_measured_fraction_theta_full 0.999
_diffrn_measured_fraction_theta_max 0.996
_diffrn_measurement_device_type  'Bruker APEX 2 CCD diffractometer'
_diffrn_measurement_method       '\w rotation with narrow frames'
_diffrn_radiation_monochromator  graphite
_diffrn_radiation_type           MoK\a
_diffrn_radiation_wavelength     0.71073
_diffrn_reflns_av_R_equivalents  0.0205
_diffrn_reflns_av_unetI/netI     0.0187
_diffrn_reflns_Laue_measured_fraction_full 0.999
_diffrn_reflns_Laue_measured_fraction_max 0.996
_diffrn_reflns_limit_h_max       17
_diffrn_reflns_limit_h_min       -17
_diffrn_reflns_limit_k_max       28
_diffrn_reflns_limit_k_min       -28
_diffrn_reflns_limit_l_max       19
_diffrn_reflns_limit_l_min       -19
_diffrn_reflns_number            38624
_diffrn_reflns_point_group_measured_fraction_full 0.999
_diffrn_reflns_point_group_measured_fraction_max 0.996
_diffrn_reflns_theta_full        25.242
_diffrn_reflns_theta_max         30.559
_diffrn_reflns_theta_min         1.810
_diffrn_source                   'fine-focus sealed tube'
_exptl_absorpt_coefficient_mu    0.490
_exptl_absorpt_correction_T_max  0.908
_exptl_absorpt_correction_T_min  0.726
_exptl_absorpt_correction_type   multi-scan
_exptl_absorpt_process_details   'SADABS v2007/2, Sheldrick, G. M., (2007)'
_exptl_crystal_colour            Yellow
_exptl_crystal_density_diffrn    1.372
_exptl_crystal_density_method    'not measured'
_exptl_crystal_description       Block
_exptl_crystal_F_000             1392
_exptl_crystal_recrystallization_method
'Re-crystallisation from solvent: methanol/dichloromethane'
_exptl_crystal_size_max          0.700
_exptl_crystal_size_mid          0.430
_exptl_crystal_size_min          0.200
_refine_diff_density_max         0.430
_refine_diff_density_min         -0.499
_refine_diff_density_rms         0.051
_refine_ls_extinction_method     none
_refine_ls_goodness_of_fit_ref   1.036
_refine_ls_hydrogen_treatment    constr
_refine_ls_matrix_type           full
_refine_ls_number_parameters     415
_refine_ls_number_reflns         9988
_refine_ls_number_restraints     0
_refine_ls_restrained_S_all      1.036
_refine_ls_R_factor_all          0.0366
_refine_ls_R_factor_gt           0.0306
_refine_ls_shift/su_max          0.001
_refine_ls_shift/su_mean         0.000
_refine_ls_structure_factor_coef Fsqd
_refine_ls_weighting_details
'w=1/[\s^2^(Fo^2^)+(0.0449P)^2^+1.1089P] where P=(Fo^2^+2Fc^2^)/3'
_refine_ls_weighting_scheme      calc
_refine_ls_wR_factor_gt          0.0829
_refine_ls_wR_factor_ref         0.0871
_reflns_Friedel_coverage         0.000
_reflns_number_gt                8718
_reflns_number_total             9988
_reflns_threshold_expression     'I > 2\s(I)'
_cod_data_source_file            d1dt00287b1.cif
_cod_data_source_block           5
_cod_depositor_comments
'Adding full bibliography for 7706823--7706826.cif.'
_cod_original_sg_symbol_H-M      'P 21/n'
_cod_database_code               7706825
_shelx_shelxl_version_number     2018/3
_shelx_estimated_absorpt_t_min   0.726
_shelx_estimated_absorpt_t_max   0.908
_shelx_res_checksum              25647
_shelx_hkl_checksum              7555