Planarisation or a twist? Using steric engineering to unlock the origin of mechanofluorochromic red-shifts.
McDonald, Peter W.; Goerigk, Lars; Ritchie, Chris; Chemical science 16 (2025) 15320–15332; doi:10.1039/d5sc04257g

data_1575178
_publ_section_title
;
 Planarisation or a twist? Using steric engineering to unlock the origin
 of mechanofluorochromic red-shifts.
;
_journal_issue                   34
_journal_name_full               'Chemical science'
_journal_page_first              15320
_journal_page_last               15332
_journal_paper_doi               10.1039/d5sc04257g
_journal_volume                  16
_journal_year                    2025
_chemical_formula_moiety         'C23 H16 F4 N2 O2'
_chemical_formula_sum            'C23 H16 F4 N2 O2'
_chemical_formula_weight         428.38
_chemical_name_systematic
2-(4-(diphenylamino)-3-methylpyridin-1-ium-1-yl)-4,4,5,5-tetrafluoro-3-oxocyclopent-1-en-1-olate
_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     dual
_audit_creation_date             2025-05-25
_audit_creation_method
;
Olex2 1.5
(compiled 2025.04.05 svn.rf049d14d for OlexSys, GUI svn.r7224)
;
_audit_update_record
;
2025-06-06 deposited with the CCDC.	2025-07-18 downloaded from the CCDC.
;
_cell_angle_alpha                90
_cell_angle_beta                 97.766(2)
_cell_angle_gamma                90
_cell_formula_units_Z            4
_cell_length_a                   15.3845(4)
_cell_length_b                   7.33100(15)
_cell_length_c                   17.2664(3)
_cell_measurement_reflns_used    7756
_cell_measurement_temperature    293
_cell_measurement_theta_max      79.5570
_cell_measurement_theta_min      3.5800
_cell_volume                     1929.51(7)
_computing_cell_refinement       'CrysAlisPro 1.171.42.70a (Rigaku OD, 2022)'
_computing_data_collection       'CrysAlisPro 1.171.42.70a (Rigaku OD, 2022)'
_computing_data_reduction        'CrysAlisPro 1.171.42.70a (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  'SHELXL 2019/3 (Sheldrick, 2015)'
_computing_structure_solution    'SHELXT  (Sheldrick, 2015)'
_diffrn_ambient_environment      air
_diffrn_ambient_temperature      293
_diffrn_detector                 'Hybrid Pixel Array Detector'
_diffrn_detector_area_resol_mean 10.0000
_diffrn_detector_type            HyPix
_diffrn_measured_fraction_theta_full 0.995
_diffrn_measured_fraction_theta_max 0.931
_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    -64.00  21.00   0.50    1.48    --  -48.16  59.00-112.00  170
  2  \w   -118.00 -66.00   0.50    1.48    --  -48.16 -59.00 107.00  104
  3  \w    -60.00 -34.00   0.50    1.48    --  -48.16 -59.00 107.00   52
  4  \w     -8.00  21.00   0.50    1.48    --   48.16 -59.00 107.00   58
  5  \w    -87.00 -62.00   0.50    8.00    --  -91.75  59.00-112.00   50
  6  \w   -144.00-119.00   0.50    8.00    --  -91.75 -59.00 107.00   50
  7  \w    110.00 174.00   0.50    8.00    --  113.25  59.00-112.00  128
  8  \w     56.00 126.00   0.50    8.00    --  113.25 -59.00 107.00  140
  9  \w   -113.00 -73.00   0.50    1.48    --  -48.16-125.00  30.00   80
 10  \w   -118.00 -74.00   0.50    1.48    --  -48.16-125.00-120.00   88
 11  \w     53.00  78.00   0.50    1.48    --   48.16  59.00-112.00   50
 12  \w     26.00  55.00   0.50    1.48    --   48.16 -59.00 107.00   58
 13  \w    -78.00 -20.00   0.50    8.00    --  -91.75  45.00  90.00  116
 14  \w     58.00 105.00   0.50    8.00    --  113.25 -94.00  30.00   94
