[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_1574227
_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                93.24(2)
_cell_angle_beta                 99.84(2)
_cell_angle_gamma                113.19(3)
_cell_formula_units_Z            1
_cell_length_a                   10.747(2)
_cell_length_b                   13.208(3)
_cell_length_c                   14.680(3)
_cell_measurement_reflns_used    24922
_cell_measurement_temperature    80(2)
_cell_measurement_theta_max      53.5130
_cell_measurement_theta_min      2.1000
_cell_volume                     1869.5(8)
_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      80(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 1.000
_diffrn_measured_fraction_theta_max 0.971
_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     13.00  39.00   0.50    0.70    --    0.05  60.00  14.80   52
  2  \w      0.00  26.00   0.50    0.70    --    0.05  88.00 122.26   52
  3  \w     15.00  40.00   0.50    0.70    --    0.05  50.00  89.09   50
  4  \w     -2.00  23.00   0.50    0.70    --    0.05  90.00-114.52   50
  5  \w    -43.00 -18.00   0.50    0.70    --    0.05 -42.00 149.08   50
  6  \w     13.00  38.00   0.50    0.70    --    0.05  61.00  93.37   50
  7  \w     15.00  41.00   0.50    0.70    --    0.05  52.00-135.47   52
  8  \w    -14.00  14.00   0.50    0.70    --   28.00 -46.00 146.81   56
  9  \w    -13.00  14.00   0.50    0.70    --   28.00 -46.00-136.35   54
 10  \w    -10.00  15.00   0.50    0.70    --   32.00 -47.00 -66.47   50
 11  \w    -11.00  14.00   0.50    0.70    --   32.00 -39.00 -13.99   50
 12  \w    -10.00  18.00   0.50    0.70    --   32.00 -47.00-104.49   56
 13  \w    -10.00  15.00   0.50    0.70    --   32.00 -48.00  33.70   50
 14  \w     -5.00  22.00   0.50    0.70    --   36.00 -47.00  56.41   54
 15  \w     -2.00  23.00   0.50    0.70    --   36.00 -57.00 -44.56   50
 16  \w     -5.00  20.00   0.50    0.70    --   36.00 -50.00-166.60   50
 17  \w     -1.00  24.00   0.50    0.70    --   40.00 -48.00  88.74   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      -0.0098712000
_diffrn_orient_matrix_UB_12      0.0172082000
_diffrn_orient_matrix_UB_13      0.0438510000
_diffrn_orient_matrix_UB_21      0.0443871000
_diffrn_orient_matrix_UB_22      -0.0230498000
_diffrn_orient_matrix_UB_23      0.0227403000
_diffrn_orient_matrix_UB_31      0.0576775000
_diffrn_orient_matrix_UB_32      0.0514886000
_diffrn_orient_matrix_UB_33      0.0032762000
_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  0.0257
_diffrn_reflns_av_unetI/netI     0.0319
_diffrn_reflns_Laue_measured_fraction_full 1.000
_diffrn_reflns_Laue_measured_fraction_max 0.971
_diffrn_reflns_limit_h_max       16
_diffrn_reflns_limit_h_min       -15
_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            36399
_diffrn_reflns_point_group_measured_fraction_full 1.000
_diffrn_reflns_point_group_measured_fraction_max 0.971
_diffrn_reflns_theta_full        25.242
_diffrn_reflns_theta_max         31.999
_diffrn_reflns_theta_min         2.057
_diffrn_source                   'Rotating-anode X-ray tube'
_diffrn_source_type              'Rigaku (Mo) X-ray Source'
_exptl_absorpt_coefficient_mu    0.306
_exptl_absorpt_correction_T_max  1.000
_exptl_absorpt_correction_T_min  0.615
_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    1.566
_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         0.472
_refine_diff_density_min         -0.304
_refine_diff_density_rms         0.063
_refine_ls_extinction_method     none
_refine_ls_goodness_of_fit_ref   1.036
_refine_ls_hydrogen_treatment    constr
_refine_ls_matrix_type           full
_refine_ls_number_parameters     567
_refine_ls_number_reflns         12575
_refine_ls_number_restraints     0
_refine_ls_restrained_S_all      1.036
_refine_ls_R_factor_all          0.0463
_refine_ls_R_factor_gt           0.0371
_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^+0.5991P] where P=(Fo^2^+2Fc^2^)/3'
_refine_ls_weighting_scheme      calc
_refine_ls_wR_factor_gt          0.0922
_refine_ls_wR_factor_ref         0.0964
_reflns_Friedel_coverage         0.000
_reflns_number_gt                10619
_reflns_number_total             12575
_reflns_threshold_expression     'I > 2\s(I)'
_cod_data_source_file            d4sc05587j10.cif
_cod_data_source_block           206b46v_80
_cod_depositor_comments
'Adding full bibliography for 1574226--1574232.cif.'
_cod_original_cell_volume        1869.44(6)
_cod_database_code               1574227
_shelx_shelxl_version_number     2018/3
_chemical_oxdiff_formula         C74H60B2F8FeN28O12
_shelx_estimated_absorpt_t_max   0.978
_shelx_estimated_absorpt_t_min   0.859
_reflns_odcompleteness_completeness 99.93
_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.a Ternary CH refined with riding coordinates:
 C2(H2), C3(H3), C13(H13), C14(H14)
2.b Secondary CH2 refined with riding coordinates:
 C10(H10B,H10A), C21(H21B,H21A), C32(H32B,H32A)
2.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)
2.d Idealised Me refined as rotating group:
 C34(H34A,H34B,H34C), C36(H36C,H36B,H36A)
;
_shelx_res_checksum              5296
_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 1.448
_oxdiff_exptl_absorpt_empirical_full_min 0.715