Novel Cr-PNP complexes as catalysts for the trimerisation of ethylene
McGuinness, David S.; Wasserscheid, Peter; Keim, Wilhelm; Hu, Chunhua; Englert, Ulli; Dixon, John T.; Grove, Cronje; Chemical Communications (Cambridge, United Kingdom)  (2003) 334–335; doi:10.1039/b210878j

data_7103956
_publ_section_title
;
 Novel Cr-PNP complexes as catalysts for the trimerisation of ethylene
;
_journal_coden_ASTM              CHCOFS
_journal_issue                   3
_journal_name_full
;
 Chemical Communications (Cambridge, United Kingdom)
;
_journal_page_first              334
_journal_page_last               335
_journal_paper_doi               10.1039/b210878j
_journal_year                    2003
_chemical_formula_sum            'C31 H59 Cl3 Cr N O P2'
_chemical_formula_weight         682.08
_chemical_name_common            'Compound 2'
_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_date             15-02-02
_audit_creation_method           'from SDP and SHELXTL'
_cell_angle_alpha                90.00
_cell_angle_beta                 90.757(13)
_cell_angle_gamma                90.00
_cell_formula_units_Z            4
_cell_length_a                   10.340(3)
_cell_length_b                   16.2779(11)
_cell_length_c                   21.3434(18)
_cell_measurement_reflns_used    25
_cell_measurement_temperature    223(2)
_cell_measurement_theta_max      15
_cell_measurement_theta_min      13
_cell_volume                     3592.1(11)
_computing_cell_refinement       'CAD4 (Enraf-Nonius, 1977)'
_computing_data_collection       'CAD4 (Enraf-Nonius, 1977)'
_computing_data_reduction        'PROCESS MolEN (Fair, 1990)'
_computing_molecular_graphics    'PLATON (Spek, 1990)'
_computing_publication_material  'SHELXTL (Sheldrick, 1998)'
_computing_structure_refinement  'SHELXTL (Sheldrick, 1998)'
_computing_structure_solution    'SHELXTL (Sheldrick, 1998)'
_diffrn_ambient_temperature      223(2)
_diffrn_measured_fraction_theta_full 0.998
_diffrn_measured_fraction_theta_max 0.998
_diffrn_measurement_device_type  'Enraf-Nonius CAD4'
_diffrn_measurement_method       \w/2\q
_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  0.0494
_diffrn_reflns_av_sigmaI/netI    0.0799
_diffrn_reflns_limit_h_max       4
_diffrn_reflns_limit_h_min       -12
_diffrn_reflns_limit_k_max       20
_diffrn_reflns_limit_k_min       0
_diffrn_reflns_limit_l_max       26
_diffrn_reflns_limit_l_min       -26
_diffrn_reflns_number            10559
_diffrn_reflns_theta_full        25.98
_diffrn_reflns_theta_max         25.98
_diffrn_reflns_theta_min         2.18
_diffrn_standards_decay_%        -2.43
_diffrn_standards_interval_time  120
_diffrn_standards_number         3
_exptl_absorpt_coefficient_mu    0.655
_exptl_absorpt_correction_T_max  0.999
_exptl_absorpt_correction_T_min  0.827
_exptl_absorpt_correction_type   empirical
_exptl_crystal_colour            blue-purple
_exptl_crystal_density_diffrn    1.261
_exptl_crystal_density_method    'not measured'
_exptl_crystal_description       prism
_exptl_crystal_F_000             1460
_exptl_crystal_size_max          0.48
_exptl_crystal_size_mid          0.28
_exptl_crystal_size_min          0.20
_refine_diff_density_max         0.775
_refine_diff_density_min         -0.632
_refine_diff_density_rms         0.089
_refine_ls_extinction_method     none
_refine_ls_goodness_of_fit_ref   0.978
_refine_ls_hydrogen_treatment    constr
_refine_ls_matrix_type           full
_refine_ls_number_parameters     352
_refine_ls_number_reflns         7031
_refine_ls_number_restraints     0
_refine_ls_restrained_S_all      0.978
_refine_ls_R_factor_all          0.0917
_refine_ls_R_factor_gt           0.0520
_refine_ls_shift/su_max          0.001
_refine_ls_shift/su_mean         0.000
_refine_ls_structure_factor_coef Fsqd
_refine_ls_weighting_details
'calc w=1/[\s^2^(Fo^2^)+(0.0838P)^2^+0.0000P] where P=(Fo^2^+2Fc^2^)/3'
_refine_ls_weighting_scheme      calc
_refine_ls_wR_factor_gt          0.1279
_refine_ls_wR_factor_ref         0.1399
_reflns_number_gt                4774
_reflns_number_total             7031
_reflns_threshold_expression     >2sigma(I)
_cod_data_source_file            b210878j.txt
_cod_data_source_block           dm2a
_cod_original_sg_symbol_H-M      P2(1)/n
_cod_database_code               7103956