New Structural Motifs of Lithium N-Heterocyclic Carbene Complexes with Bis(3-tert-butylimidazol-2-ylidene)dialkylborate Ligands†
Shishkov, Igor V.; Rominger, Frank; Hofmann, Peter; Organometallics 28 (2009) 3532–; doi:10.1021/om801097f

data_4068793
_publ_section_title
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 New Structural Motifs of Lithium N-Heterocyclic Carbene Complexes with
 Bis(3-tert-butylimidazol-2-ylidene)dialkylborate Ligands&#x2020;
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_journal_issue                   12
_journal_name_full               Organometallics
_journal_page_first              3532
_journal_paper_doi               10.1021/om801097f
_journal_volume                  28
_journal_year                    2009
_chemical_formula_sum            'C34.5 H62 B2 Li2 N8'
_chemical_formula_weight         624.42
_chemical_name_common            'in paper 4b'
_chemical_name_systematic
;
 ?
;
_space_group_IT_number           86
_symmetry_cell_setting           tetragonal
_symmetry_space_group_name_Hall  '-P 4bc'
_symmetry_space_group_name_H-M   'P 42/n :2'
_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                 90.00
_cell_angle_gamma                90.00
_cell_formula_units_Z            4
_cell_length_a                   12.09860(10)
_cell_length_b                   12.09860(10)
_cell_length_c                   26.06090(10)
_cell_measurement_temperature    200(2)
_cell_volume                     3814.69(5)
_computing_cell_refinement       'Bruker SMART'
_computing_data_collection       'Bruker SMART'
_computing_data_reduction        'Bruker SHELXTL'
_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      200(2)
_diffrn_measured_fraction_theta_full 0.998
_diffrn_measured_fraction_theta_max 0.998
_diffrn_measurement_device_type  'CCD area detector'
_diffrn_measurement_method       'phi and omega scans'
_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  0.0554
_diffrn_reflns_av_sigmaI/netI    0.0306
_diffrn_reflns_limit_h_max       14
_diffrn_reflns_limit_h_min       -14
_diffrn_reflns_limit_k_max       14
_diffrn_reflns_limit_k_min       -14
_diffrn_reflns_limit_l_max       30
_diffrn_reflns_limit_l_min       -30
_diffrn_reflns_number            31499
_diffrn_reflns_theta_full        24.65
_diffrn_reflns_theta_max         24.65
_diffrn_reflns_theta_min         2.30
_exptl_absorpt_coefficient_mu    0.064
_exptl_absorpt_correction_T_max  0.9798
_exptl_absorpt_correction_T_min  0.9687
_exptl_absorpt_correction_type   multi-scan
_exptl_absorpt_process_details   'Blessing, Acta Cryst. (1995) A51 33-38.'
_exptl_crystal_colour            colorless
_exptl_crystal_density_diffrn    1.087
_exptl_crystal_density_method    'not measured'
_exptl_crystal_description       polyhedron
_exptl_crystal_F_000             1364
_exptl_crystal_size_max          0.50
_exptl_crystal_size_mid          0.40
_exptl_crystal_size_min          0.32
_refine_diff_density_max         0.163
_refine_diff_density_min         -0.191
_refine_diff_density_rms         0.033
_refine_ls_extinction_method     none
_refine_ls_goodness_of_fit_ref   1.014
_refine_ls_hydrogen_treatment    mixed
_refine_ls_matrix_type           full
_refine_ls_number_parameters     246
_refine_ls_number_reflns         3231
_refine_ls_number_restraints     3
_refine_ls_restrained_S_all      1.014
_refine_ls_R_factor_all          0.0739
_refine_ls_R_factor_gt           0.0419
_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^)+(0.0561P)^2^+0.9548P] where P=(Fo^2^+2Fc^2^)/3'
_refine_ls_weighting_scheme      calc
_refine_ls_wR_factor_gt          0.1019
_refine_ls_wR_factor_ref         0.1184
_reflns_number_gt                2102
_reflns_number_total             3231
_reflns_threshold_expression     >2sigma(I)
_cod_data_source_file            om801097f_si_002.cif
_cod_data_source_block           ivsh21
_cod_depositor_comments
;
The following automatic conversions were performed:

'_symmetry_cell_setting' value 'Tetragonal' changed to 'tetragonal'
according to /home/saulius/struct/CIF-dictionaries/cif_core.dic
dictionary named 'cif_core.dic' version 2.4.2 from 2011-04-26.

Automatic conversion script
Id: cif_fix_values 1715 2011-07-08 13:25:40Z adriana 
;
_cod_original_sg_symbol_H-M      P4(2)/n
_cod_original_formula_sum        'C34.50 H62 B2 Li2 N8'
_cod_database_code               4068793