[2 + 2] Photocyclization converts thermally induced spin crossover effect into “hidden hysteresis” one
Kaźmierczak, Marcin; Weselski, Marek; Siczek, Miłosz; Wolny, Juliusz A.; Schünemann, Volker; Bronisz, Robert; Chemical Science 16 (2025) 7884–7893; doi:10.1039/D4SC05587J

data_1574230
_publ_section_title
;
 [2 + 2] Photocyclization converts thermally induced spin crossover effect
 into &#x201C;hidden hysteresis&#x201D; one
;
_journal_issue                   18
_journal_name_full               'Chemical Science'
_journal_page_first              7884
_journal_page_last               7893
_journal_paper_doi               10.1039/D4SC05587J
_journal_volume                  16
_journal_year                    2025
_chemical_formula_moiety         'C66 H48 Fe N24 O12, 2(B F4), 4(C2 H3 N)'
_chemical_formula_sum            'C74 H60 B2 F8 Fe N28 O12'
_chemical_formula_weight         1762.97
_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             2024-04-19
_audit_creation_method
;
Olex2 1.5
(compiled 2023.08.24 svn.re1ec1418 for OlexSys, GUI svn.r6817)
;
_audit_update_record
;
2024-06-13 deposited with the CCDC.	2025-03-25 downloaded from the CCDC.
;
_cell_angle_alpha                93.25(2)
_cell_angle_beta                 99.70(2)
_cell_angle_gamma                112.47(3)
_cell_formula_units_Z            1
_cell_length_a                   10.816(3)
_cell_length_b                   13.308(4)
_cell_length_c                   14.753(4)
_cell_measurement_reflns_used    21335
_cell_measurement_temperature    250(2)
_cell_measurement_theta_max      49.2520
_cell_measurement_theta_min      2.1020
_cell_volume                     1917.1(11)
_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  'SHELXL 2018/3 (Sheldrick, 2015)'
_diffrn_ambient_environment      N~2~
_diffrn_ambient_temperature      250(2)
_diffrn_detector                 'Hybrid Pixel Array Detector'
_diffrn_detector_area_resol_mean 10.0000
_diffrn_detector_type            'HyPix-Arc 150'
_diffrn_measured_fraction_theta_full 0.999
_diffrn_measured_fraction_theta_max 0.980
_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     -8.00  18.00   0.50    1.20    --   32.00 -47.00-117.13   52
  2  \w     -9.00  18.00   0.50    1.20    --   32.00 -47.00 -51.46   54
  3  \w    -10.00  15.00   0.50    1.20    --   32.00 -46.00  -8.85   50
  4  \w     -2.00  23.00   0.50    1.20    --   40.00 -46.00  35.94   50
  5  \w    -10.00  15.00   0.50    1.20    --   32.00 -46.00  82.39   50
  6  \w     -9.00  18.00   0.50    1.20    --   32.00 -47.00 154.18   54
  7  \w     -8.00  18.00   0.50    1.20    --   32.00 -46.00 103.87   52
  8  \w    -11.00  14.00   0.50    1.20    --   32.00 -39.00  18.76   50
  9  \w     17.00  42.00   0.50    1.20    --    0.05  39.00 -80.25   50
 10  \w     13.00  38.00   0.50    1.20    --    0.05  60.00-117.99   50
 11  \w     13.00  39.00   0.50    1.20    --    0.05  58.00-148.19   52
 12  \w     15.00  41.00   0.50    1.20    --    0.05  50.00-163.90   52
 13  \w     14.00  39.00   0.50    1.20    --    0.05  47.00 -82.23   50
 14  \w     17.00  43.00   0.50    1.20    --    0.05  41.00 154.78   52
 15  \w      0.00  25.00   0.50    1.20    --    0.05  87.00  47.24   50
 16  \w      0.00  26.00   0.50    1.20    --    0.05  87.00 -35.18   52
 17  \w      0.00  25.00   0.50    1.20    --    0.05  87.00 -79.45   50
;
_diffrn_measurement_device       'four-circle diffractometer'
_diffrn_measurement_device_type  'XtaLAB Synergy R, DW system, HyPix-Arc 150'
_diffrn_measurement_method       '\w scans'
_diffrn_orient_matrix_type
'CrysAlisPro convention (1999,Acta A55,543-557)'
_diffrn_orient_matrix_UB_11      -0.0092662000
_diffrn_orient_matrix_UB_12      0.0173661000
_diffrn_orient_matrix_UB_13      0.0437759000
_diffrn_orient_matrix_UB_21      0.0440495000
_diffrn_orient_matrix_UB_22      -0.0232958000
_diffrn_orient_matrix_UB_23      0.0223146000
_diffrn_orient_matrix_UB_31      0.0568578000
_diffrn_orient_matrix_UB_32      0.0504187000
