Aromatic Oligoamide β-Sheet Foldamers.
Sebaoun, Laure; Maurizot, Victor; Granier, Thierry; Kauffmann, Brice; Huc, Ivan; Journal of the American Chemical Society 136 (2014) 2168–2174; doi:10.1021/ja412729s

data_4120581
_publ_section_title
;
 Aromatic Oligoamide \b-Sheet Foldamers.
;
_journal_issue                   5
_journal_name_full               'Journal of the American Chemical Society'
_journal_page_first              2168
_journal_page_last               2174
_journal_paper_doi               10.1021/ja412729s
_journal_volume                  136
_journal_year                    2014
_chemical_formula_sum            'C12 H8.5 N3.5 O5'
_chemical_formula_weight         281.72
_space_group_IT_number           62
_symmetry_cell_setting           orthorhombic
_symmetry_space_group_name_Hall  '-P 2ac 2n'
_symmetry_space_group_name_H-M   'P n m a'
_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            8
_cell_length_a                   15.9840(10)
_cell_length_b                   16.622(7)
_cell_length_c                   9.1600(10)
_cell_measurement_reflns_used    25
_cell_measurement_temperature    293(2)
_cell_measurement_theta_max      35.0
_cell_measurement_theta_min      25.0
_cell_volume                     2433.7(11)
_computing_structure_refinement
'SHELXL (Sheldrick, G.M. (2008) Acta Cryst. A64, 112-122)'
_computing_structure_solution
'SHELXS (Sheldrick, G.M. (2008) Acta Cryst. A64, 112-122)'
_diffrn_ambient_temperature      293(2)
_diffrn_measured_fraction_theta_full 0.935
_diffrn_measured_fraction_theta_max 0.935
_diffrn_measurement_device_type  'Enraf Nonius cad-4 diffractometer'
_diffrn_measurement_method       \W-2\Scan
_diffrn_radiation_monochromator  graphite
_diffrn_radiation_source         'fine-focus sealed tube'
_diffrn_radiation_type           CuK\a
_diffrn_radiation_wavelength     1.54180
_diffrn_reflns_av_R_equivalents  0.0000
_diffrn_reflns_av_sigmaI/netI    0.0137
_diffrn_reflns_limit_h_max       0
_diffrn_reflns_limit_h_min       -19
_diffrn_reflns_limit_k_max       0
_diffrn_reflns_limit_k_min       -18
_diffrn_reflns_limit_l_max       0
_diffrn_reflns_limit_l_min       -11
_diffrn_reflns_number            2232
_diffrn_reflns_theta_full        69.84
_diffrn_reflns_theta_max         69.84
_diffrn_reflns_theta_min         5.32
_diffrn_standards_decay_%        0
_diffrn_standards_interval_time  90
_diffrn_standards_number         2
_exptl_absorpt_coefficient_mu    1.055
_exptl_absorpt_correction_T_max  0.8167
_exptl_absorpt_correction_T_min  0.7784
_exptl_absorpt_correction_type   psi-scan
_exptl_absorpt_process_details   '(North et al., 1968)'
_exptl_crystal_colour            red
_exptl_crystal_density_diffrn    1.538
_exptl_crystal_density_method    'not measured'
_exptl_crystal_description       prism
_exptl_crystal_F_000             1160
_exptl_crystal_size_max          0.25
_exptl_crystal_size_mid          0.20
_exptl_crystal_size_min          0.20
_refine_diff_density_max         0.196
_refine_diff_density_min         -0.206
_refine_diff_density_rms         0.047
_refine_ls_extinction_coef       0.0167(13)
_refine_ls_extinction_expression Fc^*^=kFc[1+0.001xFc^2^\l^3^/sin(2\q)]^-1/4^
_refine_ls_extinction_method     SHELXL
_refine_ls_goodness_of_fit_ref   1.032
_refine_ls_hydrogen_treatment    constr
_refine_ls_matrix_type           full
_refine_ls_number_parameters     194
_refine_ls_number_reflns         2232
_refine_ls_number_restraints     0
_refine_ls_restrained_S_all      1.032
_refine_ls_R_factor_all          0.0618
_refine_ls_R_factor_gt           0.0507
_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^)+(0.0870P)^2^+0.7371P] where P=(Fo^2^+2Fc^2^)/3'
_refine_ls_weighting_scheme      calc
_refine_ls_wR_factor_gt          0.1404
_refine_ls_wR_factor_ref         0.1518
_reflns_number_gt                1806
_reflns_number_total             2232
_reflns_threshold_expression     >2sigma(I)
_cod_data_source_file            ja412729s_si_003.cif
_cod_data_source_block           vm068b
_cod_original_sg_symbol_H-M      Pnma
_cod_original_formula_sum        'C12 H8.50 N3.50 O5'
_cod_database_code               4120581