 15  \w    100.00 126.00   0.50    8.00    --  113.25  15.00-150.00   52
 16  \w    138.00 178.00   0.50    8.00    --  113.25  30.00-180.00   80
 17  \w     42.00  73.00   0.50    8.00    --  113.25 -45.00  30.00   62
 18  \w    153.00 178.00   0.50    8.00    --  113.25  30.00-150.00   50
 19  \w    137.00 163.00   0.50    8.00    --  113.25  15.00-150.00   52
 20  \w     43.00  72.00   0.50    8.00    --  113.25 -45.00 -30.00   58
 21  \w    104.00 178.00   0.50    8.00    --  113.25  30.00 150.00  148
 22  \w     42.00  67.00   0.50    8.00    --  113.25 -45.00   0.00   50
 23  \w    110.00 136.00   0.50    8.00    --  113.25  30.00-180.00   52
 24  \w     42.00  71.00   0.50    8.00    --  113.25 -45.00  60.00   58
 25  \w     48.00  73.00   0.50    8.00    --  113.25 -45.00 -60.00   50
 26  \w    102.00 140.00   0.50    8.00    --  113.25  30.00-150.00   76
 27  \w     39.00  64.00   0.50    8.00    --  113.25 -30.00   0.00   50
 28  \w     47.00  74.00   0.50    8.00    --  113.25 -45.00 -90.00   54
 29  \w     39.00  66.00   0.50    8.00    --  113.25 -30.00-180.00   54
 30  \w     39.00  65.00   0.50    8.00    --  113.25 -30.00-120.00   52
 31  \w     45.00  76.00   0.50    8.00    --  113.25 -45.00-180.00   62
 32  \w     39.00  64.00   0.50    8.00    --  113.25 -30.00  90.00   50
 33  \w     81.00 106.00   0.50    8.00    --  113.25 -94.00 -30.00   50
 34  \w     41.00  66.00   0.50    8.00    --  113.25 -30.00 -90.00   50
;
_diffrn_measurement_device       'four-circle diffractometer'
_diffrn_measurement_device_type  'XtaLAB Synergy, Dualflex, HyPix'
_diffrn_measurement_method       '\w scans'
_diffrn_orient_matrix_type
'CrysAlisPro convention (1999,Acta A55,543-557)'
_diffrn_orient_matrix_UB_11      -0.0363638000
_diffrn_orient_matrix_UB_12      0.1431871000
_diffrn_orient_matrix_UB_13      -0.0612671000
_diffrn_orient_matrix_UB_21      -0.0904199000
_diffrn_orient_matrix_UB_22      -0.0124545000
_diffrn_orient_matrix_UB_23      0.0285789000
_diffrn_orient_matrix_UB_31      0.0266656000
_diffrn_orient_matrix_UB_32      0.1533300000
_diffrn_orient_matrix_UB_33      0.0595002000
_diffrn_radiation_monochromator  mirror
_diffrn_radiation_probe          x-ray
_diffrn_radiation_type           'Cu K\a'
_diffrn_radiation_wavelength     1.54184
_diffrn_reflns_av_R_equivalents  0.0358
_diffrn_reflns_av_unetI/netI     0.0322
_diffrn_reflns_Laue_measured_fraction_full 0.995
_diffrn_reflns_Laue_measured_fraction_max 0.931
_diffrn_reflns_limit_h_max       18
_diffrn_reflns_limit_h_min       -19
_diffrn_reflns_limit_k_max       9
_diffrn_reflns_limit_k_min       -5
_diffrn_reflns_limit_l_max       22
_diffrn_reflns_limit_l_min       -21
_diffrn_reflns_number            15284
_diffrn_reflns_point_group_measured_fraction_full 0.995
_diffrn_reflns_point_group_measured_fraction_max 0.931
_diffrn_reflns_theta_full        67.684
_diffrn_reflns_theta_max         88.305
_diffrn_reflns_theta_min         3.614
_diffrn_source                   'micro-focus sealed X-ray tube'
_diffrn_source_type              'PhotonJet (Cu) X-ray Source'
_exptl_absorpt_coefficient_mu    1.042
_exptl_absorpt_correction_T_max  1.00000
_exptl_absorpt_correction_T_min  0.86640
_exptl_absorpt_correction_type   multi-scan
_exptl_absorpt_process_details
;
CrysAlisPro 1.171.42.70a (Rigaku Oxford Diffraction, 2022)
Empirical absorption correction using spherical harmonics,
implemented in SCALE3 ABSPACK scaling algorithm.