_diffrn_orient_matrix_UB_33      0.0027853000
_diffrn_radiation_monochromator  mirror
_diffrn_radiation_probe          x-ray
_diffrn_radiation_type           'Mo K\a'
_diffrn_radiation_wavelength     0.71073
_diffrn_reflns_av_R_equivalents  0.0248
_diffrn_reflns_av_unetI/netI     0.0317
_diffrn_reflns_Laue_measured_fraction_full 0.999
_diffrn_reflns_Laue_measured_fraction_max 0.980
_diffrn_reflns_limit_h_max       16
_diffrn_reflns_limit_h_min       -16
_diffrn_reflns_limit_k_max       19
_diffrn_reflns_limit_k_min       -19
_diffrn_reflns_limit_l_max       21
_diffrn_reflns_limit_l_min       -21
_diffrn_reflns_number            38314
_diffrn_reflns_point_group_measured_fraction_full 0.999
_diffrn_reflns_point_group_measured_fraction_max 0.980
_diffrn_reflns_theta_full        25.242
_diffrn_reflns_theta_max         31.998
_diffrn_reflns_theta_min         2.088
_diffrn_source                   'Rotating-anode X-ray tube'
_diffrn_source_type              'Rigaku (Mo) X-ray Source'
_exptl_absorpt_coefficient_mu    0.299
_exptl_absorpt_correction_T_max  1.000
_exptl_absorpt_correction_T_min  0.599
_exptl_absorpt_correction_type   gaussian
_exptl_absorpt_process_details
;
CrysAlisPro 1.171.42.49 (Rigaku Oxford Diffraction, 2022)
Numerical absorption correction based on gaussian integration over
a multifaceted crystal model
Empirical absorption correction using spherical harmonics,
implemented in SCALE3 ABSPACK scaling algorithm.
;
_exptl_crystal_colour            colourless
_exptl_crystal_density_diffrn    1.527
_exptl_crystal_description       plate
_exptl_crystal_F_000             904
_exptl_crystal_size_max          0.511
_exptl_crystal_size_mid          0.312
_exptl_crystal_size_min          0.072
_refine_diff_density_max         0.304
_refine_diff_density_min         -0.272
_refine_diff_density_rms         0.044
_refine_ls_extinction_method     none
_refine_ls_goodness_of_fit_ref   1.041
_refine_ls_hydrogen_treatment    constr
_refine_ls_matrix_type           full
_refine_ls_number_parameters     595
_refine_ls_number_reflns         13027
_refine_ls_number_restraints     0
_refine_ls_restrained_S_all      1.041
_refine_ls_R_factor_all          0.0571
_refine_ls_R_factor_gt           0.0410
_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^)+(0.0466P)^2^+0.3419P] where P=(Fo^2^+2Fc^2^)/3'
_refine_ls_weighting_scheme      calc
_refine_ls_wR_factor_gt          0.0989
_refine_ls_wR_factor_ref         0.1053
_reflns_Friedel_coverage         0.000
_reflns_number_gt                10176
_reflns_number_total             13027
_reflns_threshold_expression     'I > 2\s(I)'
_cod_data_source_file            d4sc05587j10.cif
_cod_data_source_block           206b46v_250
_cod_depositor_comments
'Adding full bibliography for 1574226--1574232.cif.'
_cod_original_cell_volume        1917.18(8)
_cod_database_code               1574230
_shelx_shelxl_version_number     2018/3
_chemical_oxdiff_formula         C74H60B2F8FeN28O12
_shelx_estimated_absorpt_t_max   0.979
_shelx_estimated_absorpt_t_min   0.862
_reflns_odcompleteness_completeness 99.94
_reflns_odcompleteness_iscentric 1
_reflns_odcompleteness_theta     26.32
_olex2_refinement_description
;
1. Fixed Uiso
 At 1.2 times of:
  All C(H) groups, All C(H,H) groups
 At 1.5 times of:
  All C(H,H,H) groups
2. Others
 Sof(F3A)=Sof(F4A)=Sof(F2A)=1-FVAR(1)
 Sof(F2)=Sof(F3)=Sof(F4)=FVAR(1)
3.a Ternary CH refined with riding coordinates:
 C2(H2), C3(H3), C13(H13), C14(H14)
3.b Secondary CH2 refined with riding coordinates:
 C10(H10B,H10A), C21(H21B,H21A), C32(H32B,H32A)
3.c Aromatic/amide H refined with riding coordinates:
 C5(H5), C6(H6), C8(H8), C11(H11), C16(H16), C17(H17), C19(H19), C22(H22),
 C24(H24), C25(H25), C27(H27), C28(H28), C30(H30), C33(H33)
3.d Idealised Me refined as rotating group:
 C34(H34A,H34B,H34C), C36(H36C,H36B,H36A)
;
_shelx_res_checksum              31275
_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 1.715
_oxdiff_exptl_absorpt_empirical_full_min 0.693