Slow Anion Exchange, Conformational Equilibria, and Fluorescent Sensing in Venus Flytrap Aminopyridinium-Based Anion Hosts
Karl J. Wallace; Warwick J. Belcher; David R. Turner; Kauser F. Syed; Jonathan W. Steed; Journal of the American Chemical Society 125 (2003) 9699–9715; doi:10.1021/ja034921w

data_4114055
_publ_section_title
;
 Slow Anion Exchange, Conformational Equilibria, and Fluorescent Sensing
 in Venus Flytrap Aminopyridinium-Based Anion Hosts
;
_journal_name_full               'Journal of the American Chemical Society'
_journal_page_first              9699
_journal_page_last               9715
_journal_paper_doi               10.1021/ja034921w
_journal_volume                  125
_journal_year                    2003
_chemical_formula_sum            'C32 H42 Br3 N3 O'
_chemical_formula_weight         724.42
_space_group_IT_number           19
_symmetry_cell_setting           orthorhombic
_symmetry_space_group_name_Hall  'P 2ac 2ab'
_symmetry_space_group_name_H-M   'P 21 21 21'
_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                 90.00
_cell_angle_gamma                90.00
_cell_formula_units_Z            4
_cell_length_a                   10.1837(3)
_cell_length_b                   14.8317(5)
_cell_length_c                   22.35450(10)
_cell_measurement_temperature    100(2)
_cell_volume                     3376.46(15)
_computing_cell_refinement       DENZo-SMN
_computing_data_collection       'Nonius Collect'
_computing_data_reduction        DENZo-SMN
_computing_molecular_graphics    'XSeed (Barbour, 1999)'
_computing_structure_refinement  'SHELXL-97 (Sheldrick, 1997)'
_computing_structure_solution    'SHELXS-97 (Sheldrick, 1990)'
_diffrn_ambient_temperature      100(2)
_diffrn_measured_fraction_theta_full 0.993
_diffrn_measured_fraction_theta_max 0.993
_diffrn_measurement_device_type  KappaCCD
_diffrn_measurement_method       '2o phi+omega frames'
_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  0.0739
_diffrn_reflns_av_sigmaI/netI    0.0662
_diffrn_reflns_limit_h_max       13
_diffrn_reflns_limit_h_min       -13
_diffrn_reflns_limit_k_max       19
_diffrn_reflns_limit_k_min       -16
_diffrn_reflns_limit_l_max       23
_diffrn_reflns_limit_l_min       -29
_diffrn_reflns_number            18283
_diffrn_reflns_theta_full        27.49
_diffrn_reflns_theta_max         27.49
_diffrn_reflns_theta_min         3.03
_diffrn_standards_decay_%        0
_exptl_absorpt_coefficient_mu    3.612
_exptl_absorpt_correction_T_max  0.7140
_exptl_absorpt_correction_T_min  0.4105
_exptl_absorpt_correction_type   Scalepack
_exptl_crystal_density_diffrn    1.425
_exptl_crystal_F_000             1472
_exptl_crystal_size_max          0.30
_exptl_crystal_size_mid          0.25
_exptl_crystal_size_min          0.10
_refine_diff_density_max         1.915
_refine_diff_density_min         -1.001
_refine_diff_density_rms         0.109
_refine_ls_abs_structure_details 'Flack H D (1983), Acta Cryst. A39, 876-881'
_refine_ls_abs_structure_Flack   0.459(13)
_refine_ls_extinction_method     none
_refine_ls_goodness_of_fit_ref   1.050
_refine_ls_hydrogen_treatment    mixed
_refine_ls_matrix_type           full
_refine_ls_number_parameters     357
_refine_ls_number_reflns         7505
_refine_ls_number_restraints     0
_refine_ls_restrained_S_all      1.050
_refine_ls_R_factor_all          0.0591
_refine_ls_R_factor_gt           0.0502
_refine_ls_shift/su_max          0.003
_refine_ls_shift/su_mean         0.000
_refine_ls_structure_factor_coef Fsqd
_refine_ls_weighting_details
'calc w=1/[\s^2^(Fo^2^)+(0.0306P)^2^+11.2554P] where P=(Fo^2^+2Fc^2^)/3'
_refine_ls_weighting_scheme      calc
_refine_ls_wR_factor_gt          0.1098
_refine_ls_wR_factor_ref         0.1139
_reflns_number_gt                6786
_reflns_number_total             7505
_reflns_threshold_expression     >2sigma(I)
_cod_data_source_file            ja034921wsi20030228_094927.cif
_cod_data_source_block           py3eha
_cod_database_code               4114055