Generation of Zwitterionic Water Channels: Biszwitterionic Imidazolium Carboxylates as Hydrogen-Bonding Acceptors
Kohmoto, Shigeo; Okuyama, Shinpei; Yokota, Nobuyuki,; Takahashi, Masahiro; Kishikawa, Keiki; Masu, Hyuma; Azumaya, Isao; Crystal Growth & Design 11 (2011) 3698–; doi:10.1021/cg200232b

data_4500742
_publ_section_title
;
 Generation of Zwitterionic Water Channels: Biszwitterionic Imidazolium
 Carboxylates as Hydrogen-Bonding Acceptors
;
_journal_issue                   9
_journal_name_full               'Crystal Growth &amp; Design'
_journal_page_first              3698
_journal_paper_doi               10.1021/cg200232b
_journal_volume                  11
_journal_year                    2011
_chemical_absolute_configuration unk
_chemical_formula_moiety         'C24 H22 N4 O4, 4(O)'
_chemical_formula_sum            'C24 H22 N4 O8'
_chemical_formula_weight         494.46
_chemical_name_systematic
; 
 ? 
;
_space_group_IT_number           4
_symmetry_cell_setting           monoclinic
_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                 107.616(4)
_cell_angle_gamma                90.00
_cell_formula_units_Z            2
_cell_length_a                   7.166(2)
_cell_length_b                   16.621(5)
_cell_length_c                   10.800(4)
_cell_measurement_reflns_used    1393
_cell_measurement_temperature    120
_cell_measurement_theta_max      25.10
_cell_measurement_theta_min      2.33
_cell_volume                     1226.0(7)
_computing_cell_refinement       'APEX2 (Bruker AXS, 2006)'
_computing_data_collection       'APEX2 (Bruker AXS, 2006)'
_computing_data_reduction        'SAINT (Bruker AXS, 2004)'
_computing_molecular_graphics    'XSHEL (Bruker AXS,2002)'
_computing_publication_material  'XCIF (Bruker AXS, 2001)'
_computing_structure_refinement  'SHELXL-97 (Sheldrick, 1997)'
_computing_structure_solution    'SHELXS-97 (Sheldrick, 1997)'
_diffrn_ambient_temperature      120
_diffrn_detector_area_resol_mean 8.333
_diffrn_measured_fraction_theta_full 0.991
_diffrn_measured_fraction_theta_max 0.915
_diffrn_measurement_device_type  'Bruker APEXII CCD area detector'
_diffrn_measurement_method       'omega 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  0.0307
_diffrn_reflns_av_sigmaI/netI    0.0659
_diffrn_reflns_limit_h_max       5
_diffrn_reflns_limit_h_min       -8
_diffrn_reflns_limit_k_max       20
_diffrn_reflns_limit_k_min       -19
_diffrn_reflns_limit_l_max       12
_diffrn_reflns_limit_l_min       -13
_diffrn_reflns_number            5796
_diffrn_reflns_theta_full        25.00
_diffrn_reflns_theta_max         26.85
_diffrn_reflns_theta_min         1.98
_exptl_absorpt_coefficient_mu    0.102
_exptl_absorpt_correction_T_max  0.9949
_exptl_absorpt_correction_T_min  0.9602
_exptl_absorpt_correction_type   empirical
_exptl_absorpt_process_details
;
SADABS Sheldrick 1996
;
_exptl_crystal_colour            colourless
_exptl_crystal_density_diffrn    1.339
_exptl_crystal_density_method    'not measured'
_exptl_crystal_description       plate
_exptl_crystal_F_000             516
_exptl_crystal_size_max          0.40
_exptl_crystal_size_mid          0.20
_exptl_crystal_size_min          0.05
_refine_diff_density_max         0.408
_refine_diff_density_min         -0.279
_refine_diff_density_rms         0.064
_refine_ls_abs_structure_details 'Flack H D (1983), Acta Cryst. A39, 876-881'
_refine_ls_abs_structure_Flack   0.3(18)
_refine_ls_extinction_method     none
_refine_ls_goodness_of_fit_ref   0.993
_refine_ls_hydrogen_treatment    constr
_refine_ls_matrix_type           full
_refine_ls_number_parameters     325
_refine_ls_number_reflns         3962
_refine_ls_number_restraints     1
_refine_ls_restrained_S_all      0.993
_refine_ls_R_factor_all          0.0848
_refine_ls_R_factor_gt           0.0553
_refine_ls_shift/su_max          0.001
_refine_ls_shift/su_mean         0.000
_refine_ls_structure_factor_coef Fsqd
_refine_ls_weighting_details
'calc w=1/[\s^2^(Fo^2^)+(0.0906P)^2^+0.0000P] where P=(Fo^2^+2Fc^2^)/3'
_refine_ls_weighting_scheme      calc
_refine_ls_wR_factor_gt          0.1353
_refine_ls_wR_factor_ref         0.1524
_reflns_number_gt                2871
_reflns_number_total             3962
_reflns_threshold_expression     >2sigma(I)
_cod_data_source_file            cg200232b_si_002.cif
_cod_data_source_block           3(a0909152mas)
_cod_depositor_comments
;
The following automatic conversions were performed:

'_symmetry_cell_setting' value 'Monoclinic' changed to 'monoclinic'
according to /home/saulius/struct/CIF-dictionaries/cif_core.dic
dictionary named 'cif_core.dic' version 2.4.1 from 2010-06-29.

Automatic conversion script
Id: cif_fix_values 1715 2011-07-08 13:25:40Z adriana 
;
_cod_original_sg_symbol_H-M      'P2(1)   '
_cod_database_code               4500742