2-Iodo-imidazolium receptor binds oxoanions via charge-assisted halogen bonding.
Cametti, Massimo; Raatikainen, Kari; Metrangolo, Pierangelo; Pilati, Tullio; Terraneo, Giancarlo; Resnati, Giuseppe; Organic & biomolecular chemistry 10 (2012) 1329–1333; doi:10.1039/c1ob06524f

data_7152156
_publ_section_title
;
 2-Iodo-imidazolium receptor binds oxoanions via charge-assisted halogen
 bonding.
;
_journal_issue                   7
_journal_name_full               'Organic &amp; biomolecular chemistry'
_journal_page_first              1329
_journal_page_last               1333
_journal_paper_doi               10.1039/c1ob06524f
_journal_volume                  10
_journal_year                    2012
_chemical_formula_moiety         'C20 H18 I N2 1+, I 1-'
_chemical_formula_sum            'C20 H18 I2 N2'
_chemical_formula_weight         540.16
_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                 92.507(2)
_cell_angle_gamma                90.00
_cell_formula_units_Z            4
_cell_length_a                   8.2333(4)
_cell_length_b                   10.2275(6)
_cell_length_c                   21.9756(12)
_cell_measurement_reflns_used    9041
_cell_measurement_temperature    103(2)
_cell_measurement_theta_max      34.17
_cell_measurement_theta_min      2.20
_cell_volume                     1848.71(17)
_computing_cell_refinement       'Bruker SAINT'
_computing_data_collection       'Bruker APEX2'
_computing_data_reduction        'Bruker SAINT'
_computing_molecular_graphics
;
ORTEP-3 (Farrugia, L.J. (1997) Jour. Appl. Cryst. 30, 565)
Mercury (Macrae, C. F., Edgington, P. R., McCabe, P., Pidcock, E.,
Shields, G. P., Taylor, R., Towler, M. & van de Streek, J. (2006).
J. Appl. Cryst. 39, 453-457
;
_computing_publication_material  SHELXTL
_computing_structure_refinement
'SHELXL (Sheldrick, G. M. (2008). Acta Cryst. A64, 112-122)'
_computing_structure_solution
;
SIR2002 (Burla, M. C., Camalli, M., Carrozzini, B., Cascarano, G. L.,
Giacovazzo, C., Polidori, G. & Spagna, R. (2003).
J. Appl. Cryst. 36, 1103.)
;
_diffrn_ambient_temperature      103(2)
_diffrn_measured_fraction_theta_full 0.990
_diffrn_measured_fraction_theta_max 0.880
_diffrn_measurement_device_type  'Bruker APEX-II CCD'
_diffrn_measurement_method       '\f and \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  0.0267
_diffrn_reflns_av_sigmaI/netI    0.0180
_diffrn_reflns_limit_h_max       11
_diffrn_reflns_limit_h_min       -10
_diffrn_reflns_limit_k_max       16
_diffrn_reflns_limit_k_min       -16
_diffrn_reflns_limit_l_max       34
_diffrn_reflns_limit_l_min       -34
_diffrn_reflns_number            55642
_diffrn_reflns_theta_full        27.99
_diffrn_reflns_theta_max         34.49
_diffrn_reflns_theta_min         0.93
_diffrn_standards_decay_%        0.00
_exptl_absorpt_coefficient_mu    3.406
_exptl_absorpt_correction_T_max  0.7468
_exptl_absorpt_correction_T_min  0.6092
_exptl_absorpt_correction_type   multi-scan
_exptl_absorpt_process_details
'Bruker (2001). SADABS. Bruker AXS Inc., Madison, Wisconsin, USA.'
_exptl_crystal_colour            brown
_exptl_crystal_density_diffrn    1.941
_exptl_crystal_density_method    'not measured'
_exptl_crystal_description       'elongated table'
_exptl_crystal_F_000             1032
_exptl_crystal_size_max          0.36
_exptl_crystal_size_mid          0.16
_exptl_crystal_size_min          0.05
_refine_diff_density_max         3.775
_refine_diff_density_min         -2.434
_refine_diff_density_rms         0.304
_refine_ls_extinction_method     none
_refine_ls_goodness_of_fit_ref   1.316
_refine_ls_hydrogen_treatment    noref
_refine_ls_matrix_type           full
_refine_ls_number_parameters     219
_refine_ls_number_reflns         6886
_refine_ls_number_restraints     0
_refine_ls_restrained_S_all      1.316
_refine_ls_R_factor_all          0.0561
_refine_ls_R_factor_gt           0.0532
_refine_ls_shift/su_max          0.001
_refine_ls_shift/su_mean         0.000
_refine_ls_structure_factor_coef Fsqd
_refine_ls_weighting_details
'w=1/[\s^2^(Fo^2^)+47.6401P] where P=(Fo^2^+2Fc^2^)/3'
_refine_ls_weighting_scheme      calc
_refine_ls_wR_factor_gt          0.1467
_refine_ls_wR_factor_ref         0.1482
_reflns_number_gt                6520
_reflns_number_total             6886
_reflns_threshold_expression     I>2\s(I)
_cod_data_source_file            c1ob06524f.txt
_cod_data_source_block           mc02
_cod_original_sg_symbol_H-M      'P 21/c'
_cod_database_code               7152156