Constrained a/V-peptides: a new stable extended structure in solution without any hydrogen bond and characterized by a four-fold symmetry
Francelin Bouillere; Debby Feytens; Didier Gori; Regis Guillot; Cyrille Kouklovsky; Emeric Miclet; Valerie Alezra; Chem.Commun. 48 (2012) 1982–; doi:10.1039/c2cc16852a

data_7107342
_publ_section_title
;
 Constrained a/V-peptides: a new stable extended structure in solution
 without any hydrogen bond and characterized by a four-fold symmetry
;
_journal_name_full               Chem.Commun.
_journal_page_first              1982
_journal_paper_doi               10.1039/c2cc16852a
_journal_volume                  48
_journal_year                    2012
_chemical_absolute_configuration rmad
_chemical_formula_moiety         'C18 H30 N2 O5'
_chemical_formula_sum            'C18 H30 N2 O5'
_chemical_formula_weight         354.44
_space_group_IT_number           4
_symmetry_cell_setting           monoclinic
_symmetry_Int_Tables_number      4
_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                 96.0450(10)
_cell_angle_gamma                90.00
_cell_formula_units_Z            2
_cell_length_a                   5.7347(3)
_cell_length_b                   17.0484(9)
_cell_length_c                   10.2113(6)
_cell_measurement_reflns_used    6917
_cell_measurement_temperature    100(1)
_cell_measurement_theta_max      39.92
_cell_measurement_theta_min      2.33
_cell_volume                     992.78(9)
_computing_cell_refinement       'Bruker SMART'
_computing_data_collection       'Bruker SMART'
_computing_data_reduction        'Bruker SAINT'
_computing_structure_refinement  'SHELXL-97 (Sheldrick, 1997)'
_computing_structure_solution    'SHELXS-97 (Sheldrick, 1997)'
_diffrn_ambient_temperature      100(1)
_diffrn_measured_fraction_theta_full 0.999
_diffrn_measured_fraction_theta_max 0.911
_diffrn_measurement_device_type  'CCD area detector'
_diffrn_measurement_method       'phi and omega scans'
_diffrn_radiation_monochromator  graphite
_diffrn_radiation_probe          x-ray
_diffrn_radiation_type           MoK\a
_diffrn_radiation_wavelength     0.71073
_diffrn_reflns_av_R_equivalents  0.0345
_diffrn_reflns_av_sigmaI/netI    0.0486
_diffrn_reflns_limit_h_max       7
_diffrn_reflns_limit_h_min       -10
_diffrn_reflns_limit_k_max       24
_diffrn_reflns_limit_k_min       -30
_diffrn_reflns_limit_l_max       16
_diffrn_reflns_limit_l_min       -18
_diffrn_reflns_number            19619
_diffrn_reflns_theta_full        25.00
_diffrn_reflns_theta_max         40.60
_diffrn_reflns_theta_min         2.01
_diffrn_source                   'fine-focus sealed tube'
_diffrn_source_type              'kappa X8 APEX II Bruker ICMMO'
_exptl_absorpt_coefficient_mu    0.086
_exptl_absorpt_correction_T_max  0.9957
_exptl_absorpt_correction_T_min  0.9763
_exptl_absorpt_correction_type   psi-scan
_exptl_absorpt_process_details   SADABS
_exptl_crystal_colour            colorless
_exptl_crystal_density_diffrn    1.186
_exptl_crystal_density_method    'not measured'
_exptl_crystal_description       plate
_exptl_crystal_F_000             384
_exptl_crystal_size_max          0.28
_exptl_crystal_size_mid          0.11
_exptl_crystal_size_min          0.05
_refine_diff_density_max         0.379
_refine_diff_density_min         -0.252
_refine_diff_density_rms         0.052
_refine_ls_abs_structure_details 'Flack H D (1983), Acta Cryst. A39, 876-881'
_refine_ls_abs_structure_Flack   0.1(3)
_refine_ls_extinction_method     none
_refine_ls_goodness_of_fit_ref   1.014
_refine_ls_hydrogen_treatment    constr
_refine_ls_matrix_type           full
_refine_ls_number_parameters     232
_refine_ls_number_reflns         9587
_refine_ls_number_restraints     1
_refine_ls_restrained_S_all      1.014
_refine_ls_R_factor_all          0.0525
_refine_ls_R_factor_gt           0.0414
_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^)+(0.0610P)^2^+0.0000P] where P=(Fo^2^+2Fc^2^)/3'
_refine_ls_weighting_scheme      calc
_refine_ls_wR_factor_gt          0.1001
_refine_ls_wR_factor_ref         0.1053
_reflns_number_gt                8202
_reflns_number_total             9587
_reflns_threshold_expression     >2sigma(I)
_cod_data_source_file            c2cc16852a.txt
_cod_data_source_block           901GuillotICMMO
_cod_original_sg_symbol_H-M      'P 21'
_cod_database_code               7107342