Solid-state structure of cyclic dipeptides: an X-ray and computational study of <i>cis-</i> and <i>trans</i>-diketopiperazines of <i>N</i>-methyl-phenylalanine with the thia-pipecolic acids and thia-prolines
Budesinsky, Milos; Cisarova, Ivana; Borremans, Frans; Martins, Jose C.; Pauwels, Ewald; Acta Crystallographica Section B 73 (2017) 1179–1193; doi:10.1107/S2052520617014731

data_2108199
_publ_section_title
;
 Solid-state structure of cyclic dipeptides: an X-ray and computational
 study of <i>cis-</i> and <i>trans</i>-diketopiperazines of
 <i>N</i>-methyl-phenylalanine with the thia-pipecolic acids and
 thia-prolines
;
_journal_issue                   6
_journal_name_full               'Acta Crystallographica Section B'
_journal_page_first              1179
_journal_page_last               1193
_journal_paper_doi               10.1107/S2052520617014731
_journal_volume                  73
_journal_year                    2017
_chemical_absolute_configuration syn
_chemical_compound_source        'synthesized by the authors'
_chemical_formula_moiety         'C15 H18 N2 O2 S'
_chemical_formula_sum            'C15 H18 N2 O2 S'
_chemical_formula_weight         290.37
_space_group_crystal_system      triclinic
_space_group_IT_number           1
_space_group_name_Hall           'P 1'
_space_group_name_H-M_alt        'P 1'
_symmetry_space_group_name_Hall  'P 1'
_symmetry_space_group_name_H-M   'P 1'
_atom_sites_solution_hydrogens   geom
_atom_sites_solution_secondary   difmap
_audit_creation_method           SHELXL-2014/7
_cell_angle_alpha                79.6877(12)
_cell_angle_beta                 89.2981(14)
_cell_angle_gamma                69.3688(12)
_cell_formula_units_Z            2
_cell_length_a                   7.45360(10)
_cell_length_b                   7.4603(2)
_cell_length_c                   13.6011(3)
_cell_measurement_reflns_used    11838
_cell_measurement_temperature    150(2)
_cell_measurement_theta_max      27.5
_cell_measurement_theta_min      1
_cell_volume                     695.31(3)
_computing_cell_refinement       'COLLECT and DENZO'
_computing_data_collection
'COLLECT (Hooft, 1998) and DENZO (Otwinowski & Minor, 1997)'
_computing_data_reduction        'COLLECT and DENZO'
_computing_structure_refinement  'SHELXL-2014/7 (Sheldrick, 2014)'
_computing_structure_solution    'SIR92 (Altomare et al., 1994)'
_diffrn_ambient_temperature      150(2)
_diffrn_measured_fraction_theta_full 0.997
_diffrn_measured_fraction_theta_max 0.996
_diffrn_measurement_device_type  'Nonius KappaCCD area detector'
_diffrn_measurement_method       '\f and \w scans to fill the Ewald sphere'
_diffrn_radiation_type           MoK\a
_diffrn_radiation_wavelength     0.7107
_diffrn_reflns_av_R_equivalents  0.031
_diffrn_reflns_av_unetI/netI     0.0323
_diffrn_reflns_Laue_measured_fraction_full 0.997
_diffrn_reflns_Laue_measured_fraction_max 0.996
_diffrn_reflns_limit_h_max       9
_diffrn_reflns_limit_h_min       -9
_diffrn_reflns_limit_k_max       9
_diffrn_reflns_limit_k_min       -9
_diffrn_reflns_limit_l_max       17
_diffrn_reflns_limit_l_min       -17
_diffrn_reflns_number            17028
_diffrn_reflns_point_group_measured_fraction_full 0.993
_diffrn_reflns_point_group_measured_fraction_max 0.985
_diffrn_reflns_theta_full        25.241
_diffrn_reflns_theta_max         27.420
_diffrn_reflns_theta_min         2.970
_diffrn_source                   'fine-focus sealed tube'
_exptl_absorpt_coefficient_mu    0.236
_exptl_absorpt_correction_type   none
_exptl_crystal_colour            colourless
_exptl_crystal_density_diffrn    1.387
_exptl_crystal_description       plate
_exptl_crystal_F_000             308
_exptl_crystal_size_max          0.45
_exptl_crystal_size_mid          0.32
_exptl_crystal_size_min          0.2
_refine_diff_density_max         0.218
_refine_diff_density_min         -0.202
_refine_diff_density_rms         0.044
_refine_ls_abs_structure_details
;
 Flack x determined using 2865 quotients [(I+)-(I-)]/[(I+)+(I-)]
 (Parsons, Flack and Wagner, Acta Cryst. B69 (2013) 249-259).
;
_refine_ls_abs_structure_Flack   0.022(19)
_refine_ls_extinction_method     none
_refine_ls_goodness_of_fit_ref   1.040
_refine_ls_hydrogen_treatment    constr
_refine_ls_matrix_type           full
_refine_ls_number_parameters     363
_refine_ls_number_reflns         6242
_refine_ls_number_restraints     3
_refine_ls_restrained_S_all      1.040
_refine_ls_R_factor_all          0.0309
_refine_ls_R_factor_gt           0.0289
_refine_ls_shift/su_max          0.000
_refine_ls_shift/su_mean         0.000
_refine_ls_structure_factor_coef Fsqd
_refine_ls_weighting_details
'w=1/[\s^2^(Fo^2^)+(0.0468P)^2^+0.0971P] where P=(Fo^2^+2Fc^2^)/3'
_refine_ls_weighting_scheme      calc
_refine_ls_wR_factor_gt          0.0770
_refine_ls_wR_factor_ref         0.0785
_reflns_Friedel_coverage         0.978
_reflns_Friedel_fraction_full    0.990
_reflns_Friedel_fraction_max     0.975
_reflns_number_gt                6027
_reflns_number_total             6242
_reflns_threshold_expression     'I > 2\s(I)'
_cod_data_source_file            dk5056sup1.cif
_cod_data_source_block           8a
_cod_database_code               2108199
_cod_database_fobs_code          2108199
_shelx_shelxl_version_number     2014/7
_shelx_res_checksum              65232
_shelx_hkl_checksum              23383