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_2108201
_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 ad
_chemical_compound_source        'synthesized by the authors'
_chemical_formula_moiety         'C14 H16 N2 O2 S'
_chemical_formula_sum            'C14 H16 N2 O2 S'
_chemical_formula_weight         276.35
_space_group_IT_number           96
_symmetry_cell_setting           tetragonal
_symmetry_space_group_name_Hall  'P 4nw 2abw'
_symmetry_space_group_name_H-M   'P 43 21 2'
_atom_sites_solution_hydrogens   difmap
_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                   7.7430(2)
_cell_length_b                   7.7430(2)
_cell_length_c                   43.5343(14)
_cell_measurement_reflns_used    6416
_cell_measurement_temperature    150(2)
_cell_measurement_theta_max      27.49
_cell_measurement_theta_min      3.23
_cell_volume                     2610.06(13)
_computing_cell_refinement       'Bruker SAINT'
_computing_data_collection       'Bruker APEX2'
_computing_data_reduction        'Bruker SAINT'
_computing_structure_refinement  'SHELXL-2014/7 (Sheldrick, 2014)'
_computing_structure_solution    'SHELXS-97 (Sheldrick, 2008)'
_diffrn_ambient_temperature      150(2)
_diffrn_measured_fraction_theta_full 0.999
_diffrn_measured_fraction_theta_max 0.999
_diffrn_measurement_device_type  'Bruker APEX-II CCD'
_diffrn_measurement_method       '\f and \w 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  0.0264
_diffrn_reflns_av_sigmaI/netI    0.0215
_diffrn_reflns_limit_h_max       10
_diffrn_reflns_limit_h_min       -7
_diffrn_reflns_limit_k_max       10
_diffrn_reflns_limit_k_min       -8
_diffrn_reflns_limit_l_max       56
_diffrn_reflns_limit_l_min       -52
_diffrn_reflns_number            15598
_diffrn_reflns_theta_full        27.50
_diffrn_reflns_theta_max         27.50
_diffrn_reflns_theta_min         1.87
_diffrn_standards_number         0
_exptl_absorpt_coefficient_mu    0.247
_exptl_absorpt_correction_T_max  0.9573
_exptl_absorpt_correction_T_min  0.8938
_exptl_absorpt_correction_type   multi-scan
_exptl_absorpt_process_details
;
SADABS-2014/5 - Bruker AXS area detector scaling and absorption correction
;
_exptl_crystal_colour            colourless
_exptl_crystal_density_diffrn    1.407
_exptl_crystal_density_method    'not measured'
_exptl_crystal_description       bar
_exptl_crystal_F_000             1168
_exptl_crystal_size_max          0.46
_exptl_crystal_size_mid          0.18
_exptl_crystal_size_min          0.18
_refine_diff_density_max         0.213
_refine_diff_density_min         -0.214
_refine_diff_density_rms         0.040
_refine_ls_abs_structure_details 'Flack H D (1983), Acta Cryst. A39, 876-881'
_refine_ls_abs_structure_Flack   -0.06(7)
_refine_ls_extinction_method     none
_refine_ls_goodness_of_fit_ref   1.106
_refine_ls_hydrogen_treatment    constr
_refine_ls_matrix_type           full
_refine_ls_number_parameters     173
_refine_ls_number_reflns         2992
_refine_ls_number_restraints     0
_refine_ls_restrained_S_all      1.106
_refine_ls_R_factor_all          0.0344
_refine_ls_R_factor_gt           0.0304
_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^)+(0.0398P)^2^+0.4448P] where P=(Fo^2^+2Fc^2^)/3'
_refine_ls_weighting_scheme      calc
_refine_ls_wR_factor_gt          0.0732
_refine_ls_wR_factor_ref         0.0754
_reflns_number_gt                2800
_reflns_number_total             2992
_reflns_threshold_expression     I>2\s(I)
_cod_data_source_file            dk5056sup1.cif
_cod_data_source_block           12a
_cod_database_code               2108201
_cod_database_fobs_code          2108201
_shelx_res_checksum              39691
_shelx_hkl_checksum              27971