A versatile template for the formation of [2]pseudorotaxanes. 1,2-Bis(pyridinium)ethane axles and 24-crown-8 ether wheels.
Loeb, Stephen J.; Tiburcio, Jorge; Vella, Sarah J.; Wisner, James A.; Organic & biomolecular chemistry 4 (2006) 667–680; doi:10.1039/b514528g

data_7150397
_publ_section_title
;
 A versatile template for the formation of [2]pseudorotaxanes.
 1,2-Bis(pyridinium)ethane axles and 24-crown-8 ether wheels.
;
_journal_issue                   4
_journal_name_full               'Organic &amp; biomolecular chemistry'
_journal_page_first              667
_journal_page_last               680
_journal_paper_doi               10.1039/b514528g
_journal_volume                  4
_journal_year                    2006
_chemical_formula_sum            'C30 H50 B2 F8 N2 O10'
_chemical_formula_weight         772.34
_space_group_IT_number           4
_symmetry_cell_setting           monoclinic
_symmetry_Int_Tables_number      4
_symmetry_space_group_name_Hall  'P 2yb'
_symmetry_space_group_name_H-M   'P 1 21 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                 96.5840(10)
_cell_angle_gamma                90.00
_cell_formula_units_Z            2
_cell_length_a                   10.4924(6)
_cell_length_b                   16.5364(10)
_cell_length_c                   10.7738(6)
_cell_measurement_temperature    293(2)
_cell_measurement_theta_max      28.3
_cell_measurement_theta_min      1.5
_cell_volume                     1857.00(19)
_computing_cell_refinement       'Bruker SAINT'
_computing_data_collection       'Bruker SMART'
_computing_data_reduction        'Bruker SHELXTL XPREP'
_computing_molecular_graphics    'Bruker SHELXTL XP'
_computing_publication_material  'Bruker SHELXTL XCIF'
_computing_structure_refinement  'SHELXL-97 (Sheldrick, 1997)'
_computing_structure_solution    'SHELXS-97 (Sheldrick, 1997)'
_diffrn_ambient_temperature      293(2)
_diffrn_measured_fraction_theta_full 1.000
_diffrn_measured_fraction_theta_max 1.000
_diffrn_measurement_device_type  'Bruker APEX CCD'
_diffrn_measurement_method       'hemisphere 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  0.0203
_diffrn_reflns_av_sigmaI/netI    0.0276
_diffrn_reflns_limit_h_max       12
_diffrn_reflns_limit_h_min       -12
_diffrn_reflns_limit_k_max       19
_diffrn_reflns_limit_k_min       -19
_diffrn_reflns_limit_l_max       12
_diffrn_reflns_limit_l_min       -12
_diffrn_reflns_number            14875
_diffrn_reflns_theta_full        25.00
_diffrn_reflns_theta_max         25.00
_diffrn_reflns_theta_min         1.90
_diffrn_standards_decay_%        <1
_diffrn_standards_number         '50 standard frames at start and end'
_exptl_absorpt_coefficient_mu    0.126
_exptl_absorpt_correction_T_max  1.000000
_exptl_absorpt_correction_T_min  0.871299
_exptl_absorpt_correction_type   empirical
_exptl_crystal_colour            block
_exptl_crystal_density_diffrn    1.381
_exptl_crystal_density_meas      ?
_exptl_crystal_density_method    .
_exptl_crystal_description       yellow
_exptl_crystal_F_000             812
_exptl_crystal_size_max          0.30
_exptl_crystal_size_mid          0.24
_exptl_crystal_size_min          0.24
_refine_diff_density_max         0.663
_refine_diff_density_min         -0.456
_refine_diff_density_rms         0.068
_refine_ls_abs_structure_details 'Flack H D (1983), Acta Cryst. A39, 876-881'
_refine_ls_abs_structure_Flack   0.8(14)
_refine_ls_extinction_method     none
_refine_ls_goodness_of_fit_ref   1.083
_refine_ls_hydrogen_treatment    mixed
_refine_ls_matrix_type           full
_refine_ls_number_parameters     477
_refine_ls_number_reflns         6537
_refine_ls_number_restraints     1
_refine_ls_restrained_S_all      1.083
_refine_ls_R_factor_all          0.0891
_refine_ls_R_factor_gt           0.0807
_refine_ls_shift/su_max          0.011
_refine_ls_shift/su_mean         0.000
_refine_ls_structure_factor_coef Fsqd
_refine_ls_weighting_details
'calc w=1/[\s^2^(Fo^2^)+(0.1379P)^2^+1.4729P] where P=(Fo^2^+2Fc^2^)/3'
_refine_ls_weighting_scheme      calc
_refine_ls_wR_factor_gt          0.2265
_refine_ls_wR_factor_ref         0.2357
_reflns_number_gt                5684
_reflns_number_total             6537
_reflns_threshold_expression     >2sigma(I)
_cod_data_source_file            b514528g.txt
_cod_data_source_block
'[2]pseudorotaxane_[(1,2-bis(3-methoxypyridinium)ethane)-24C8][BF4]2'
_cod_original_sg_symbol_H-M      P2(1)
_cod_database_code               7150397