2,4-dithiouracil: the reproducible H-bonded structural motifs in the complexes with 18-membered crown ethers.
Wang, Wen-Jwu; Ganin, Eduard V.; Fonari, Marina S.; Simonov, Yurii A.; Bocelli, Gabriele; Organic & biomolecular chemistry 3 (2005) 3054–3058; doi:10.1039/b505807d

data_7150193
_publ_section_title
;
 2,4-dithiouracil: the reproducible H-bonded structural motifs in the
 complexes with 18-membered crown ethers.
;
_journal_issue                   16
_journal_name_full               'Organic &amp; biomolecular chemistry'
_journal_page_first              3054
_journal_page_last               3058
_journal_paper_doi               10.1039/b505807d
_journal_volume                  3
_journal_year                    2005
_chemical_formula_moiety         'C20 H36 O6, 2(C4 H4 N2 S2)'
_chemical_formula_sum            'C28 H44 N4 O6 S4'
_chemical_formula_weight         660.91
_chemical_name_common
;
cis-anti-cis (B) isomer (2,3,11,12-Dicyclohexano-
1,4,7,10,13,16-hexaoxacyclooctadecane) bis(pyrimidine-2,4(1H,3H)-
dithione) clathrate
;
_chemical_name_systematic
;
cis-anti-cis (B) isomer
(2,3,11,12-Dicyclohexano-1,4,7,10,13,16-hexaoxacyclooctadecane)
bis(pyrimidine-2,4(1H,3H)-dithione) clathrate
;
_chemical_temperature_decomposition_gt 250
_space_group_IT_number           14
_symmetry_cell_setting           monoclinic
_symmetry_space_group_name_Hall  '-P 2yn'
_symmetry_space_group_name_H-M   'P 1 21/n 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                 109.69(3)
_cell_angle_gamma                90.00
_cell_formula_units_Z            2
_cell_length_a                   11.624(2)
_cell_length_b                   12.698(3)
_cell_length_c                   12.093(2)
_cell_measurement_reflns_used    24
_cell_measurement_temperature    293(2)
_cell_measurement_theta_max      16.39
_cell_measurement_theta_min      7.04
_cell_volume                     1680.6(6)
_computing_structure_refinement  'SHELXL-97 (Sheldrick, 1997)'
_computing_structure_solution    'SHELXS-97 (Sheldrick, 1990)'
_diffrn_ambient_temperature      293(2)
_diffrn_measured_fraction_theta_full 0.998
_diffrn_measured_fraction_theta_max 0.998
_diffrn_measurement_device_type  'Philips Pw1100'
_diffrn_measurement_method       'omega-2theta scan'
_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  0.0430
_diffrn_reflns_av_sigmaI/netI    0.0839
_diffrn_reflns_limit_h_max       13
_diffrn_reflns_limit_h_min       -14
_diffrn_reflns_limit_k_max       15
_diffrn_reflns_limit_k_min       0
_diffrn_reflns_limit_l_max       14
_diffrn_reflns_limit_l_min       0
_diffrn_reflns_number            3454
_diffrn_reflns_theta_full        26.00
_diffrn_reflns_theta_max         26.00
_diffrn_reflns_theta_min         3.21
_diffrn_standards_decay_%        0
_diffrn_standards_interval_count 100
_diffrn_standards_number         1
_exptl_absorpt_coefficient_mu    0.327
_exptl_absorpt_correction_type   none
_exptl_crystal_colour            pale-yellow
_exptl_crystal_density_diffrn    1.306
_exptl_crystal_density_method    'not measured'
_exptl_crystal_description       'triangular based pyramidal crystal'
_exptl_crystal_F_000             704
_exptl_crystal_size_max          0.27
_exptl_crystal_size_mid          0.23
_exptl_crystal_size_min          0.19
_refine_diff_density_max         0.317
_refine_diff_density_min         -0.282
_refine_diff_density_rms         0.063
_refine_ls_extinction_method     none
_refine_ls_goodness_of_fit_ref   0.853
_refine_ls_hydrogen_treatment    mixed
_refine_ls_matrix_type           full
_refine_ls_number_parameters     196
_refine_ls_number_reflns         3302
_refine_ls_number_restraints     2
_refine_ls_restrained_S_all      0.853
_refine_ls_R_factor_all          0.1279
_refine_ls_R_factor_gt           0.0536
_refine_ls_shift/su_max          0.000
_refine_ls_shift/su_mean         0.000
_refine_ls_structure_factor_coef Fsqd
_refine_ls_weighting_details
'calc w=1/[\s^2^(Fo^2^)+(0.0654P)^2^+0.0000P] where P=(Fo^2^+2Fc^2^)/3'
_refine_ls_weighting_scheme      calc
_refine_ls_wR_factor_gt          0.1129
_refine_ls_wR_factor_ref         0.1316
_reflns_number_gt                1669
_reflns_number_total             3302
_reflns_threshold_expression     >2sigma(I)
_cod_data_source_file            b505807d.txt
_cod_data_source_block           dtu2
_cod_depositor_comments
;
The following automatic conversions were performed:

'_chemical_melting_point' tag was changed to
'_chemical_temperature_decomposition_gt' since the value was
specified 'more than' ('>') a certain temperature. The value '>250
(decomp)' was changed to '250' - it should be numeric and without a
unit designator.

Automatic conversion script
Id: cif_fix_values 1646 2011-03-28 12:23:43Z adriana 
;
_cod_original_sg_symbol_H-M      P21/n
_cod_database_code               7150193