Synthesis and Electrical Properties of Derivatives of 1,4-bis(trialkylsilylethynyl)benzo[2,3-b:5,6-b']diindolizines.
Granger, Devin B.; Mei, Yaochuan; Thorley, Karl J.; Parkin, Sean R.; Jurchescu, Oana D.; Anthony, John E.; Organic letters 18 (2016) 6050–6053; doi:10.1021/acs.orglett.6b02991

data_1555916
_publ_section_title
;
 Synthesis and Electrical Properties of Derivatives of
 1,4-bis(trialkylsilylethynyl)benzo[2,3-b:5,6-b']diindolizines.
;
_journal_issue                   23
_journal_name_full               'Organic letters'
_journal_page_first              6050
_journal_page_last               6053
_journal_paper_doi               10.1021/acs.orglett.6b02991
_journal_volume                  18
_journal_year                    2016
_chemical_formula_moiety         'C28 H28 N2 Si2'
_chemical_formula_sum            'C28 H28 N2 Si2'
_chemical_formula_weight         448.70
_space_group_crystal_system      monoclinic
_space_group_IT_number           14
_space_group_name_Hall           '-P 2ybc'
_space_group_name_H-M_alt        'P 1 21/c 1'
_atom_sites_solution_hydrogens   difmap
_atom_sites_solution_primary     direct
_atom_sites_solution_secondary   difmap
_audit_creation_method           'SHELXL-2014/7 and CIFFIX'
_cell_angle_alpha                90
_cell_angle_beta                 100.885(1)
_cell_angle_gamma                90
_cell_formula_units_Z            2
_cell_length_a                   6.2470(1)
_cell_length_b                   22.6384(4)
_cell_length_c                   8.7822(2)
_cell_measurement_reflns_used    9995
_cell_measurement_temperature    90.0(2)
_cell_measurement_theta_max      68.20
_cell_measurement_theta_min      5.49
_cell_volume                     1219.65(4)
_computing_cell_refinement       '<i>APEX2</i> (Bruker-AXS, 2006)'
_computing_data_collection       '<i>APEX2</i> (Bruker-AXS, 2006)'
_computing_data_reduction        '<i>APEX2</i> (Bruker-AXS, 2006)'
_computing_molecular_graphics    '<i>XP in SHELXTL</i> (Sheldrick, 2008)'
_computing_publication_material
'<i>SHELX</i> (Sheldrick, 2008) and <i>CIFFIX</i> (Parkin, 2013)'
_computing_structure_refinement  '<i>SHELXL-2014/7</i> (Sheldrick, 2015b)'
_computing_structure_solution    '<i>SHELXT</i> (Sheldrick, 2015a)'
_diffrn_ambient_temperature      90.0(2)
_diffrn_detector_area_resol_mean 5.6
_diffrn_measured_fraction_theta_full 0.992
_diffrn_measured_fraction_theta_max 0.988
_diffrn_measurement_device_type  'Bruker X8 Proteum diffractometer'
_diffrn_measurement_method       '\f and \w scans'
_diffrn_radiation_type           CuK\a
_diffrn_radiation_wavelength     1.54178
_diffrn_reflns_av_R_equivalents  0.0411
_diffrn_reflns_av_unetI/netI     0.0241
_diffrn_reflns_Laue_measured_fraction_full 0.992
_diffrn_reflns_Laue_measured_fraction_max 0.988
_diffrn_reflns_limit_h_max       3
_diffrn_reflns_limit_h_min       -7
_diffrn_reflns_limit_k_max       26
_diffrn_reflns_limit_k_min       -27
_diffrn_reflns_limit_l_max       10
_diffrn_reflns_limit_l_min       -10
_diffrn_reflns_number            15908
_diffrn_reflns_point_group_measured_fraction_full 0.992
_diffrn_reflns_point_group_measured_fraction_max 0.988
_diffrn_reflns_theta_full        67.679
_diffrn_reflns_theta_max         68.373
_diffrn_reflns_theta_min         5.489
_diffrn_source                   'fine-focus rotating anode'
_exptl_absorpt_coefficient_mu    1.447
_exptl_absorpt_correction_T_max  0.896
_exptl_absorpt_correction_T_min  0.705
_exptl_absorpt_correction_type   multi-scan
_exptl_absorpt_process_details   '<i>SADABS</i> (Krause et al., 2015)'
_exptl_crystal_colour            red
_exptl_crystal_density_diffrn    1.222
_exptl_crystal_description       rod
_exptl_crystal_F_000             476
_exptl_crystal_size_max          0.260
_exptl_crystal_size_mid          0.120
_exptl_crystal_size_min          0.100
_refine_diff_density_max         0.359
_refine_diff_density_min         -0.267
_refine_diff_density_rms         0.048
_refine_ls_extinction_method     none
_refine_ls_goodness_of_fit_ref   1.046
_refine_ls_hydrogen_treatment    constr
_refine_ls_matrix_type           full
_refine_ls_number_parameters     148
_refine_ls_number_reflns         2215
_refine_ls_number_restraints     0
_refine_ls_restrained_S_all      1.046
_refine_ls_R_factor_all          0.0376
_refine_ls_R_factor_gt           0.0367
_refine_ls_shift/su_max          0.002
_refine_ls_shift/su_mean         0.000
_refine_ls_structure_factor_coef Fsqd
_refine_ls_weighting_details
'w=1/[\s^2^(Fo^2^)+(0.0442P)^2^+0.8994P] where P=(Fo^2^+2Fc^2^)/3'
_refine_ls_weighting_scheme      calc
_refine_ls_wR_factor_gt          0.0943
_refine_ls_wR_factor_ref         0.0951
_reflns_Friedel_coverage         0.000
_reflns_number_gt                2146
_reflns_number_total             2215
_reflns_threshold_expression     'I > 2\s(I)'
_cod_data_source_file            ol6b02991_si_002.cif
_cod_data_source_block           x15114
_cod_original_sg_symbol_H-M      'P 21/c'
_cod_database_code               1555916
_shelx_shelxl_version_number     2014/7
_shelx_estimated_absorpt_t_min   0.705
_shelx_estimated_absorpt_t_max   0.869
_exptl_absorpt_special_details
; 
In addition to absorption, multi-scan techniques also correct other slowly 
varying changes in scale factor over reciprocal space, such as those caused 
by x-ray beam inhomogeneity, goniometer imperfection, crystal decomposition, 
crystal longer than the x-ray beam cross section, absorption by the crystal 
mount etc.  These account, by and large, for much of the difference between 
estimated values of Tmin and Tmax and the _exptl_absorpt_correction_ values. 
;
_shelx_res_checksum              5506
_shelx_hkl_checksum              70004