New Examples of Donor–Acceptor Conjugated Systems Involving the 1,3-Dithiole Moiety
Khodorkovsky, Vladimir; Ellern, Arkady; Moldavsky, Vadim; Acta Crystallographica Section C 54 (1998) 1364–1367; doi:10.1107/S0108270198000602

data_2007590
_publ_section_title
;
 New Examples of Donor--Acceptor Conjugated Systems Involving the
 1,3-Dithiole Moiety
;
_journal_issue                   9
_journal_name_full               'Acta Crystallographica Section C'
_journal_page_first              1364
_journal_page_last               1367
_journal_paper_doi               10.1107/S0108270198000602
_journal_volume                  54
_journal_year                    1998
_chemical_formula_moiety         'C20 H14 O2 S2'
_chemical_formula_sum            'C20 H14 O2 S2'
_chemical_formula_weight         350.43
_chemical_melting_point          255.30(10)
_chemical_name_systematic
;
[6-(4,5-dimethyl-1,3-dithiole-2-ylidene)-5,7-dioxo-6,7-dihydro-5H-dibenzo-
[a.c]cycloheptene]
;
_space_group_IT_number           15
_symmetry_cell_setting           monoclinic
_symmetry_space_group_name_Hall  '-C 2yc'
_symmetry_space_group_name_H-M   'C 1 2/c 1'
_audit_creation_method           SHELX93
_cell_angle_alpha                90.00
_cell_angle_beta                 109.23(3)
_cell_angle_gamma                90.00
_cell_formula_units_Z            4
_cell_length_a                   16.600(3)
_cell_length_b                   13.120(3)
_cell_length_c                   7.960(2)
_cell_measurement_reflns_used    38
_cell_measurement_temperature    293(2)
_cell_measurement_theta_max      15
_cell_measurement_theta_min      8
_cell_volume                     1636.9(7)
_computing_cell_refinement       P3
_computing_data_collection       'P3 (Siemens, 1990)'
_computing_data_reduction        P3
_computing_molecular_graphics    'SHELXTL (Siemens, 1992)'
_computing_structure_refinement  'SHELXL93 (Sheldrick, 1993)'
_computing_structure_solution    'SHELXS86 (Sheldrick, 1990)'
_diffrn_ambient_temperature      293(2)
_diffrn_measurement_device       'Syntex P\=1'
_diffrn_measurement_method       \w-2\q
_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  0.051
_diffrn_reflns_av_sigmaI/netI    0.090
_diffrn_reflns_limit_h_max       20
_diffrn_reflns_limit_h_min       0
_diffrn_reflns_limit_k_max       16
_diffrn_reflns_limit_k_min       -16
_diffrn_reflns_limit_l_max       9
_diffrn_reflns_limit_l_min       -9
_diffrn_reflns_number            3199
_diffrn_reflns_theta_max         26.95
_diffrn_reflns_theta_min         2.02
_diffrn_standards_decay_%        4
_diffrn_standards_interval_count 98
_diffrn_standards_number         2
_exptl_absorpt_coefficient_mu    0.334
_exptl_absorpt_correction_type   none
_exptl_crystal_colour            yellow
_exptl_crystal_density_diffrn    1.422
_exptl_crystal_density_method    'not measured'
_exptl_crystal_description       block
_exptl_crystal_F_000             728
_exptl_crystal_size_max          0.46
_exptl_crystal_size_mid          0.33
_exptl_crystal_size_min          0.20
_refine_diff_density_max         0.184
_refine_diff_density_min         -0.257
_refine_ls_extinction_method     none
_refine_ls_goodness_of_fit_all   0.749
_refine_ls_goodness_of_fit_obs   0.969
_refine_ls_hydrogen_treatment    'H atoms riding'
_refine_ls_matrix_type           full
_refine_ls_number_parameters     110
_refine_ls_number_reflns         1640
_refine_ls_number_restraints     0
_refine_ls_restrained_S_all      0.749
_refine_ls_restrained_S_obs      0.969
_refine_ls_R_factor_all          0.088
_refine_ls_R_factor_obs          .043
_refine_ls_shift/esd_max         0.008
_refine_ls_shift/esd_mean        0.001
_refine_ls_structure_factor_coef Fsqd
_refine_ls_weighting_details
'w = 1/[\s^2^(Fo^2^)+(0.056P)^2^] where P = (Fo^2^+2Fc^2^)/3'
_refine_ls_weighting_scheme      calc
_refine_ls_wR_factor_all         0.109
_refine_ls_wR_factor_obs         .099
_reflns_number_observed          853
_reflns_number_total             1640
_reflns_observed_criterion       I>2\s(I)
_cod_data_source_file            cf1132.cif
_cod_data_source_block           diti
_cod_depositor_comments
;
The following automatic conversions were performed:
'_symmetry_cell_setting' value 'Monoclinic' changed to 'monoclinic'
according to '/home/saulius/struct/CIF-dictionaries/cif_core.dic'
dictionary named 'cif_core.dic' version 2.4.1 from 2010-06-29.

Automatic conversion script
Id: cif_fix_enum 1527 2010-12-29 10:47:43Z saulius 

The following automatic conversions were performed:

'_symmetry_cell_setting' value 'Monoclinic' changed to 'monoclinic'
according to /home/saulius/struct/CIF-dictionaries/cif_core.dic
dictionary named 'cif_core.dic' version 2.4.1 from 2010-06-29.

Automatic conversion script
Id: cif_fix_values 1715 2011-07-08 13:25:40Z adriana 

The following automatic conversions were performed:

'_refine_ls_weighting_scheme' value 'calc w =
1/[\s^2^(Fo^2^)+(0.056P)^2^] where P = (Fo^2^+2Fc^2^)/3' was changed
to 'calc'. New tag '_refine_ls_weighting_details' was created. The
value of the new tag was set to 'w = 1/[\s^2^(Fo^2^)+(0.056P)^2^]
where P = (Fo^2^+2Fc^2^)/3'.

Automatic conversion script
Id: cif_fix_values 3143 2015-03-26 13:38:13Z robertas 
;
_cod_original_cell_volume        1636.9(6)
_cod_original_sg_symbol_H-M      'C 2/c'
_cod_database_code               2007590