Controlled synthesis of nickel(II) dihalides bearing two different or identical N-heterocyclic carbene ligands and the influence of carbene ligands on their structures and catalysis.
Liu, Zhi-hong; Xu, Yan-Chao; Xie, Ling-Zhi; Sun, Hong-Mei; Shen, Qi; Zhang, Yong; Dalton transactions (Cambridge, England : 2003) 40 (2011) 4697–4706; doi:10.1039/c1dt10077g

data_7015777
_publ_section_title
;
 Controlled synthesis of nickel(II) dihalides bearing two different or
 identical N-heterocyclic carbene ligands and the influence of carbene
 ligands on their structures and catalysis.
;
_journal_issue                   17
_journal_name_full
'Dalton transactions (Cambridge, England : 2003)'
_journal_page_first              4697
_journal_page_last               4706
_journal_paper_doi               10.1039/c1dt10077g
_journal_volume                  40
_journal_year                    2011
_chemical_formula_moiety         'C18 H32 Br2 N4 Ni'
_chemical_formula_sum            'C18 H32 Br2 N4 Ni'
_chemical_formula_weight         523.01
_chemical_name_systematic
;
?
;
_space_group_IT_number           14
_symmetry_cell_setting           monoclinic
_symmetry_Int_Tables_number      14
_symmetry_space_group_name_Hall  '-P 2ybc'
_symmetry_space_group_name_H-M   'P 1 21/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                 110.525(5)
_cell_angle_gamma                90.00
_cell_formula_units_Z            4
_cell_length_a                   16.474(4)
_cell_length_b                   8.907(2)
_cell_length_c                   16.744(4)
_cell_measurement_reflns_used    9267
_cell_measurement_temperature    193(2)
_cell_measurement_theta_max      27.5
_cell_measurement_theta_min      3.1
_cell_volume                     2300.9(9)
_computing_cell_refinement       CrystalClear
_computing_data_collection       CrystalClear
_computing_data_reduction        CrystalStructure
_computing_structure_refinement  'SHELXL-97 (Sheldrick, 1997)'
_computing_structure_solution    'SHELXS-97 (Sheldrick, 1990)'
_diffrn_ambient_temperature      193(2)
_diffrn_detector_area_resol_mean 7.31
_diffrn_measured_fraction_theta_full 0.997
_diffrn_measured_fraction_theta_max 0.997
_diffrn_measurement_device_type  'Rigaku Mercury'
_diffrn_measurement_method       \w
_diffrn_radiation_monochromator  graphite
_diffrn_radiation_source         'fine-focus sealed tube'
_diffrn_radiation_type           MoK\a
_diffrn_radiation_wavelength     0.71070
_diffrn_reflns_av_R_equivalents  0.0407
_diffrn_reflns_av_sigmaI/netI    0.0325
_diffrn_reflns_limit_h_max       21
_diffrn_reflns_limit_h_min       -17
_diffrn_reflns_limit_k_max       11
_diffrn_reflns_limit_k_min       -11
_diffrn_reflns_limit_l_max       21
_diffrn_reflns_limit_l_min       -20
_diffrn_reflns_number            25167
_diffrn_reflns_theta_full        27.48
_diffrn_reflns_theta_max         27.48
_diffrn_reflns_theta_min         3.14
_exptl_absorpt_coefficient_mu    4.324
_exptl_absorpt_correction_T_max  0.6717
_exptl_absorpt_correction_T_min  0.2464
_exptl_absorpt_correction_type   multi-scan
_exptl_absorpt_process_details   'Jacobson, R. (1998) Private communication'
_exptl_crystal_colour            red
_exptl_crystal_density_diffrn    1.510
_exptl_crystal_density_method    'not measured'
_exptl_crystal_description       block
_exptl_crystal_F_000             1064
_exptl_crystal_size_max          0.45
_exptl_crystal_size_mid          0.30
_exptl_crystal_size_min          0.10
_refine_diff_density_max         1.738
_refine_diff_density_min         -1.713
_refine_diff_density_rms         0.136
_refine_ls_extinction_method     none
_refine_ls_goodness_of_fit_ref   1.113
_refine_ls_hydrogen_treatment    constr
_refine_ls_matrix_type           full
_refine_ls_number_parameters     238
_refine_ls_number_reflns         5273
_refine_ls_number_restraints     0
_refine_ls_restrained_S_all      1.113
_refine_ls_R_factor_all          0.0809
_refine_ls_R_factor_gt           0.0668
_refine_ls_shift/su_max          0.000
_refine_ls_shift/su_mean         0.000
_refine_ls_structure_factor_coef Fsqd
_refine_ls_weighting_details
'calc w=1/[\s^2^(Fo^2^)+(0.0980P)^2^+5.4539P] where P=(Fo^2^+2Fc^2^)/3'
_refine_ls_weighting_scheme      calc
_refine_ls_wR_factor_gt          0.1804
_refine_ls_wR_factor_ref         0.1906
_reflns_number_gt                4384
_reflns_number_total             5273
_reflns_threshold_expression     >2sigma(I)
_cod_data_source_file            c1dt10077g.txt
_cod_data_source_block           shelxl5
_cod_original_cell_volume        2301.0(10)
_cod_original_sg_symbol_Hall     '-p 2ybc'
_cod_original_sg_symbol_H-M      'p 21/c'
_cod_database_code               7015777