Crystal structure, spectroscopic studies and theoretical studies of thiobarbituric acid derivatives: understanding the hydrogen-bonding patterns
Sharma, Anamika; Zamisa, Sizwe J.; Noki, Sikabwe; Almarhoon, Zainab; El-Faham, Ayman; de la Torre, Beatriz G.; Albericio, Fernando; Acta Crystallographica Section C 74 (2018) –; doi:10.1107/S2053229618015516

data_2021369
_publ_section_title
;
 Crystal structure, spectroscopic studies and theoretical studies of
 thiobarbituric acid derivatives: understanding the hydrogen-bonding
 patterns
;
_journal_coeditor_code           FP3065
_journal_issue                   12
_journal_name_full               'Acta Crystallographica Section C'
_journal_page_first
;
;
_journal_paper_doi               10.1107/S2053229618015516
_journal_volume                  74
_journal_year                    2018
_chemical_absolute_configuration syn
_chemical_formula_iupac          'C18 H29 N3 O5 S'
_chemical_formula_moiety         'C18 H29 N3 O5 S'
_chemical_formula_sum            'C18 H29 N3 O5 S'
_chemical_formula_weight         399.50
_chemical_name_systematic
'<i>tert</i>-Butyl [1-(1,3-diethyl-4,6-dioxo-2-thioxohexahydropyrimidin-5-yl)-3-methyl-1-oxobutan-2-yl)carbamate'
_space_group_crystal_system      orthorhombic
_space_group_IT_number           19
_space_group_name_Hall           'P 2ac 2ab'
_space_group_name_H-M_alt        'P 21 21 21'
_symmetry_space_group_name_Hall  'P 2ac 2ab'
_symmetry_space_group_name_H-M   'P 21 21 21'
_atom_sites_solution_hydrogens   mixed
_audit_creation_method           SHELXL-2016/6
_cell_angle_alpha                90
_cell_angle_beta                 90
_cell_angle_gamma                90
_cell_formula_units_Z            4
_cell_length_a                   8.3816(12)
_cell_length_b                   9.6258(14)
_cell_length_c                   24.297(3)
_cell_measurement_reflns_used    9709
_cell_measurement_temperature    100(2)
_cell_measurement_theta_max      27.61
_cell_measurement_theta_min      2.28
_cell_volume                     1960.3(5)
_computing_cell_refinement
;
SAINT-Plus (Bruker, 2008)
;
_computing_data_collection
;
APEX2 (Bruker, 2008)
;
_computing_data_reduction
;
SAINT-Plus and XPREP (Bruker, 2008)
;
_computing_molecular_graphics
;
ORTEP-3 (Farrugia, 2012)
;
_computing_publication_material
;
WinGX (Farrugia, 2012)
;
_computing_structure_refinement
;
SHELXL2016 (Sheldrick, 2015b)
;
_computing_structure_solution
;
SHELXT (Sheldrick, 2015a)
;
_diffrn_ambient_temperature      100(2)
_diffrn_measured_fraction_theta_full 1.000
_diffrn_measured_fraction_theta_max 0.986
_diffrn_measurement_device_type  'Bruker APEXII CCD'
_diffrn_measurement_method       '\f and \w scans'
_diffrn_radiation_monochromator  graphite
_diffrn_radiation_source         'sealed tube'
_diffrn_radiation_type           MoK\a
_diffrn_radiation_wavelength     0.71073
_diffrn_reflns_av_R_equivalents  0.000
_diffrn_reflns_av_unetI/netI     0.0361
_diffrn_reflns_limit_h_max       8
_diffrn_reflns_limit_h_min       -10
_diffrn_reflns_limit_k_max       12
_diffrn_reflns_limit_k_min       -12
_diffrn_reflns_limit_l_max       28
_diffrn_reflns_limit_l_min       -31
_diffrn_reflns_number            15360
_diffrn_reflns_theta_full        25.242
_diffrn_reflns_theta_max         27.703
_diffrn_reflns_theta_min         2.276
_exptl_absorpt_coefficient_mu    0.200
_exptl_absorpt_correction_T_max  0.968
_exptl_absorpt_correction_T_min  0.925
_exptl_absorpt_correction_type   multi-scan
_exptl_absorpt_process_details
;
(SADABS; Bruker, 2012)
;
_exptl_crystal_colour            colourless
_exptl_crystal_density_diffrn    1.354
_exptl_crystal_description       block
_exptl_crystal_F_000             856
_exptl_crystal_size_max          0.330
_exptl_crystal_size_mid          0.250
_exptl_crystal_size_min          0.210
_refine_diff_density_max         0.473
_refine_diff_density_min         -0.302
_refine_ls_abs_structure_details
;
Flack <i>x</i> determined using 1707 quotients [(I+)-(I-)]/[(I+)+(I-)]
(Parsons <i>et al.</i>,  2013)
;
_refine_ls_abs_structure_Flack   0.001(2)
_refine_ls_extinction_method     none
_refine_ls_goodness_of_fit_ref   1.043
_refine_ls_hydrogen_treatment    mixed
_refine_ls_matrix_type           full
_refine_ls_number_parameters     264
_refine_ls_number_reflns         15360
_refine_ls_number_restraints     5
_refine_ls_restrained_S_all      1.043
_refine_ls_R_factor_all          0.0303
_refine_ls_R_factor_gt           0.0283
_refine_ls_shift/su_max          0.001
_refine_ls_shift/su_mean         0.000
_refine_ls_structure_factor_coef Fsqd
_refine_ls_weighting_details
'w=1/[\s^2^(Fo^2^)+(0.0272P)^2^+0.5031P] where P=(Fo^2^+2Fc^2^)/3'
_refine_ls_weighting_scheme      calc
_refine_ls_wR_factor_gt          0.0688
_refine_ls_wR_factor_ref         0.0699
_reflns_number_gt                14556
_reflns_number_total             15360
_reflns_threshold_expression     'I > 2\s(I)'
_cod_data_source_file            fp3065sup1.cif
_cod_data_source_block           A06
_cod_database_code               2021369
_cod_database_fobs_code          2021369
_shelx_estimated_absorpt_t_min   0.937
_shelx_estimated_absorpt_t_max   0.959
_shelx_hkl_checksum              98950
_shelx_res_checksum              78956