A small tris(imidazolium) cage forms an N-heterocyclic carbene complex with silver(I).
Willans, Charlotte E; Anderson, Kirsty M; Junk, Peter C; Barbour, Leonard J; Steed, Jonathan W; Chemical communications (Cambridge, England)  (2007) 3634–3636; doi:10.1039/b708692j

data_7102123
_publ_section_title
;
 A small tris(imidazolium) cage forms an N-heterocyclic carbene complex
 with silver(I).
;
_journal_issue                   35
_journal_name_full
'Chemical communications (Cambridge, England)'
_journal_page_first              3634
_journal_page_last               3636
_journal_paper_doi               10.1039/b708692j
_journal_year                    2007
_chemical_formula_moiety         'C39 H49 Ag N6, 2(F6 P)'
_chemical_formula_sum            'C39 H49 Ag F12 N6 P2'
_chemical_formula_weight         999.65
_chemical_name_systematic
;
?
;
_space_group_IT_number           14
_symmetry_cell_setting           monoclinic
_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                 112.441(4)
_cell_angle_gamma                90.00
_cell_formula_units_Z            4
_cell_length_a                   12.4533(12)
_cell_length_b                   15.5863(15)
_cell_length_c                   22.8102(18)
_cell_measurement_temperature    120(2)
_cell_volume                     4092.2(6)
_computing_cell_refinement       SMART
_computing_data_collection       SMART
_computing_data_reduction        SAINT
_computing_molecular_graphics    X-Seed
_computing_publication_material  X-Seed
_computing_structure_refinement  'SHELXL-97 (Sheldrick, 1997)'
_computing_structure_solution    'SHELXS-97 (Sheldrick, 1990)'
_diffrn_ambient_temperature      120(2)
_diffrn_measured_fraction_theta_full 0.996
_diffrn_measured_fraction_theta_max 0.996
_diffrn_measurement_device_type  'SMART 1k'
_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  0.3042
_diffrn_reflns_av_sigmaI/netI    0.3135
_diffrn_reflns_limit_h_max       17
_diffrn_reflns_limit_h_min       -16
_diffrn_reflns_limit_k_max       21
_diffrn_reflns_limit_k_min       -21
_diffrn_reflns_limit_l_max       31
_diffrn_reflns_limit_l_min       -31
_diffrn_reflns_number            48483
_diffrn_reflns_theta_full        29.18
_diffrn_reflns_theta_max         29.18
_diffrn_reflns_theta_min         1.62
_exptl_absorpt_coefficient_mu    0.664
_exptl_absorpt_correction_T_max  1.0000
_exptl_absorpt_correction_T_min  0.641796
_exptl_absorpt_correction_type   multi-scan
_exptl_absorpt_process_details   SADABS
_exptl_crystal_colour            colourless
_exptl_crystal_density_diffrn    1.623
_exptl_crystal_density_method    'not measured'
_exptl_crystal_description       plate
_exptl_crystal_F_000             2040
_exptl_crystal_size_max          0.20
_exptl_crystal_size_mid          0.10
_exptl_crystal_size_min          0.10
_refine_diff_density_max         0.723
_refine_diff_density_min         -0.600
_refine_diff_density_rms         0.123
_refine_ls_extinction_method     none
_refine_ls_goodness_of_fit_ref   1.010
_refine_ls_hydrogen_treatment    calc
_refine_ls_matrix_type           full
_refine_ls_number_parameters     557
_refine_ls_number_reflns         11030
_refine_ls_number_restraints     0
_refine_ls_restrained_S_all      1.010
_refine_ls_R_factor_all          0.2866
_refine_ls_R_factor_gt           0.1216
_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^)+(0.0570P)^2^+10.1864P] where P=(Fo^2^+2Fc^2^)/3'
_refine_ls_weighting_scheme      calc
_refine_ls_wR_factor_gt          0.1720
_refine_ls_wR_factor_ref         0.2215
_reflns_number_gt                4288
_reflns_number_total             11030
_reflns_threshold_expression     >2sigma(I)
_cod_data_source_file            b708692j.txt
_cod_data_source_block           c:\rawdat~1\charlo~1\07srv231\work\k
_cod_depositor_comments
;
The following automatic conversions were performed:
'_symmetry_cell_setting' value 'Monoclinic' changed to 'monoclinic'
according to '/home/saulius/struct/CIF-dictionaries/cif_core.dic'
dictionary named 'cif_core.dic' version 2.4.1 from 2010-06-29.

Automatic conversion script
Id: cif_fix_enum 1527 2010-12-29 10:47:43Z saulius 
;
_cod_original_sg_symbol_H-M      P2(1)/c
_cod_database_code               7102123