Donor- and acceptor-functionalized dibenzo[a,e]pentalenes: modulation of the electronic band gap
Wilbuer, J.; Grenz, D. C.; Schnakenburg, G.; Esser, B.; Organic Chemistry Frontiers 4 (2017) 658–; doi:10.1039/C6QO00487C

data_1553547
_publ_section_title
;
 Donor- and acceptor-functionalized dibenzo[a,e]pentalenes: modulation of
 the electronic band gap
;
_journal_issue                   5
_journal_name_full               'Organic Chemistry Frontiers'
_journal_page_first              658
_journal_paper_doi               10.1039/C6QO00487C
_journal_volume                  4
_journal_year                    2017
_chemical_formula_moiety         'C18 H12 Br2'
_chemical_formula_sum            'C18 H12 Br2'
_chemical_formula_weight         388.10
_space_group_crystal_system      monoclinic
_space_group_IT_number           14
_space_group_name_Hall           '-P 2yn'
_space_group_name_H-M_alt        'P 1 21/n 1'
_atom_sites_solution_hydrogens   geom
_atom_sites_solution_primary     heavy
_atom_sites_solution_secondary   difmap
_audit_creation_date             2014-08-29
_audit_creation_method
;
Olex2 1.2
(compiled 2014.07.22 svn.r2960 for OlexSys, GUI svn.r4862)
;
_audit_update_record
;
2016-07-26 deposited with the CCDC.
2016-09-27 downloaded from the CCDC.
;
_cell_angle_alpha                90.00
_cell_angle_beta                 96.167(6)
_cell_angle_gamma                90.00
_cell_formula_units_Z            2
_cell_length_a                   5.3248(4)
_cell_length_b                   17.2473(10)
_cell_length_c                   7.6729(6)
_cell_measurement_reflns_used    3627
_cell_measurement_temperature    123
_cell_measurement_theta_max      29.36
_cell_measurement_theta_min      2.92
_cell_volume                     700.59(9)
_computing_molecular_graphics    'Olex2 (Dolomanov et al., 2009)'
_computing_publication_material  'Olex2 (Dolomanov et al., 2009)'
_computing_structure_refinement  'XL (Sheldrick, 2008)'
_computing_structure_solution    'ShelXS (Sheldrick, 2008)'
_diffrn_ambient_temperature      123(2)
_diffrn_detector                 'image plate (34 cm diameter)'
_diffrn_detector_area_resol_mean 6.67
_diffrn_detector_type            STOE
_diffrn_measured_fraction_theta_full 0.999
_diffrn_measured_fraction_theta_max 0.999
_diffrn_measurement_device       '2-circle goniometer'
_diffrn_measurement_device_type  'STOE IPDS-2T'
_diffrn_measurement_method       'rotation method'
_diffrn_radiation_collimation    '0.5 mm diameter, monocapillary'
_diffrn_radiation_monochromator  'plane graphite'
_diffrn_radiation_polarisn_norm  0
_diffrn_radiation_type           MoK\a
_diffrn_radiation_wavelength     0.71073
_diffrn_reflns_av_R_equivalents  0.0382
_diffrn_reflns_av_unetI/netI     0.0410
_diffrn_reflns_limit_h_max       7
_diffrn_reflns_limit_h_min       -7
_diffrn_reflns_limit_k_max       22
_diffrn_reflns_limit_k_min       -22
_diffrn_reflns_limit_l_max       10
_diffrn_reflns_limit_l_min       -10
_diffrn_reflns_number            5835
_diffrn_reflns_theta_full        26.00
_diffrn_reflns_theta_max         27.98
_diffrn_reflns_theta_min         2.92
_diffrn_source
'sealed X-ray tube, 12 x 0.4 mm long-fine focus'
_diffrn_source_current           40
_diffrn_source_power             2.00
_diffrn_source_voltage           50
_exptl_absorpt_coefficient_mu    5.771
_exptl_absorpt_correction_T_max  0.4121
_exptl_absorpt_correction_T_min  0.2745
_exptl_absorpt_correction_type   integration
_exptl_absorpt_process_details   'STOE XRed 1.35'
_exptl_crystal_colour            'clear orangish red'
_exptl_crystal_colour_lustre     clear
_exptl_crystal_colour_modifier   orangish
_exptl_crystal_colour_primary    red
_exptl_crystal_density_diffrn    1.840
_exptl_crystal_density_method    'not measured'
_exptl_crystal_description       needle
_exptl_crystal_F_000             380
_exptl_crystal_size_max          0.25
_exptl_crystal_size_mid          0.1
_exptl_crystal_size_min          0.06
_refine_diff_density_max         0.418
_refine_diff_density_min         -0.321
_refine_diff_density_rms         0.074
_refine_ls_extinction_method     none
_refine_ls_goodness_of_fit_ref   0.840
_refine_ls_hydrogen_treatment    constr
_refine_ls_matrix_type           full
_refine_ls_number_parameters     92
_refine_ls_number_reflns         1673
_refine_ls_number_restraints     0
_refine_ls_restrained_S_all      0.840
_refine_ls_R_factor_all          0.0461
_refine_ls_R_factor_gt           0.0231
_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^)+(0.0289P)^2^+0.0000P] where P=(Fo^2^+2Fc^2^)/3'
_refine_ls_weighting_scheme      calc
_refine_ls_wR_factor_gt          0.0494
_refine_ls_wR_factor_ref         0.0525
_reflns_number_gt                1119
_reflns_number_total             1673
_reflns_threshold_expression     >2sigma(I)
_cod_data_source_file            c6qo00487c2.cif
_cod_data_source_block           3613
_cod_database_code               1553547
_olex2_refinement_description
;
1. Fixed Uiso
 At 1.2 times of:
  All C(H) groups
 At 1.5 times of:
  All C(H,H,H) groups
2.a Aromatic/amide H refined with riding coordinates:
 C3(H3), C2(H2), C6(H6)
2.b Idealised Me refined as rotating group:
 C9(H9A,H9B,H9C)
;
_olex2_submission_special_instructions 'No special instructions were received'