A Road Map to Stable, Soluble, Easily Crystallized Pentacene Derivatives
Anthony, John E.; Eaton, David L.; Parkin, Sean R.; Organic Letters 4 (2002) 15–; doi:10.1021/ol0167356

data_1507427
_publ_section_title
;
 A Road Map to Stable, Soluble, Easily Crystallized Pentacene Derivatives
;
_journal_issue                   1
_journal_name_full               'Organic Letters'
_journal_page_first              15
_journal_paper_doi               10.1021/ol0167356
_journal_volume                  4
_journal_year                    2002
_chemical_formula_sum            'C38 H42 Si2'
_chemical_formula_weight         554.90
_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                 118.1860(19)
_cell_angle_gamma                90.00
_cell_formula_units_Z            8
_cell_length_a                   30.511(2)
_cell_length_b                   7.3870(5)
_cell_length_c                   32.106(2)
_cell_measurement_reflns_used    56443
_cell_measurement_temperature    173(2)
_cell_measurement_theta_max      27.48
_cell_measurement_theta_min      1.00
_cell_volume                     6378.1(7)
_computing_cell_refinement       'SCALEPACK (Otwinowski & Minor, 1997)'
_computing_data_collection       'COLLECT (Nonius, 1998)'
_computing_data_reduction        'DENZO-SMN (Otwinowski & Minor, 1997)'
_computing_molecular_graphics    'XP in Siemens 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, 1990)'
_diffrn_ambient_temperature      173(1)
_diffrn_detector_area_resol_mean 18
_diffrn_measured_fraction_theta_full 1.000
_diffrn_measured_fraction_theta_max 1.000
_diffrn_measurement_device_type  'Nonius KappaCCD diffractometer'
_diffrn_measurement_method       '\w scans at fixed \c = 55\%'
_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  0.0873
_diffrn_reflns_av_sigmaI/netI    0.0796
_diffrn_reflns_limit_h_max       36
_diffrn_reflns_limit_h_min       -36
_diffrn_reflns_limit_k_max       8
_diffrn_reflns_limit_k_min       -8
_diffrn_reflns_limit_l_max       38
_diffrn_reflns_limit_l_min       -38
_diffrn_reflns_number            20627
_diffrn_reflns_theta_full        25.00
_diffrn_reflns_theta_max         25.00
_diffrn_reflns_theta_min         1.44
_diffrn_standards_decay_%        <1
_exptl_absorpt_coefficient_mu    0.136
_exptl_absorpt_correction_type   none
_exptl_crystal_colour            'deep blue'
_exptl_crystal_density_diffrn    1.156
_exptl_crystal_density_method    'not measured'
_exptl_crystal_description       rod
_exptl_crystal_F_000             2384
_exptl_crystal_size_max          0.56
_exptl_crystal_size_mid          0.18
_exptl_crystal_size_min          0.10
_refine_diff_density_max         .421
_refine_diff_density_min         -.382
_refine_diff_density_rms         .046
_refine_ls_extinction_method     none
_refine_ls_goodness_of_fit_ref   1.050
_refine_ls_hydrogen_treatment    mixed
_refine_ls_matrix_type           full
_refine_ls_number_parameters     403
_refine_ls_number_reflns         5620
_refine_ls_number_restraints     661
_refine_ls_restrained_S_all      1.020
_refine_ls_R_factor_all          0.1064
_refine_ls_R_factor_gt           0.0628
_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^)+(0.0431P)^2^+7.7187P] where P=(Fo^2^+2Fc^2^)/3'
_refine_ls_weighting_scheme      calc
_refine_ls_wR_factor_gt          0.1233
_refine_ls_wR_factor_ref         0.1401
_reflns_number_gt                3734
_reflns_number_total             5620
_reflns_threshold_expression     >2sigma(I)
_cod_data_source_file            ol0167356_s2.cif
_cod_data_source_block           k01102
_cod_original_cell_volume        6378.1(8)
_cod_original_sg_symbol_H-M      'C 2/c'
_cod_database_code               1507427