Hydrogen-Bonded Helices for Anion Binding and Separation
Custelcean, Radu; Jiang, De-en; Hay, Benjamin P.; Luo, Wensui; Gu, Baohua; Crystal Growth & Design 8 (2008) 1909–; doi:10.1021/cg800137e

data_4503607
_publ_section_title
;
 Hydrogen-Bonded Helices for Anion Binding and Separation
;
_journal_issue                   6
_journal_name_full               'Crystal Growth &amp; Design'
_journal_page_first              1909
_journal_paper_doi               10.1021/cg800137e
_journal_volume                  8
_journal_year                    2008
_chemical_formula_sum            'C11 H11 I0.78 N4.22 O1.66'
_chemical_formula_weight         327.86
_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                 102.8190(10)
_cell_angle_gamma                90.00
_cell_formula_units_Z            4
_cell_length_a                   12.2248(10)
_cell_length_b                   7.6978(6)
_cell_length_c                   13.6339(11)
_cell_measurement_temperature    173(2)
_cell_volume                     1251.03(17)
_computing_structure_refinement  'SHELXL-97 (Sheldrick, 1997)'
_computing_structure_solution    'SHELXS-97 (Sheldrick, 1990)'
_diffrn_ambient_temperature      173(2)
_diffrn_measured_fraction_theta_full 1.000
_diffrn_measured_fraction_theta_max 1.000
_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  0.0357
_diffrn_reflns_av_sigmaI/netI    0.0334
_diffrn_reflns_limit_h_max       16
_diffrn_reflns_limit_h_min       -16
_diffrn_reflns_limit_k_max       5
_diffrn_reflns_limit_k_min       -10
_diffrn_reflns_limit_l_max       18
_diffrn_reflns_limit_l_min       -18
_diffrn_reflns_number            9706
_diffrn_reflns_theta_full        28.32
_diffrn_reflns_theta_max         28.32
_diffrn_reflns_theta_min         1.71
_exptl_absorpt_coefficient_mu    2.014
_exptl_absorpt_correction_T_max  0.7941
_exptl_absorpt_correction_T_min  0.4511
_exptl_absorpt_correction_type   empirical
_exptl_crystal_density_diffrn    1.741
_exptl_crystal_density_method    'not measured'
_exptl_crystal_F_000             645
_exptl_crystal_size_max          0.47
_exptl_crystal_size_mid          0.31
_exptl_crystal_size_min          0.12
_refine_diff_density_max         1.569
_refine_diff_density_min         -1.254
_refine_diff_density_rms         0.124
_refine_ls_extinction_method     none
_refine_ls_goodness_of_fit_ref   1.069
_refine_ls_hydrogen_treatment    constr
_refine_ls_matrix_type           full
_refine_ls_number_parameters     161
_refine_ls_number_reflns         3108
_refine_ls_number_restraints     0
_refine_ls_restrained_S_all      1.069
_refine_ls_R_factor_all          0.0377
_refine_ls_R_factor_gt           0.0342
_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^)+(0.0596P)^2^+0.3895P] where P=(Fo^2^+2Fc^2^)/3'
_refine_ls_weighting_scheme      calc
_refine_ls_wR_factor_gt          0.0897
_refine_ls_wR_factor_ref         0.0933
_reflns_number_gt                2760
_reflns_number_total             3108
_reflns_threshold_expression     >2sigma(I)
_cod_data_source_file            cg800137e-file001.cif
_cod_data_source_block           1-H(I)(NO3)
_cod_original_sg_symbol_H-M      P2(1)/c
_cod_database_code               4503607