Planar beta-linked oligothiophenes based on thieno[3,2-b]thiophene and dithieno[3,2-b:2',3'-d]thiophene fused units.
San Miguel, Lidaris; Porter, 3rd, William W; Matzger, Adam J.; Organic letters 9 (2007) 1005–1008; doi:10.1021/ol0630393

data_1505298
_publ_section_title
;
 Planar beta-linked oligothiophenes based on thieno[3,2-b]thiophene and
 dithieno[3,2-b:2',3'-d]thiophene fused units.
;
_journal_issue                   6
_journal_name_full               'Organic letters'
_journal_page_first              1005
_journal_page_last               1008
_journal_paper_doi               10.1021/ol0630393
_journal_volume                  9
_journal_year                    2007
_chemical_formula_moiety         'C12 H6 S4'
_chemical_formula_sum            'C12 H6 S4'
_chemical_formula_weight         278.41
_chemical_name_common            beta(T2-T2)
_chemical_name_systematic
; 
3,3'-bi(thieno[3,2-b]thiophene)
;
_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'
_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                 105.591(14)
_cell_angle_gamma                90.00
_cell_formula_units_Z            8
_cell_length_a                   20.566(4)
_cell_length_b                   8.9517(19)
_cell_length_c                   12.707(3)
_cell_measurement_reflns_used    5243
_cell_measurement_temperature    295
_cell_measurement_theta_max      66.7
_cell_measurement_theta_min      6.8
_cell_volume                     2253.3(9)
_computing_cell_refinement       PROCESS-AUTO
_computing_data_collection       PROCESS-AUTO
_computing_data_reduction        CrystalStructure
_computing_publication_material  'CrystalStructure 3.7.0'
_computing_structure_refinement  'SHELXL-97 (Sheldrick, 1997)'
_computing_structure_solution    'SHELXS-97 (Sheldrick, 1990)'
_diffrn_ambient_temperature      295
_diffrn_detector_area_resol_mean 10.00
_diffrn_measured_fraction_theta_full 0.951
_diffrn_measured_fraction_theta_max 0.952
_diffrn_measurement_device_type  'Rigaku RAXIS-SPIDER'
_diffrn_measurement_method       \w
_diffrn_radiation_monochromator  graphite
_diffrn_radiation_source         'fine-focus sealed tube'
_diffrn_radiation_type           CuK\a
_diffrn_radiation_wavelength     1.54180
_diffrn_reflns_av_R_equivalents  0.0380
_diffrn_reflns_av_sigmaI/netI    0.0380
_diffrn_reflns_limit_h_max       23
_diffrn_reflns_limit_h_min       -24
_diffrn_reflns_limit_k_max       10
_diffrn_reflns_limit_k_min       -8
_diffrn_reflns_limit_l_max       14
_diffrn_reflns_limit_l_min       -15
_diffrn_reflns_number            6478
_diffrn_reflns_theta_full        66.57
_diffrn_reflns_theta_max         66.57
_diffrn_reflns_theta_min         6.85
_exptl_absorpt_coefficient_mu    7.442
_exptl_absorpt_correction_T_max  0.8654
_exptl_absorpt_correction_T_min  0.3477
_exptl_absorpt_correction_type   multi-scan
_exptl_absorpt_process_details
; 
    Higashi, T. (1995). Program for Absorption Correction.
    Rigaku Corporation, Tokyo, Japan.
;
_exptl_crystal_colour            colorless
_exptl_crystal_density_diffrn    1.641
_exptl_crystal_density_method    'not measured'
_exptl_crystal_description       'hexagonal plate'
_exptl_crystal_F_000             1136
_exptl_crystal_size_max          0.18
_exptl_crystal_size_mid          0.16
_exptl_crystal_size_min          0.02
_refine_diff_density_max         0.281
_refine_diff_density_min         -0.262
_refine_diff_density_rms         0.063
_refine_ls_extinction_method     none
_refine_ls_goodness_of_fit_ref   1.182
_refine_ls_hydrogen_treatment    refall
_refine_ls_matrix_type           full
_refine_ls_number_parameters     146
_refine_ls_number_reflns         1903
_refine_ls_number_restraints     0
_refine_ls_restrained_S_all      1.182
_refine_ls_R_factor_all          0.0503
_refine_ls_R_factor_gt           0.0386
_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^)+(0.0671P)^2^+0.3749P] where P=(Fo^2^+2Fc^2^)/3'
_refine_ls_weighting_scheme      calc
_refine_ls_wR_factor_gt          0.1151
_refine_ls_wR_factor_ref         0.1339
_reflns_number_gt                1408
_reflns_number_total             1903
_reflns_threshold_expression     >2sigma(I)
_cod_data_source_file            ol0630393si20070202_114846.cif
_cod_data_source_block           beta(T2-T2)
_cod_original_cell_volume        2253.3(8)
_cod_database_code               1505298