Nucleophilic activity of a linked bis{guanidine} leading to formation of a dicationic C4N4-heterocycle.
Coles, Martyn P.; Lee, Steven F.; Oakley, Sarah H.; Estiu, Guillermina; Hitchcock, Peter B.; Organic & biomolecular chemistry 5 (2007) 3909–3911; doi:10.1039/b715209d

data_7151197
_publ_section_title
;
 Nucleophilic activity of a linked bis{guanidine} leading to formation
 of a dicationic C4N4-heterocycle.
;
_journal_issue                   24
_journal_name_full               'Organic &amp; biomolecular chemistry'
_journal_page_first              3909
_journal_page_last               3911
_journal_paper_doi               10.1039/b715209d
_journal_volume                  5
_journal_year                    2007
_chemical_compound_source        'synthesis as described'
_chemical_formula_moiety         'C16 H28 N6, 2(C24 H20 B)'
_chemical_formula_sum            'C64 H68 B2 N6'
_chemical_formula_weight         942.86
_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_conform_dict_location     ftp://ftp.iucr.org/pub/cif_core.dic
_audit_conform_dict_name         cif_core.dic
_audit_conform_dict_version      2.3
_audit_creation_date             2005-10-31T15:48:14-00:00
_audit_creation_method           'WinGX routine CIF_UPDATE'
_cell_angle_alpha                90
_cell_angle_beta                 104.766(1)
_cell_angle_gamma                90
_cell_formula_units_Z            2
_cell_length_a                   11.1882(2)
_cell_length_b                   14.3840(3)
_cell_length_c                   16.3407(3)
_cell_measurement_reflns_used    19017
_cell_measurement_temperature    173(2)
_cell_measurement_theta_max      26.022
_cell_measurement_theta_min      3.395
_cell_measurement_wavelength     0.71073
_cell_volume                     2542.88(8)
_computing_cell_refinement       'HKL Scalepack (Otwinowski & Minor 1997)'
_computing_data_collection       'Collect (Nonius BV, 1997-2000)'
_computing_data_reduction
'HKL Denzo and Scalepack (Otwinowski & Minor 1997)'
_computing_molecular_graphics    'Ortep-3 for Windows (Farrugia, 1997)'
_computing_publication_material  'WinGX publication routines (Farrugia, 1999)'
_computing_structure_refinement  'SHELXL-97 (Sheldrick, 1997)'
_computing_structure_solution    'SHELXS-86 (Sheldrick, 1986)'
_diffrn_ambient_temperature      173(2)
_diffrn_detector                 'CCD plate'
_diffrn_detector_area_resol_mean 9
_diffrn_measured_fraction_theta_full 0.99
_diffrn_measured_fraction_theta_max 0.99
_diffrn_measurement_device       '95mm CCD camera on \k-goniostat'
_diffrn_measurement_device_type  KappaCCD
_diffrn_measurement_method       'CCD rotation images, thick slices'
_diffrn_orient_matrix_type       'by Nonius Collect from scalepack cell'
_diffrn_orient_matrix_UB_11      -0.730676E-1
_diffrn_orient_matrix_UB_12      -0.151069E-1
_diffrn_orient_matrix_UB_13      -0.477934E-1
_diffrn_orient_matrix_UB_21      0.424561E-1
_diffrn_orient_matrix_UB_22      -0.576189E-1
_diffrn_orient_matrix_UB_23      -0.121484E-1
_diffrn_orient_matrix_UB_31      -0.374481E-1
_diffrn_orient_matrix_UB_32      -0.358484E-1
_diffrn_orient_matrix_UB_33      0.396667E-1
_diffrn_radiation_monochromator  graphite
_diffrn_radiation_probe          x-ray
_diffrn_radiation_type           MoK\a
_diffrn_radiation_wavelength     0.71073
_diffrn_reflns_av_R_equivalents  0.0803
_diffrn_reflns_av_unetI/netI     0.0412
_diffrn_reflns_limit_h_max       13
_diffrn_reflns_limit_h_min       -13
_diffrn_reflns_limit_k_max       17
_diffrn_reflns_limit_k_min       -17
_diffrn_reflns_limit_l_max       20
_diffrn_reflns_limit_l_min       -20
_diffrn_reflns_number            35826
_diffrn_reflns_theta_full        26.09
_diffrn_reflns_theta_max         26.09
_diffrn_reflns_theta_min         3.46
_diffrn_source                   'Enraf Nonius FR590'
_exptl_absorpt_coefficient_mu    0.072
_exptl_absorpt_correction_type   none
_exptl_crystal_colour            colourless
_exptl_crystal_density_diffrn    1.231
_exptl_crystal_density_method    'not measured'
_exptl_crystal_description       prism
_exptl_crystal_F_000             1008
_exptl_crystal_size_max          0.35
_exptl_crystal_size_mid          0.3
_exptl_crystal_size_min          0.3
_refine_diff_density_max         0.604
_refine_diff_density_min         -0.273
_refine_diff_density_rms         0.055
_refine_ls_extinction_method     none
_refine_ls_goodness_of_fit_ref   1.027
_refine_ls_hydrogen_treatment    constr
_refine_ls_matrix_type           full
_refine_ls_number_parameters     330
_refine_ls_number_reflns         4993
_refine_ls_number_restraints     0
_refine_ls_restrained_S_all      1.027
_refine_ls_R_factor_all          0.0721
_refine_ls_R_factor_gt           0.0578
_refine_ls_shift/su_max          0
_refine_ls_shift/su_mean         0
_refine_ls_structure_factor_coef Fsqd
_refine_ls_weighting_details
'calc w=1/[\s^2^(Fo^2^)+(0.0729P)^2^+1.5891P] where P=(Fo^2^+2Fc^2^)/3'
_refine_ls_weighting_scheme      calc
_refine_ls_wR_factor_gt          0.1451
_refine_ls_wR_factor_ref         0.1547
_reflns_number_gt                4119
_reflns_number_total             4993
_reflns_threshold_expression     >2sigma(I)
_cod_data_source_file            b715209d.txt
_cod_data_source_block           (2b)-oct1605
_cod_original_sg_symbol_H-M      'P 21/c'
_cod_database_code               7151197