Structural transformations and stability of benzo[a]pyrene under high pressure.
Zhou, Wenju; Aslandukov, Andrey; Minchenkova, Anastasiia; Hanfland, Michael; Dubrovinsky, Leonid; Dubrovinskaia, Natalia; IUCrJ 12 (2025) –; doi:10.1107/S2052252524010455

data_1573195
_publ_section_title
;
 Structural transformations and stability of benzo[a]pyrene under high
 pressure.
;
_journal_issue                   1
_journal_name_full               IUCrJ
_journal_paper_doi               10.1107/S2052252524010455
_journal_volume                  12
_journal_year                    2025
_chemical_formula_moiety         'C20 H12'
_chemical_formula_sum            'C20 H12'
_chemical_formula_weight         252.30
_space_group_crystal_system      triclinic
_space_group_IT_number           2
_space_group_name_Hall           '-P 1'
_space_group_name_H-M_alt        'P -1'
_atom_sites_solution_hydrogens   geom
_audit_creation_date             2024-08-18
_audit_creation_method
;
Olex2 1.5
(compiled 2024.02.16 svn.r378c4104 for OlexSys, GUI svn.r6928)
;
_cell_angle_alpha                91.51(2)
_cell_angle_beta                 90.434(9)
_cell_angle_gamma                95.820(8)
_cell_formula_units_Z            4
_cell_length_a                   3.49120(10)
_cell_length_b                   12.687(3)
_cell_length_c                   21.531(6)
_cell_measurement_reflns_used    373
_cell_measurement_temperature    293(2)
_cell_measurement_theta_max      18.7840
_cell_measurement_theta_min      3.4210
_cell_volume                     948.4(3)
_computing_cell_refinement       'CrysAlisPro 1.171.42.49 (Rigaku OD, 2022)'
_computing_data_collection       'CrysAlisPro 1.171.42.49 (Rigaku OD, 2022)'
_computing_data_reduction        'CrysAlisPro 1.171.42.49 (Rigaku OD, 2022)'
_computing_molecular_graphics    'Olex2 1.5 (Dolomanov et al., 2009)'
_computing_publication_material  'Olex2 1.5 (Dolomanov et al., 2009)'
_computing_structure_refinement  'XL  (Sheldrick, 2008)'
_computing_structure_solution    'SHELXT 2014/5 (Sheldrick, 2014)'
_diffrn_ambient_temperature      293(2)
_diffrn_detector_area_resol_mean 13.3333
_diffrn_measured_fraction_theta_full 0.271
_diffrn_measured_fraction_theta_max 0.145
_diffrn_measurement_details
;
List of Runs (angles in degrees, time in seconds):

  # Type    Start    End  Width  t~exp~   \w     \q     \k     \f   Frames
--------------------------------------------------------------------------
  1  \w    -32.00  32.50   0.50    1.00    --    0.00   0.00   0.00  129
;
_diffrn_measurement_device       'abstract diffractometer'
_diffrn_measurement_device_type
'esperanto-CrysAlisPro-abstract goniometer imported esperanto images'
_diffrn_measurement_method       '\w scans'
_diffrn_radiation_type           synchrotron
_diffrn_radiation_wavelength     0.410
_diffrn_reflns_av_R_equivalents  0.0312
_diffrn_reflns_av_unetI/netI     0.0735
_diffrn_reflns_Laue_measured_fraction_full 0.271
_diffrn_reflns_Laue_measured_fraction_max 0.145
_diffrn_reflns_limit_h_max       4
_diffrn_reflns_limit_h_min       -4
_diffrn_reflns_limit_k_max       16
_diffrn_reflns_limit_k_min       -15
_diffrn_reflns_limit_l_max       21
_diffrn_reflns_limit_l_min       -16
_diffrn_reflns_number            2260
_diffrn_reflns_point_group_measured_fraction_full 0.271
_diffrn_reflns_point_group_measured_fraction_max 0.145
_diffrn_reflns_theta_full        14.241
_diffrn_reflns_theta_max         20.990
_diffrn_reflns_theta_min         3.384
_diffrn_source                   synchrotron
_exptl_absorpt_coefficient_mu    0.046
_exptl_absorpt_correction_T_max  1.00000
_exptl_absorpt_correction_T_min  0.16346
_exptl_absorpt_correction_type   multi-scan
_exptl_absorpt_process_details
;
CrysAlisPro 1.171.42.49 (Rigaku Oxford Diffraction, 2022)
Empirical absorption correction using spherical harmonics,
implemented in SCALE3 ABSPACK scaling algorithm.
