Naphthyridine Cyclopentadienyl Chromium Complexes as Single-Site Catalysts for the Formation of Ultrahigh Molecular Weight Polyethylene
Sieb, David; Baker, Robert W.; Wadepohl, Hubert; Enders, Markus; Organometallics 31 (2012) 7368–; doi:10.1021/om300582j

data_4079225
_publ_section_title
;
 Naphthyridine Cyclopentadienyl Chromium Complexes as Single-Site
 Catalysts for the Formation of Ultrahigh Molecular Weight Polyethylene
;
_journal_issue                   21
_journal_name_full               Organometallics
_journal_page_first              7368
_journal_paper_doi               10.1021/om300582j
_journal_volume                  31
_journal_year                    2012
_chemical_formula_sum            'C24 H25 Cl2 Cr N2'
_chemical_formula_weight         464.36
_space_group_IT_number           14
_symmetry_cell_setting           monoclinic
_symmetry_Int_Tables_number      14
_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     heavy
_atom_sites_solution_secondary   difmap
_audit_block_code                en_ds6
_audit_creation_method           SHELXL-97
_cell_angle_alpha                90.00
_cell_angle_beta                 93.674(12)
_cell_angle_gamma                90.00
_cell_formula_units_Z            4
_cell_length_a                   7.183(3)
_cell_length_b                   25.925(12)
_cell_length_c                   11.043(6)
_cell_measurement_reflns_used    8100
_cell_measurement_temperature    100(2)
_cell_measurement_theta_max      31.27
_cell_measurement_theta_min      2.43
_cell_volume                     2052.2(17)
_computing_cell_refinement
;
SAINT (Bruker AXS, 1997-2008). Includes estimated systematic errors
 of the unit cell constants from Monte Carlo simulations.
;
_computing_data_collection       'SMART (Bruker AXS, 1997-2003)'
_computing_data_reduction        'SAINT (Bruker AXS, 1997-2008)'
_computing_molecular_graphics    'PLATON (Spek, 1980-2008)'
_computing_publication_material  'SHELXL-97 (Sheldrick, 1997)'
_computing_structure_refinement  'SHELXL-97 (Sheldrick, 1997)'
_computing_structure_solution    'DIRDIF (Beurskens et al., 1999-2008)'
_diffrn_ambient_temperature      100(2)
_diffrn_measured_fraction_theta_full 0.991
_diffrn_measured_fraction_theta_max 0.991
_diffrn_measurement_device_type  'CCD area detector (Bruker AXS Smart 1000)'
_diffrn_measurement_method       '\f- and \w-scans'
_diffrn_radiation_monochromator  graphite
_diffrn_radiation_probe          x-ray
_diffrn_radiation_type           MoK\a
_diffrn_radiation_wavelength     0.71073
_diffrn_reflns_av_R_equivalents  0.0578
_diffrn_reflns_av_sigmaI/netI    0.0390
_diffrn_reflns_limit_h_max       10
_diffrn_reflns_limit_h_min       -10
_diffrn_reflns_limit_k_max       38
_diffrn_reflns_limit_k_min       0
_diffrn_reflns_limit_l_max       16
_diffrn_reflns_limit_l_min       0
_diffrn_reflns_number            51311
_diffrn_reflns_theta_full        31.51
_diffrn_reflns_theta_max         31.51
_diffrn_reflns_theta_min         2.01
_diffrn_source                   'fine-focus sealed tube'
_exptl_absorpt_coefficient_mu    0.832
_exptl_absorpt_correction_T_max  0.7464
_exptl_absorpt_correction_T_min  0.6753
_exptl_absorpt_correction_type   multi-scan
_exptl_absorpt_process_details
;
multi-scan from symmetry-related measurements (Blessing 1995)
SADABS (Sheldrick & Bruker AXS, 2004-2008)
;
_exptl_crystal_colour            black
_exptl_crystal_density_diffrn    1.503
_exptl_crystal_density_method    'not measured'
_exptl_crystal_description       needle
_exptl_crystal_F_000             964
_exptl_crystal_size_max          0.26
_exptl_crystal_size_mid          0.10
_exptl_crystal_size_min          0.06
_refine_diff_density_max         0.597
_refine_diff_density_min         -0.418
_refine_diff_density_rms         0.086
_refine_ls_abs_structure_details 'Flack H D (1983), Acta Cryst. A39, 876-881'
_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     263
_refine_ls_number_reflns         6784
_refine_ls_number_restraints     0
_refine_ls_restrained_S_all      1.036
_refine_ls_R_factor_all          0.0622
_refine_ls_R_factor_gt           0.0364
_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^)+(0.0423P)^2^+1.4928P] where P=(Fo^2^+2Fc^2^)/3'
_refine_ls_weighting_scheme      calc
_refine_ls_wR_factor_gt          0.0835
_refine_ls_wR_factor_ref         0.0967
_reflns_number_gt                5119
_reflns_number_total             6784
_reflns_threshold_expression     >2sigma(I)
_cod_data_source_file            om300582j_si_001.cif
_cod_data_source_block           complex_6
_cod_original_cell_volume        2052.2(16)
_cod_original_sg_symbol_H-M      'P 21/n'
_cod_database_code               4079225
_audit_block_refno               851