Symmetrical non-chelating poly-N-heterocyclic carbenes
Chen, Ying-Hsuan; Peng, Kai-En; Lee, Gene-Hsiang; Peng, Shie-Ming; Chiu, Ching-Wen; RSC Adv. 4 (2014) 62789–; doi:10.1039/C4RA12597E

data_7218830
_publ_section_title
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 Symmetrical non-chelating poly-N-heterocyclic carbenes
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_journal_issue                   107
_journal_name_full               'RSC Adv.'
_journal_page_first              62789
_journal_paper_doi               10.1039/C4RA12597E
_journal_volume                  4
_journal_year                    2014
_chemical_formula_sum            'C36 H36 I2 N8 O4'
_chemical_formula_weight         898.53
_chemical_name_systematic        '[2a]I2'
_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                 114.665(2)
_cell_angle_gamma                90.00
_cell_formula_units_Z            4
_cell_length_a                   21.0444(10)
_cell_length_b                   12.4275(5)
_cell_length_c                   15.2824(7)
_cell_measurement_reflns_used    11333
_cell_measurement_temperature    150(2)
_cell_measurement_theta_max      25.00
_cell_measurement_theta_min      1.95
_cell_volume                     3632.1(3)
_computing_cell_refinement       DENZO-SMN
_computing_data_collection       'NONIUS COLLECT'
_computing_data_reduction        DENZO-SMN
_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      150(2)
_diffrn_measured_fraction_theta_full 0.999
_diffrn_measured_fraction_theta_max 0.999
_diffrn_measurement_device_type  'NONIUS KappaCCD'
_diffrn_measurement_method       '\w 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  0.0566
_diffrn_reflns_av_sigmaI/netI    0.0581
_diffrn_reflns_limit_h_max       24
_diffrn_reflns_limit_h_min       -23
_diffrn_reflns_limit_k_max       14
_diffrn_reflns_limit_k_min       -13
_diffrn_reflns_limit_l_max       18
_diffrn_reflns_limit_l_min       -18
_diffrn_reflns_number            11333
_diffrn_reflns_theta_full        25.00
_diffrn_reflns_theta_max         25.00
_diffrn_reflns_theta_min         1.95
_exptl_absorpt_coefficient_mu    1.782
_exptl_absorpt_correction_T_max  0.952
_exptl_absorpt_correction_T_min  0.865
_exptl_absorpt_correction_type   multi-scan
_exptl_absorpt_process_details   'SORTAV, (Blessing,1995)'
_exptl_crystal_colour            yellow
_exptl_crystal_density_diffrn    1.643
_exptl_crystal_density_method    'not measured'
_exptl_crystal_description       plate
_exptl_crystal_F_000             1784
_exptl_crystal_recrystallization_method
'Re-crystallisation from solvent: acetonitrile, ether'
_exptl_crystal_size_max          0.20
_exptl_crystal_size_mid          0.12
_exptl_crystal_size_min          0.02
_refine_diff_density_max         0.605
_refine_diff_density_min         -0.788
_refine_diff_density_rms         0.105
_refine_ls_extinction_method     none
_refine_ls_goodness_of_fit_ref   1.076
_refine_ls_hydrogen_treatment    constr
_refine_ls_matrix_type           full
_refine_ls_number_parameters     229
_refine_ls_number_reflns         3201
_refine_ls_number_restraints     0
_refine_ls_restrained_S_all      1.076
_refine_ls_R_factor_all          0.0659
_refine_ls_R_factor_gt           0.0377
_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^)+(0.0350P)^2^+9.5697P] where P=(Fo^2^+2Fc^2^)/3'
_refine_ls_weighting_scheme      calc
_refine_ls_wR_factor_gt          0.0802
_refine_ls_wR_factor_ref         0.0968
_reflns_number_gt                2288
_reflns_number_total             3201
_reflns_threshold_expression     >2sigma(I)
_cod_data_source_file            c4ra12597e2.cif
_cod_data_source_block           ic15835
_cod_depositor_comments
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The following automatic conversions were performed:

'_symmetry_cell_setting' value 'Monoclinic' changed to 'monoclinic'
according to
/usr/data/users/saulius/crontab/automatic-downloads/rss-feeds/RSC/lib/dictionaries/cif_core.dic
dictionary named 'cif_core.dic' version 2.4.2 from 2011-04-26.

Automatic conversion script
Id: cif_fix_values 2827 2014-09-09 07:05:25Z andrius 
;
_cod_original_sg_symbol_H-M      C2/c
_cod_database_code               7218830