Methylene-bridged bimetallic α-diimino nickel(II) complexes: synthesis and high efficiency in ethylene polymerization.
Kong, Shaoliang; Song, Kuifeng; Liang, Tongling; Guo, Cun-Yue; Sun, Wen-Hua; Redshaw, Carl; Dalton transactions (Cambridge, England : 2003) 42 (2013) 9176–9187; doi:10.1039/c3dt00023k

data_7022523
_publ_section_title
;
 Methylene-bridged bimetallic \a-diimino nickel(II) complexes: synthesis
 and high efficiency in ethylene polymerization.
;
_journal_issue                   25
_journal_name_full
'Dalton transactions (Cambridge, England : 2003)'
_journal_page_first              9176
_journal_page_last               9187
_journal_paper_doi               10.1039/c3dt00023k
_journal_volume                  42
_journal_year                    2013
_chemical_formula_sum            'C65 H64 Br4 N4 Ni2'
_chemical_formula_weight         1338.26
_chemical_name_systematic
;
?
;
_space_group_IT_number           2
_symmetry_cell_setting           triclinic
_symmetry_space_group_name_Hall  '-P 1'
_symmetry_space_group_name_H-M   'P -1'
_atom_sites_solution_hydrogens   geom
_atom_sites_solution_primary     direct
_atom_sites_solution_secondary   difmap
_audit_creation_method           SHELXL-97
_cell_angle_alpha                73.538(19)
_cell_angle_beta                 80.11(2)
_cell_angle_gamma                86.028(17)
_cell_formula_units_Z            2
_cell_length_a                   10.690(6)
_cell_length_b                   15.864(8)
_cell_length_c                   21.146(9)
_cell_measurement_reflns_used    10204
_cell_measurement_temperature    173(2)
_cell_measurement_theta_max      27.3739
_cell_measurement_theta_min      1.8920
_cell_volume                     3387(3)
_computing_cell_refinement       'CrystalClear (Rigaku Inc., 2007)'
_computing_data_collection       'CrystalClear (Rigaku Inc., 2007)'
_computing_data_reduction        'CrystalClear (Rigaku Inc., 2007)'
_computing_molecular_graphics    'XP in Siemens SHELXTL (Sheldrick, 1994)'
_computing_publication_material  'SHELX97 (Sheldrick, 1997)'
_computing_structure_refinement  'SHELXL-97 (Sheldrick, 1997)'
_computing_structure_solution    'SHELXS-97 (Sheldrick, 1990)'
_diffrn_ambient_temperature      173(2)
_diffrn_measured_fraction_theta_full 0.978
_diffrn_measured_fraction_theta_max 0.978
_diffrn_measurement_device_type  'Saturn724+ CCD'
_diffrn_measurement_method       '\w scans at fixed \c = 45\%'
_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  0.0657
_diffrn_reflns_av_sigmaI/netI    0.1075
_diffrn_reflns_limit_h_max       13
_diffrn_reflns_limit_h_min       -13
_diffrn_reflns_limit_k_max       20
_diffrn_reflns_limit_k_min       -20
_diffrn_reflns_limit_l_max       27
_diffrn_reflns_limit_l_min       -19
_diffrn_reflns_number            28706
_diffrn_reflns_theta_full        27.32
_diffrn_reflns_theta_max         27.32
_diffrn_reflns_theta_min         1.02
_exptl_absorpt_coefficient_mu    2.953
_exptl_absorpt_correction_T_max  1.0000
_exptl_absorpt_correction_T_min  0.5190
_exptl_absorpt_correction_type   multi-scan
_exptl_crystal_colour            brown
_exptl_crystal_density_diffrn    1.312
_exptl_crystal_density_method    'not measured'
_exptl_crystal_description       block
_exptl_crystal_F_000             1356
_exptl_crystal_size_max          0.28
_exptl_crystal_size_mid          0.26
_exptl_crystal_size_min          0.22
_platon_squeeze_details          ' ?'
_refine_diff_density_max         1.002
_refine_diff_density_min         -0.787
_refine_diff_density_rms         0.114
_refine_ls_extinction_method     none
_refine_ls_goodness_of_fit_ref   1.036
_refine_ls_hydrogen_treatment    mixed
_refine_ls_matrix_type           full
_refine_ls_number_parameters     678
_refine_ls_number_reflns         14964
_refine_ls_number_restraints     918
_refine_ls_restrained_S_all      1.031
_refine_ls_R_factor_all          0.1770
_refine_ls_R_factor_gt           0.1090
_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^)+(0.1220P)^2^+7.9495P] where P=(Fo^2^+2Fc^2^)/3'
_refine_ls_weighting_scheme      calc
_refine_ls_wR_factor_gt          0.2659
_refine_ls_wR_factor_ref         0.3112
_reflns_number_gt                7732
_reflns_number_total             14964
_reflns_threshold_expression     >2sigma(I)
_cod_data_source_file            c3dt00023k.txt
_cod_data_source_block           Ni2-1
_cod_original_sg_symbol_H-M      P-1
_cod_database_code               7022523