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_1573192
_publ_section_title
;
 Structural transformations and stability of benzo[a]pyrene under high
 pressure.
;
_journal_coeditor_code           LQ5058
_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      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   geom
_audit_creation_date             2024-08-20
_audit_creation_method
;
Olex2 1.5
(compiled 2024.02.16 svn.r378c4104 for OlexSys, GUI svn.r6928)
;
_cell_angle_alpha                90
_cell_angle_beta                 97.006(8)
_cell_angle_gamma                90
_cell_formula_units_Z            4
_cell_length_a                   4.5384(3)
_cell_length_b                   20.439(5)
_cell_length_c                   13.531(2)
_cell_measurement_reflns_used    302
_cell_measurement_temperature    293(2)
_cell_measurement_theta_max      14.9710
_cell_measurement_theta_min      2.6040
_cell_volume                     1245.8(4)
_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 0.459
_diffrn_measured_fraction_theta_max 0.248
_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  0.0350
_diffrn_reflns_av_unetI/netI     0.0759
_diffrn_reflns_Laue_measured_fraction_full 0.459
_diffrn_reflns_Laue_measured_fraction_max 0.248
_diffrn_reflns_limit_h_max       7
_diffrn_reflns_limit_h_min       -7
_diffrn_reflns_limit_k_max       18
_diffrn_reflns_limit_k_min       -22
_diffrn_reflns_limit_l_max       18
_diffrn_reflns_limit_l_min       -19
_diffrn_reflns_number            3094
_diffrn_reflns_point_group_measured_fraction_full 0.459
_diffrn_reflns_point_group_measured_fraction_max 0.248
_diffrn_reflns_theta_full        14.241
_diffrn_reflns_theta_max         21.630
_diffrn_reflns_theta_min         2.608
_diffrn_source                   synchrotron
_exptl_absorpt_coefficient_mu    0.035
_exptl_absorpt_correction_T_max  1.00000
_exptl_absorpt_correction_T_min  0.29627
_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    1.345
_exptl_crystal_description       block
_exptl_crystal_F_000             528
_exptl_crystal_size_max          0.01
_exptl_crystal_size_mid          0.01
_exptl_crystal_size_min          0.01
_refine_diff_density_max         0.082
_refine_diff_density_min         -0.095
_refine_diff_density_rms         0.020
_refine_ls_extinction_method     none
_refine_ls_goodness_of_fit_ref   0.901
_refine_ls_hydrogen_treatment    constr
_refine_ls_matrix_type           full
_refine_ls_number_parameters     181
_refine_ls_number_reflns         1877
_refine_ls_number_restraints     0
_refine_ls_restrained_S_all      0.901
_refine_ls_R_factor_all          0.1725
_refine_ls_R_factor_gt           0.0598
_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^)+(0.0949P)^2^] where P=(Fo^2^+2Fc^2^)/3'
_refine_ls_weighting_scheme      calc
_refine_ls_wR_factor_gt          0.1446
_refine_ls_wR_factor_ref         0.1958
_reflns_Friedel_coverage         0.000
_reflns_number_gt                661
_reflns_number_total             1877
_reflns_threshold_expression     'I > 2\s(I)'
_cod_data_source_file            lq5058.cif
_cod_data_source_block           benzoapyrene_0GPa
_cod_database_code               1573192
_shelx_shelxl_version_number     2017/1
_shelx_estimated_absorpt_t_max   1.000
_shelx_estimated_absorpt_t_min   1.000
_olex2_refinement_description
;
1. Fixed Uiso
 At 1.2 times of:
  All C(H) groups
2.a Aromatic/amide H refined with riding coordinates:
 C001(H001), C002(H002), C006(H006), C00B(H00B), C00C(H00C), C00E(H00E),
 C00F(H00F), C00G(H00G), C00H(H00H), C00I(H00I), C00J(H00J), C00K(H00K)
;
_shelx_res_checksum              49627
_shelx_hkl_checksum              27553
_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
;