High brightness in bis(tri-isopropylsilyl)ethynyl-functionalized polycyclic aromatic hydrocarbons: localized representation <i>versus</i> Clar's model.
Dhbaibi, Kais; Le Thi, Huong; Marrot, Jérôme; Hayakawa, Masahiro; Mamada, Masashi; Frigoli, Michel; Chemical science 17 (2026) 6653–6661; doi:10.1039/d5sc09423b

data_1576487
_publ_section_title
;
 High brightness in bis(tri-isopropylsilyl)ethynyl-functionalized
 polycyclic aromatic hydrocarbons: localized representation <i>versus</i>
 Clar's model.
;
_journal_issue                   13
_journal_name_full               'Chemical science'
_journal_page_first              6653
_journal_page_last               6661
_journal_paper_doi               10.1039/d5sc09423b
_journal_volume                  17
_journal_year                    2026
_chemical_formula_moiety         'C60 H60 Si2'
_chemical_formula_sum            'C60 H60 Si2'
_chemical_formula_weight         837.26
_space_group_crystal_system      monoclinic
_space_group_IT_number           15
_space_group_name_Hall           '-C 2yc'
_space_group_name_H-M_alt        'C 1 2/c 1'
_atom_sites_solution_hydrogens   geom
_atom_sites_solution_primary     dual
_audit_creation_date             2025-11-18
_audit_creation_method
;
Olex2 1.5
(compiled 2025.07.13 svn.rb7424aed for OlexSys, GUI svn.r7314)
;
_audit_update_record
;
2025-11-19 deposited with the CCDC.	2026-02-02 downloaded from the CCDC.
;
_cell_angle_alpha                90
_cell_angle_beta                 94.361(2)
_cell_angle_gamma                90
_cell_formula_units_Z            4
_cell_length_a                   28.6941(14)
_cell_length_b                   17.8984(9)
_cell_length_c                   9.3498(5)
_cell_measurement_reflns_used    9990
_cell_measurement_temperature    200.00
_cell_measurement_theta_max      26.91
_cell_measurement_theta_min      2.42
_cell_volume                     4788.0(4)
_computing_cell_refinement       'SAINT V8.40B (?, 2016)'
_computing_data_reduction        'SAINT V8.40B (?, 2016)'
_computing_molecular_graphics    'Olex2 1.5 (Dolomanov et al., 2009)'
_computing_publication_material  'Olex2 1.5 (Dolomanov et al., 2009)'
_computing_structure_refinement  'SHELXL 2019/3 (Sheldrick, 2015)'
_computing_structure_solution    'SHELXT 2018/2 (Sheldrick, 2018)'
_diffrn_ambient_temperature      200.00
_diffrn_measured_fraction_theta_full 0.997
_diffrn_measured_fraction_theta_max 0.996
_diffrn_measurement_device_type  'D8 VENTURE'
_diffrn_measurement_method       '\f and \w scans'
_diffrn_radiation_type           MoK\a
_diffrn_radiation_wavelength     0.71073
_diffrn_reflns_av_R_equivalents  0.1378
_diffrn_reflns_av_unetI/netI     0.0426
_diffrn_reflns_Laue_measured_fraction_full 0.997
_diffrn_reflns_Laue_measured_fraction_max 0.996
_diffrn_reflns_limit_h_max       37
_diffrn_reflns_limit_h_min       -37
_diffrn_reflns_limit_k_max       23
_diffrn_reflns_limit_k_min       -23
_diffrn_reflns_limit_l_max       12
_diffrn_reflns_limit_l_min       -12
_diffrn_reflns_number            113948
_diffrn_reflns_point_group_measured_fraction_full 0.997
_diffrn_reflns_point_group_measured_fraction_max 0.996
_diffrn_reflns_theta_full        25.242
_diffrn_reflns_theta_max         27.537
_diffrn_reflns_theta_min         2.420
_diffrn_source_current           1.0
_diffrn_source_power             0.05
_diffrn_source_voltage           50.0
_diffrn_standards_number         0
_exptl_absorpt_coefficient_mu    0.113
_exptl_absorpt_correction_T_max  0.7371
_exptl_absorpt_correction_T_min  0.6676
_exptl_absorpt_correction_type   multi-scan
_exptl_absorpt_process_details
;
SADABS-2016/2 (Bruker,2016/2) was used for absorption correction.
wR2(int) was 0.1741 before and 0.0988 after correction.
The Ratio of minimum to maximum transmission is 0.9057.
The \l/2 correction factor is Not present.
;
_exptl_crystal_colour            blue
_exptl_crystal_colour_primary    blue
_exptl_crystal_density_diffrn    1.161
_exptl_crystal_description       needle
_exptl_crystal_F_000             1792
_exptl_crystal_size_max          0.3
_exptl_crystal_size_mid          0.04
_exptl_crystal_size_min          0.02
_refine_diff_density_max         0.521
_refine_diff_density_min         -0.310
_refine_diff_density_rms         0.047
_refine_ls_extinction_method     none
_refine_ls_goodness_of_fit_ref   1.045
_refine_ls_hydrogen_treatment    constr
_refine_ls_matrix_type           full
_refine_ls_number_parameters     286
_refine_ls_number_reflns         5503
_refine_ls_number_restraints     0
_refine_ls_restrained_S_all      1.045
_refine_ls_R_factor_all          0.0897
_refine_ls_R_factor_gt           0.0565
_refine_ls_shift/su_max          0.001
_refine_ls_shift/su_mean         0.000
_refine_ls_structure_factor_coef Fsqd
_refine_ls_weighting_details
'w=1/[\s^2^(Fo^2^)+(0.0663P)^2^+5.3745P] where P=(Fo^2^+2Fc^2^)/3'
_refine_ls_weighting_scheme      calc
_refine_ls_wR_factor_gt          0.1402
_refine_ls_wR_factor_ref         0.1649
_reflns_Friedel_coverage         0.000
_reflns_number_gt                3783
_reflns_number_total             5503
_reflns_threshold_expression     'I > 2\s(I)'
_cod_data_source_file            d5sc09423b2.cif
_cod_data_source_block           TIPS-DBPYR
_cod_depositor_comments
'Adding full bibliography for 1576486--1576488.cif.'
_cod_original_sg_symbol_H-M      C2/c
_cod_database_code               1576487
_shelx_shelxl_version_number     2019/3
_shelx_estimated_absorpt_t_max   0.998
_shelx_estimated_absorpt_t_min   0.967
_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 Ternary CH refined with riding coordinates:
 C22(H22), C25(H25), C28(H28)
2.b Aromatic/amide H refined with riding coordinates:
 C1(H1), C3(H3), C4(H4), C5(H5), C6(H6), C8(H8), C15(H15), C18(H18), C19(H19)
2.c Idealised Me refined as rotating group:
 C23(H23A,H23B,H23C), C24(H24A,H24B,H24C), C26(H26A,H26B,H26C), C27(H27A,H27B,
 H27C), C29(H29A,H29B,H29C), C30(H30A,H30B,H30C)
;
_shelx_res_checksum              95893
_olex2_submission_special_instructions 'No special instructions were received'