Conjugated Thiophene-Containing Oligoacenes Through Photocyclization: Bent Acenedithiophenes and a Thiahelicene
Agostino Pietrangelo; Brian O. Patrick; Mark J. MacLachlan; Michael O. Wolf; Journal of Organic Chemistry 74 (2009) 4918–4926; doi:10.1021/jo900590u

data_4024630
_publ_section_title
;
Conjugated Thiophene-Containing Oligoacenes Through Photocyclization: Bent
Acenedithiophenes and a Thiahelicene
;
_journal_name_full               'Journal of Organic Chemistry'
_journal_page_first              4918
_journal_page_last               4926
_journal_paper_doi               10.1021/jo900590u
_journal_volume                  74
_journal_year                    2009
_chemical_formula_sum            'C18 H14 O2 S2'
_chemical_formula_weight         326.41
_space_group_IT_number           9
_symmetry_cell_setting           monoclinic
_symmetry_space_group_name_Hall  'C -2yc'
_symmetry_space_group_name_H-M   'C 1 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                 113.627(6)
_cell_angle_gamma                90.00
_cell_formula_units_Z            4
_cell_length_a                   18.008(2)
_cell_length_b                   11.9600(10)
_cell_length_c                   7.8922(7)
_cell_measurement_reflns_used    2689
_cell_measurement_temperature    298(2)
_cell_measurement_theta_max      27.38
_cell_measurement_theta_min      2.47
_cell_volume                     1557.3(3)
_computing_structure_refinement  'SHELXL-97 (Sheldrick, 1997)'
_diffrn_ambient_temperature      298(2)
_diffrn_measured_fraction_theta_full 0.954
_diffrn_measured_fraction_theta_max 0.954
_diffrn_measurement_device_type  'Bruker X8 APEX II'
_diffrn_measurement_method       'area detector'
_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  0.0300
_diffrn_reflns_av_sigmaI/netI    0.0373
_diffrn_reflns_limit_h_max       22
_diffrn_reflns_limit_h_min       -23
_diffrn_reflns_limit_k_max       15
_diffrn_reflns_limit_k_min       -15
_diffrn_reflns_limit_l_max       10
_diffrn_reflns_limit_l_min       -9
_diffrn_reflns_number            7750
_diffrn_reflns_theta_full        28.05
_diffrn_reflns_theta_max         28.05
_diffrn_reflns_theta_min         2.10
_exptl_absorpt_coefficient_mu    0.345
_exptl_absorpt_correction_T_max  0.973
_exptl_absorpt_correction_T_min  0.812
_exptl_absorpt_correction_type   multi-scan
_exptl_crystal_colour            orange
_exptl_crystal_density_diffrn    1.392
_exptl_crystal_density_method    'not measured'
_exptl_crystal_description       tablet
_exptl_crystal_F_000             680
_exptl_crystal_size_max          0.50
_exptl_crystal_size_mid          0.15
_exptl_crystal_size_min          0.08
_refine_diff_density_max         0.401
_refine_diff_density_min         -0.238
_refine_diff_density_rms         0.050
_refine_ls_abs_structure_details 'Flack H D (1983), Acta Cryst. A39, 876-881'
_refine_ls_abs_structure_Flack   0.62(8)
_refine_ls_extinction_method     none
_refine_ls_goodness_of_fit_ref   1.063
_refine_ls_hydrogen_treatment    constr
_refine_ls_matrix_type           full
_refine_ls_number_parameters     202
_refine_ls_number_reflns         3371
_refine_ls_number_restraints     2
_refine_ls_restrained_S_all      1.062
_refine_ls_R_factor_all          0.0493
_refine_ls_R_factor_gt           0.0406
_refine_ls_shift/su_max          0.002
_refine_ls_shift/su_mean         0.000
_refine_ls_structure_factor_coef Fsqd
_refine_ls_weighting_details
'calc w=1/[\s^2^(Fo^2^)+(0.0536P)^2^+0.5159P] where P=(Fo^2^+2Fc^2^)/3'
_refine_ls_weighting_scheme      calc
_refine_ls_wR_factor_gt          0.0990
_refine_ls_wR_factor_ref         0.1051
_reflns_number_gt                2908
_reflns_number_total             3371
_reflns_threshold_expression     >2sigma(I)
_cod_data_source_file            jo900590u_si_002.cif
_cod_data_source_block           mw061
_cod_original_sg_symbol_H-M      'C c'
_cod_database_code               4024630