[2]Rotaxane molecular shuttles employing 1,2-bis(pyridinium)ethane binding sites and dibenzo-24-crown-8 ethers
Loeb, Stephen J.; Wisner, James A.; Chemical Communications  (2000) 1939–; doi:10.1039/b004784h

data_7115161
_publ_section_title
;
 [2]Rotaxane molecular shuttles employing 1,2-bis(pyridinium)ethane
 binding sites and dibenzo-24-crown-8 ethers
;
_journal_issue                   19
_journal_name_full               'Chemical Communications'
_journal_page_first              1939
_journal_paper_doi               10.1039/b004784h
_journal_year                    2000
_chemical_formula_sum            'C68 H84 B5 F20 N5 O8'
_chemical_formula_weight         1533.45
_chemical_name_systematic
; 
 ? 
;
_space_group_IT_number           9
_symmetry_cell_setting           monoclinic
_symmetry_space_group_name_Hall  'C -2yc'
_symmetry_space_group_name_H-M   'C 1 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                 98.48(2)
_cell_angle_gamma                90.00
_cell_formula_units_Z            4
_cell_length_a                   40.78(2)
_cell_length_b                   15.808(5)
_cell_length_c                   12.336(4)
_cell_measurement_reflns_used    'reflections from 60 data frames'
_cell_measurement_temperature    293(2)
_cell_measurement_theta_max      28.3
_cell_measurement_theta_min      1.5
_cell_volume                     7865(5)
_computing_cell_refinement       'Siemens SAINT'
_computing_data_collection       'Siemens SMART'
_computing_data_reduction        'Siemens SHELXTL XPREP'
_computing_molecular_graphics    'Siemens SHELXTL XP'
_computing_publication_material  'Siemens SHELXTL XCIF'
_computing_structure_refinement  'SHELXL-97 (Sheldrick, 1997)'
_computing_structure_solution    'SHELXS-97 (Sheldrick, 1990)'
_diffrn_ambient_temperature      293(2)
_diffrn_measured_fraction_theta_full 0.989
_diffrn_measured_fraction_theta_max 0.989
_diffrn_measurement_device_type  'Siemens SMART 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  0.0631
_diffrn_reflns_av_sigmaI/netI    0.1191
_diffrn_reflns_limit_h_max       42
_diffrn_reflns_limit_h_min       -45
_diffrn_reflns_limit_k_max       17
_diffrn_reflns_limit_k_min       -9
_diffrn_reflns_limit_l_max       12
_diffrn_reflns_limit_l_min       -13
_diffrn_reflns_number            16889
_diffrn_reflns_theta_full        23.50
_diffrn_reflns_theta_max         23.50
_diffrn_reflns_theta_min         2.02
_diffrn_standards_decay_%        <1
_diffrn_standards_number         '50 standard frames at start and end'
_exptl_absorpt_coefficient_mu    0.115
_exptl_absorpt_correction_T_max  0.4921
_exptl_absorpt_correction_T_min  0.2053
_exptl_absorpt_correction_type   empirical
_exptl_crystal_colour            orange
_exptl_crystal_density_diffrn    1.295
_exptl_crystal_density_meas      ?
_exptl_crystal_density_method    'not measured'
_exptl_crystal_description       block
_exptl_crystal_F_000             3184
_exptl_crystal_size_max          0.34
_exptl_crystal_size_mid          0.22
_exptl_crystal_size_min          0.14
_refine_diff_density_max         0.516
_refine_diff_density_min         -0.274
_refine_diff_density_rms         0.070
_refine_ls_abs_structure_details 'Flack H D (1983), Acta Cryst. A39, 876-881'
_refine_ls_abs_structure_Flack   -1.8(18)
_refine_ls_extinction_coef       0.0017(4)
_refine_ls_extinction_expression Fc^*^=kFc[1+0.001xFc^2^\l^3^/sin(2\q)]^-1/4^
_refine_ls_extinction_method     SHELXL
_refine_ls_goodness_of_fit_ref   0.929
_refine_ls_hydrogen_treatment    mixed
_refine_ls_matrix_type           full
_refine_ls_number_parameters     1001
_refine_ls_number_reflns         10068
_refine_ls_number_restraints     369
_refine_ls_restrained_S_all      0.943
_refine_ls_R_factor_all          0.1982
_refine_ls_R_factor_gt           0.0997
_refine_ls_shift/su_max          0.138
_refine_ls_shift/su_mean         0.024
_refine_ls_structure_factor_coef Fsqd
_refine_ls_weighting_details
'calc w=1/[\s^2^(Fo^2^)+(0.1814P)^2^+0.0000P] where P=(Fo^2^+2Fc^2^)/3'
_refine_ls_weighting_scheme      calc
_refine_ls_wR_factor_gt          0.2451
_refine_ls_wR_factor_ref         0.2999
_reflns_number_gt                4351
_reflns_number_total             10068
_reflns_threshold_expression     >2sigma(I)
_cod_data_source_file            b004784h.txt
_cod_data_source_block           Unsymmetrical
_cod_depositor_comments
;
The following automatic conversions were performed:

'_exptl_crystal_density_meas' value 'not measured' was changed to '?'
- the value is perceived as not measured.

Automatic conversion script
Id: cif_fix_values 3008 2015-01-20 13:52:24Z robertas 
;
_cod_original_cell_volume        7866(5)
_cod_original_sg_symbol_H-M      Cc
_cod_database_code               7115161