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_4114053
_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            'C31.5 H44 Cl2 F18 N6 O P3'
_chemical_formula_weight         1028.54
_chemical_name_systematic
;
 ?
;
_space_group_IT_number           14
_symmetry_cell_setting           monoclinic
_symmetry_space_group_name_Hall  '-P 2ybc'
_symmetry_space_group_name_H-M   'P 1 21/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                 113.781(3)
_cell_angle_gamma                90.00
_cell_formula_units_Z            4
_cell_length_a                   21.801(4)
_cell_length_b                   11.741(2)
_cell_length_c                   18.512(4)
_cell_measurement_temperature    120(2)
_cell_volume                     4336.1(14)
_computing_cell_refinement       'DENZO-SMN (Otwinowski & Minor, 1997)'
_computing_data_collection       'Collect (Nonius, 1998)'
_computing_data_reduction        'DENZO-SMN (Otwinowski & Minor, 1997)'
_computing_molecular_graphics    'X-Seed (Barbour, 1999)'
_computing_publication_material  'CIFTAB (Sheldrick, 1997)'
_computing_structure_refinement  'SHELXL-97 (Sheldrick, 1997)'
_computing_structure_solution    'SHELXS-97 (Sheldrick, 1990)'
_diffrn_ambient_temperature      120(2)
_diffrn_measured_fraction_theta_full 0.979
_diffrn_measured_fraction_theta_max 0.979
_diffrn_measurement_device_type  'Nonis KappaCCD CCD diffractometer'
_diffrn_measurement_method       'phi & 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  0.1009
_diffrn_reflns_av_sigmaI/netI    0.1385
_diffrn_reflns_limit_h_max       22
_diffrn_reflns_limit_h_min       -25
_diffrn_reflns_limit_k_max       13
_diffrn_reflns_limit_k_min       -13
_diffrn_reflns_limit_l_max       22
_diffrn_reflns_limit_l_min       -19
_diffrn_reflns_number            16725
_diffrn_reflns_theta_full        25.00
_diffrn_reflns_theta_max         25.00
_diffrn_reflns_theta_min         2.45
_diffrn_standards_decay_%        0.0
_exptl_absorpt_coefficient_mu    0.374
_exptl_absorpt_correction_type   multi-scan
_exptl_crystal_density_diffrn    1.575
_exptl_crystal_F_000             2096
_refine_diff_density_max         0.718
_refine_diff_density_min         -0.477
_refine_diff_density_rms         0.092
_refine_ls_extinction_method     none
_refine_ls_goodness_of_fit_ref   1.138
_refine_ls_hydrogen_treatment    mixed
_refine_ls_matrix_type           full
_refine_ls_number_parameters     564
_refine_ls_number_reflns         7471
_refine_ls_number_restraints     0
_refine_ls_restrained_S_all      1.138
_refine_ls_R_factor_all          0.2043
_refine_ls_R_factor_gt           0.1348
_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^)+(0.0794P)^2^+26.3624P] where P=(Fo^2^+2Fc^2^)/3'
_refine_ls_weighting_scheme      calc
_refine_ls_wR_factor_gt          0.2582
_refine_ls_wR_factor_ref         0.2881
_reflns_number_gt                4561
_reflns_number_total             7471
_reflns_threshold_expression     >2sigma(I)
_cod_data_source_file            ja034921wsi20030228_094846.cif
_cod_data_source_block           C:\structs\JWS\Karl\kw3apy2\KW3AMPY2.CIF
_cod_original_cell_volume        4336.3(15)
_cod_original_formula_sum        'C31.50 H44 Cl2 F18 N6 O P3'
_cod_database_code               4114053