Pincer Chromium(II) and Chromium(III) Complexes Supported by Bis(imino)aryl NCN ligands: Synthesis and Catalysis on Isoprene Polymerization
Liu, Zhizhou; Gao, Wei; Liu, Xiaoming; Luo, Xuyang; Cui, Dongmei; Mu, Ying; Organometallics 30 (2011) 752–; doi:10.1021/om1009236

data_4063762
_publ_section_title
;
 Pincer Chromium(II) and Chromium(III) Complexes Supported by
 Bis(imino)aryl NCN ligands: Synthesis and Catalysis on Isoprene
 Polymerization
;
_journal_issue                   4
_journal_name_full               Organometallics
_journal_page_first              752
_journal_paper_doi               10.1021/om1009236
_journal_volume                  30
_journal_year                    2011
_chemical_formula_sum            'C54 H60 Cl4 Cr3 N4'
_chemical_formula_weight         1062.86
_chemical_name_systematic
; 
 ? 
;
_space_group_IT_number           15
_symmetry_cell_setting           monoclinic
_symmetry_space_group_name_Hall  '-C 2yc'
_symmetry_space_group_name_H-M   'C 1 2/c 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                 121.8020(10)
_cell_angle_gamma                90.00
_cell_formula_units_Z            4
_cell_length_a                   25.3449(17)
_cell_length_b                   12.1107(8)
_cell_length_c                   19.9733(14)
_cell_measurement_temperature    185(2)
_cell_volume                     5210.3(6)
_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      185(2)
_diffrn_measured_fraction_theta_full 0.999
_diffrn_measured_fraction_theta_max 0.999
_diffrn_measurement_device_type  'CCD area detector'
_diffrn_measurement_method       'phi and omega scan'
_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  0.0346
_diffrn_reflns_av_sigmaI/netI    0.0411
_diffrn_reflns_limit_h_max       22
_diffrn_reflns_limit_h_min       -30
_diffrn_reflns_limit_k_max       14
_diffrn_reflns_limit_k_min       -14
_diffrn_reflns_limit_l_max       23
_diffrn_reflns_limit_l_min       -23
_diffrn_reflns_number            13243
_diffrn_reflns_theta_full        25.05
_diffrn_reflns_theta_max         25.05
_diffrn_reflns_theta_min         1.89
_exptl_absorpt_coefficient_mu    0.859
_exptl_absorpt_correction_T_max  0.9345
_exptl_absorpt_correction_T_min  0.9039
_exptl_crystal_colour            purple
_exptl_crystal_density_diffrn    1.355
_exptl_crystal_density_method    'not measured'
_exptl_crystal_description       block
_exptl_crystal_F_000             2208
_exptl_crystal_size_max          0.12
_exptl_crystal_size_mid          0.11
_exptl_crystal_size_min          0.08
_refine_diff_density_max         0.545
_refine_diff_density_min         -0.271
_refine_diff_density_rms         0.068
_refine_ls_extinction_method     none
_refine_ls_goodness_of_fit_ref   1.033
_refine_ls_hydrogen_treatment    constr
_refine_ls_matrix_type           full
_refine_ls_number_parameters     300
_refine_ls_number_reflns         4610
_refine_ls_number_restraints     0
_refine_ls_restrained_S_all      1.033
_refine_ls_R_factor_all          0.0556
_refine_ls_R_factor_gt           0.0398
_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^)+(0.0470P)^2^+5.1837P] where P=(Fo^2^+2Fc^2^)/3'
_refine_ls_weighting_scheme      calc
_refine_ls_wR_factor_gt          0.0929
_refine_ls_wR_factor_ref         0.1009
_reflns_number_gt                3640
_reflns_number_total             4610
_reflns_threshold_expression     >2sigma(I)
_cod_data_source_file            om1009236_si_001.cif
_cod_data_source_block           complex_1a
_cod_original_sg_symbol_H-M      C2/c
_cod_database_code               4063762