Polar crystals with one-dimensional arrays from achiral components: crystal structures of 2:2 complexes of dibenzo-18-crown-6‒imidazolium and pyrazolium perchlorates
Kiviniemi, Sari; Sillanpää, Atte; Lämsä, Markku T.; Pursiainen, Jouni; Nissinen, Maija; Rissanen, Kari; Chemical Communications  (1999) 897–; doi:10.1039/a902014d

data_7115219
_publ_contact_author
;
Prof. Kari Rissanen
;
_publ_section_title
;
 Polar crystals with one-dimensional arrays from achiral components:
 crystal structures of 2:2 complexes of dibenzo-18-crown-6--imidazolium
 and pyrazolium perchlorates
;
_journal_issue                   10
_journal_name_full               'Chemical Communications'
_journal_page_first              897
_journal_paper_doi               10.1039/a902014d
_journal_year                    1999
_chemical_formula_moiety         'C20 H24 O6, (C3 H5 N2)+ (Cl O4)-'
_chemical_formula_sum            'C23 H29 Cl N2 O10'
_chemical_formula_weight         528.93
_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
_cell_angle_alpha                90.00
_cell_angle_beta                 129.34(1)
_cell_angle_gamma                90.00
_cell_formula_units_Z            4
_cell_length_a                   17.802(4)
_cell_length_b                   14.255(4)
_cell_length_c                   12.199(3)
_cell_measurement_reflns_used    25
_cell_measurement_temperature    173.0(1)
_cell_measurement_theta_max      12.25
_cell_measurement_theta_min      8.01
_cell_volume                     2394.2(11)
_computing_cell_refinement       'CAD4 (Enraf-Nonius, 1989)'
_computing_data_collection       'CAD4 (Enraf-Nonius, 1989)'
_computing_data_reduction        'XCAD4/WinGX-97 (Farrugia, 1997)'
_computing_molecular_graphics    'ORTEP3 for Windows (Farrugia, 1997)'
_computing_publication_material  'WinGX-98 (Farrugia, 1998)'
_computing_structure_refinement  'SHELXL-97 (Sheldrick, 1997)'
_computing_structure_solution    'SHELXS-97 (Sheldrick, 1997)'
_diffrn_ambient_temperature      173.0(1)
_diffrn_measured_fraction_theta_full 1.000
_diffrn_measured_fraction_theta_max 1.000
_diffrn_measurement_device_type  'Enraf-Nonius CAD4'
_diffrn_measurement_method       \w/2\q
_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  0.0000
_diffrn_reflns_av_sigmaI/netI    0.0267
_diffrn_reflns_limit_h_max       21
_diffrn_reflns_limit_h_min       0
_diffrn_reflns_limit_k_max       16
_diffrn_reflns_limit_k_min       0
_diffrn_reflns_limit_l_max       11
_diffrn_reflns_limit_l_min       -14
_diffrn_reflns_number            2184
_diffrn_reflns_theta_full        24.97
_diffrn_reflns_theta_max         24.97
_diffrn_reflns_theta_min         2.06
_exptl_absorpt_coefficient_mu    0.221
_exptl_absorpt_correction_T_max  0.9571
_exptl_absorpt_correction_T_min  0.9167
_exptl_absorpt_correction_type   psi-scan
_exptl_crystal_colour            colourless
_exptl_crystal_density_diffrn    1.467
_exptl_crystal_density_method    'not measured'
_exptl_crystal_description       block
_exptl_crystal_F_000             1112
_exptl_crystal_size_max          0.40
_exptl_crystal_size_mid          0.20
_exptl_crystal_size_min          0.20
_refine_diff_density_max         0.243
_refine_diff_density_min         -0.268
_refine_diff_density_rms         0.062
_refine_ls_abs_structure_details 'Flack H D (1983), Acta Cryst. A39, 876-881'
_refine_ls_abs_structure_Flack   0.01(14)
_refine_ls_extinction_method     none
_refine_ls_goodness_of_fit_ref   1.182
_refine_ls_hydrogen_treatment    mixed
_refine_ls_matrix_type           full
_refine_ls_number_parameters     441
_refine_ls_number_reflns         2184
_refine_ls_number_restraints     2
_refine_ls_restrained_S_all      1.181
_refine_ls_R_factor_all          0.0582
_refine_ls_R_factor_gt           0.0420
_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^)+(0.0405P)^2^+7.6190P] where P=(Fo^2^+2Fc^2^)/3'
_refine_ls_weighting_scheme      calc
_refine_ls_wR_factor_gt          0.1150
_refine_ls_wR_factor_ref         0.1208
_reflns_number_gt                1887
_reflns_number_total             2184
_reflns_threshold_expression     >2sigma(I)
_cod_data_source_file            902014d.txt
_cod_data_source_block           sk002
_cod_original_cell_volume        2394(1)
_cod_original_sg_symbol_H-M      Cc
_cod_database_code               7115219