Synthesis and stability of soluble hexacenes.
Purushothaman, Balaji; Parkin, Sean R.; Anthony, John E.; Organic letters 12 (2010) 2060–2063; doi:10.1021/ol100178s

data_1502879
_publ_section_title
;
 Synthesis and stability of soluble hexacenes.
;
_journal_issue                   9
_journal_name_full               'Organic letters'
_journal_page_first              2060
_journal_page_last               2063
_journal_paper_doi               10.1021/ol100178s
_journal_volume                  12
_journal_year                    2010
_chemical_absolute_configuration ad
_chemical_formula_moiety         'C108 H136 Si4'
_chemical_formula_sum            'C108 H136 Si4'
_chemical_formula_weight         1546.53
_space_group_IT_number           4
_symmetry_cell_setting           monoclinic
_symmetry_space_group_name_Hall  'P 2yb'
_symmetry_space_group_name_H-M   'P 1 21 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                 99.938(2)
_cell_angle_gamma                90.00
_cell_formula_units_Z            2
_cell_length_a                   14.0790(7)
_cell_length_b                   14.7642(8)
_cell_length_c                   23.8779(12)
_cell_measurement_reflns_used    9678
_cell_measurement_temperature    90.0(2)
_cell_measurement_theta_max      69.54
_cell_measurement_theta_min      3.41
_cell_volume                     4888.9(4)
_computing_cell_refinement       APEX2
_computing_data_collection       'APEX2 (Bruker-AXS, 2006)'
_computing_data_reduction        APEX2
_computing_molecular_graphics    'XP in SHELXTL (Sheldrick, 1994)'
_computing_publication_material
; 
SHELX97-2 (Sheldrick, 1997) and local procedures 
;
_computing_structure_refinement  'SHELXL-97 (Sheldrick, 1997)'
_computing_structure_solution    'SHELXS-97 (Sheldrick, 1997)'
_diffrn_ambient_temperature      90.0(2)
_diffrn_detector_area_resol_mean 18
_diffrn_measured_fraction_theta_full 0.989
_diffrn_measured_fraction_theta_max 0.989
_diffrn_measurement_device_type  'Bruker X8 Proteum diffractometer'
_diffrn_measurement_method       '\f and \w scans'
_diffrn_radiation_monochromator  'graded multilayer optics'
_diffrn_radiation_source         'fine-focus rotating anode'
_diffrn_radiation_type           CuK\a
_diffrn_radiation_wavelength     1.54178
_diffrn_reflns_av_R_equivalents  0.0690
_diffrn_reflns_av_sigmaI/netI    0.0403
_diffrn_reflns_limit_h_max       17
_diffrn_reflns_limit_h_min       -17
_diffrn_reflns_limit_k_max       17
_diffrn_reflns_limit_k_min       -17
_diffrn_reflns_limit_l_max       28
_diffrn_reflns_limit_l_min       -28
_diffrn_reflns_number            73193
_diffrn_reflns_theta_full        69.69
_diffrn_reflns_theta_max         69.69
_diffrn_reflns_theta_min         1.88
_diffrn_standards_number         0
_exptl_absorpt_coefficient_mu    0.887
_exptl_absorpt_correction_T_max  0.957
_exptl_absorpt_correction_T_min  0.791
_exptl_absorpt_correction_type   multi-scan
_exptl_absorpt_process_details   'Sadabs in APEX2 (BrukerAXS, 2006)'
_exptl_crystal_colour            orange
_exptl_crystal_density_diffrn    1.051
_exptl_crystal_density_method    'not measured'
_exptl_crystal_description       tablet
_exptl_crystal_F_000             1680
_exptl_crystal_size_max          0.20
_exptl_crystal_size_mid          0.12
_exptl_crystal_size_min          0.05
_refine_diff_density_max         0.578
_refine_diff_density_min         -0.379
_refine_diff_density_rms         0.066
_refine_ls_abs_structure_details 'Flack H D (1983), Acta Cryst. A39, 876-881'
_refine_ls_abs_structure_Flack   0.01(2)
_refine_ls_extinction_method     none
_refine_ls_goodness_of_fit_ref   1.022
_refine_ls_hydrogen_treatment    constr
_refine_ls_matrix_type           full
_refine_ls_number_parameters     1053
_refine_ls_number_reflns         18035
_refine_ls_number_restraints     178
_refine_ls_restrained_S_all      1.028
_refine_ls_R_factor_all          0.0692
_refine_ls_R_factor_gt           0.0617
_refine_ls_shift/su_max          0.001
_refine_ls_shift/su_mean         0.000
_refine_ls_structure_factor_coef Fsqd
_refine_ls_weighting_details
'calc w=1/[\s^2^(Fo^2^)+(0.1085P)^2^+3.3698P] where P=(Fo^2^+2Fc^2^)/3'
_refine_ls_weighting_scheme      calc
_refine_ls_wR_factor_gt          0.1650
_refine_ls_wR_factor_ref         0.1756
_reflns_number_gt                16373
_reflns_number_total             18035
_reflns_threshold_expression     >2\s(I)
_cod_data_source_file            ol100178s_si_003.cif
_cod_data_source_block           x07111
_cod_original_sg_symbol_H-M      'P 21'
_cod_database_code               1502879