Direct synthesis of cis-dihalido-bis(NHC) complex of nickel(II) and catalytic application in olefin addition polymerization: effect of halogen co-ligands and density functional theory study.
Zhang, Dao; Zhou, Sen; Li, Zhiming; Wang, Quanrui; Weng, Linhong; Dalton transactions (Cambridge, England : 2003) 42 (2013) 12020–12030; doi:10.1039/c3dt50957e

data_7023186
_publ_section_title
;
 Direct synthesis of cis-dihalido-bis(NHC) complex of nickel(II) and
 catalytic application in olefin addition polymerization: effect of
 halogen co-ligands and density functional theory study.
;
_journal_issue                   33
_journal_name_full
'Dalton transactions (Cambridge, England : 2003)'
_journal_page_first              12020
_journal_page_last               12030
_journal_paper_doi               10.1039/c3dt50957e
_journal_volume                  42
_journal_year                    2013
_chemical_formula_sum            'C40 H46 Br2 N6 Ni'
_chemical_formula_weight         829.36
_chemical_name_systematic
; 
 ? 
;
_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'
_symmetry_space_group_name_Hall  '-P 2yn'
_symmetry_space_group_name_H-M   'P 1 21/n 1'
_atom_sites_solution_hydrogens   mixed
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_cell_angle_beta                 91.024(5)
_cell_angle_gamma                90
_cell_formula_units_Z            2
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_cell_length_c                   14.351(5)
_cell_measurement_reflns_used    797
_cell_measurement_temperature    293(2)
_cell_measurement_theta_max      24.317
_cell_measurement_theta_min      2.567
_cell_volume                     1952.2(12)
_computing_cell_refinement       'Bruker SMART'
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_computing_data_reduction        'Bruker SHELXTL'
_computing_molecular_graphics    'Bruker SHELXTL'
_computing_publication_material  'Bruker SHELXTL'
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_computing_structure_solution    'Bruker SHELXTL'
_diffrn_ambient_temperature      293(2)
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_diffrn_measured_fraction_theta_max 0.999
_diffrn_measurement_device_type  'CCD area detector'
_diffrn_measurement_method       'phi and omega scans'
_diffrn_radiation_type           MoK\a
_diffrn_radiation_wavelength     0.71073
_diffrn_reflns_av_R_equivalents  0.0414
_diffrn_reflns_av_unetI/netI     0.0537
_diffrn_reflns_Laue_measured_fraction_full 1.000
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_diffrn_reflns_limit_k_min       -19
_diffrn_reflns_limit_l_max       17
_diffrn_reflns_limit_l_min       -17
_diffrn_reflns_number            8928
_diffrn_reflns_point_group_measured_fraction_full 1.000
_diffrn_reflns_point_group_measured_fraction_max 0.999
_diffrn_reflns_theta_full        25.242
_diffrn_reflns_theta_max         26.299
_diffrn_reflns_theta_min         1.913
_exptl_absorpt_coefficient_mu    2.579
_exptl_absorpt_correction_T_max  1.000000
_exptl_absorpt_correction_T_min  0.673550
_exptl_absorpt_correction_type   multi-scan
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_refine_diff_density_rms         0.056
_refine_ls_extinction_method     none
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_refine_ls_hydrogen_treatment    mixed
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_refine_ls_number_reflns         3961
_refine_ls_number_restraints     0
_refine_ls_restrained_S_all      0.857
_refine_ls_R_factor_all          0.0559
_refine_ls_R_factor_gt           0.0341
_refine_ls_shift/su_max          0.000
_refine_ls_shift/su_mean         0.000
_refine_ls_structure_factor_coef Fsqd
_refine_ls_weighting_details
; 
 w=1/[\s^2^(Fo^2^)+(0.0334P)^2^] 
 where P=(Fo^2^+2Fc^2^)/3 
;
_refine_ls_weighting_scheme      calc
_refine_ls_wR_factor_gt          0.0684
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_reflns_Friedel_coverage         0.000
_reflns_number_gt                2598
_reflns_number_total             3961
_reflns_threshold_expression     'I > 2\s(I)'
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_shelx_estimated_absorpt_t_min   0.698
_shelx_estimated_absorpt_t_max   0.747
_shelxl_version_number           2013-2
_shelx_res_checksum              89675
_shelx_hkl_checksum              64544