;
_exptl_crystal_colour            'clear yellowish yellow'
_exptl_crystal_colour_lustre     clear
_exptl_crystal_colour_modifier   yellowish
_exptl_crystal_colour_primary    yellow
_exptl_crystal_density_diffrn    1.475
_exptl_crystal_description       irregular
_exptl_crystal_F_000             880
_exptl_crystal_preparation       oil
_exptl_crystal_recrystallization_method acetone
_exptl_crystal_size_max          0.1
_exptl_crystal_size_mid          0.08
_exptl_crystal_size_min          0.04
_refine_diff_density_max         0.338
_refine_diff_density_min         -0.432
_refine_diff_density_rms         0.047
_refine_ls_extinction_coef       0.0010(3)
_refine_ls_extinction_expression Fc^*^=kFc[1+0.001xFc^2^\l^3^/sin(2\q)]^-1/4^
_refine_ls_extinction_method     'SHELXL-2019/2 (Sheldrick 2019)'
_refine_ls_goodness_of_fit_ref   1.113
_refine_ls_hydrogen_treatment    constr
_refine_ls_matrix_type           full
_refine_ls_number_parameters     282
_refine_ls_number_reflns         4103
_refine_ls_number_restraints     0
_refine_ls_restrained_S_all      1.113
_refine_ls_R_factor_all          0.0633
_refine_ls_R_factor_gt           0.0525
_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^)+(0.0476P)^2^+1.5142P] where P=(Fo^2^+2Fc^2^)/3'
_refine_ls_weighting_scheme      calc
_refine_ls_wR_factor_gt          0.1384
_refine_ls_wR_factor_ref         0.1502
_reflns_Friedel_coverage         0.000
_reflns_number_gt                3480
_reflns_number_total             4103
_reflns_threshold_expression     'I > 2\s(I)'
_cod_data_source_file            d5sc04257g2.cif
_cod_data_source_block           pm2_164_293k_1_auto
_cod_depositor_comments
'Adding full bibliography for 1575172--1575185.cif.'
_cod_database_code               1575178
_shelx_shelxl_version_number     2019/3
_chemical_oxdiff_formula         C23H16F4N2O2
_chemical_oxdiff_usercomment     'collected at 293.8 K in cryo oil'
_shelx_estimated_absorpt_t_max   0.960
_shelx_estimated_absorpt_t_min   0.903
_diffrn_oxdiff_digest_hkl
;
01c7f5347ac1bd097c5670aaff972eaa0b2fb0
;
_reflns_odcompleteness_completeness 98.95
_reflns_odcompleteness_iscentric 1
_reflns_odcompleteness_theta     74.33
_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:
 C17(H17), C16(H16), C15(H15), C12(H12), C8(H8), C2(H2), C10(H10), C9(H9),
 C1(H1), C11(H11), C4(H4), C6(H6), C5(H5)
2.b Idealised Me refined as rotating group:
 C18(H18A,H18B,H18C)
;
_shelx_res_checksum              50891
_olex2_exptl_crystal_mounting_method oil
_olex2_submission_original_sample_id '3a 293 K'
_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
;
_oxdiff_exptl_absorpt_empirical_full_max 2.076
_oxdiff_exptl_absorpt_empirical_full_min 0.665