;
_exptl_crystal_colour            'clear colourless'
_exptl_crystal_colour_lustre     clear
_exptl_crystal_colour_primary    colourless
_exptl_crystal_density_diffrn    1.767
_exptl_crystal_description       block
_exptl_crystal_F_000             528
_exptl_crystal_size_max          0.023
_exptl_crystal_size_mid          0.021
_exptl_crystal_size_min          0.018
_refine_diff_density_max         0.202
_refine_diff_density_min         -0.149
_refine_diff_density_rms         0.043
_refine_ls_extinction_method     none
_refine_ls_goodness_of_fit_ref   0.957
_refine_ls_hydrogen_treatment    constr
_refine_ls_matrix_type           full
_refine_ls_number_parameters     361
_refine_ls_number_reflns         1531
_refine_ls_number_restraints     66
_refine_ls_restrained_S_all      0.942
_refine_ls_R_factor_all          0.1058
_refine_ls_R_factor_gt           0.0628
_refine_ls_shift/su_max          0.000
_refine_ls_shift/su_mean         0.000
_refine_ls_structure_factor_coef Fsqd
_refine_ls_weighting_details
'w=1/[\s^2^(Fo^2^)+(0.0973P)^2^] where P=(Fo^2^+2Fc^2^)/3'
_refine_ls_weighting_scheme      calc
_refine_ls_wR_factor_gt          0.1419
_refine_ls_wR_factor_ref         0.1645
_reflns_Friedel_coverage         0.000
_reflns_number_gt                867
_reflns_number_total             1531
_reflns_threshold_expression     'I > 2\s(I)'
_cod_data_source_file            lq5058.cif
_cod_data_source_block           benzoapyrene_7.1GPa
_cod_database_code               1573195
_shelx_shelxl_version_number     2017/1
_shelx_estimated_absorpt_t_max   0.999
_shelx_estimated_absorpt_t_min   0.999
_olex2_refinement_description
;
1. Fixed Uiso
 At 1.2 times of:
  All C(H) groups
2. Uiso/Uaniso restraints and constraints
Uanis(C31) \\sim Ueq, Uanis(C63) \\sim Ueq, Uanis(C75) \\sim Ueq, Uanis(C47)
\\sim Ueq, Uanis(C65) \\sim Ueq, Uanis(C43) \\sim Ueq, Uanis(C11) \\sim Ueq,
Uanis(C51) \\sim Ueq, Uanis(C5) \\sim Ueq, Uanis(C3) \\sim Ueq: with sigma of
0.01 and sigma for terminal atoms of 0.02
Uanis(C25) \\sim Ueq: with sigma of 0.02 and sigma for terminal atoms of 0.04
3.a Aromatic/amide H refined with riding coordinates:
 C13(H13), C15(H15), C21(H21), C23(H23), C25(H25), C27(H27), C37(H37),
 C47(H47), C55(H55), C79(H79), C53(H53), C67(H67), C63(H63), C43(H43), C57(H57),
  C39(H39), C41(H41), C45(H45), C59(H59), C61(H61), C65(H65), C69(H69),
 C71(H71), C77(H77)
;
_shelx_res_checksum              52105
_shelx_hkl_checksum              96068
_olex2_submission_special_instructions 'No special instructions were received'
_oxdiff_exptl_absorpt_empirical_details
;
Empirical correction (ABSPACK) includes:
- Absorption correction using spherical harmonics
- Frame scaling
- Detector area scaling
;