Spin-crossover iron(II) complexes featuring boronic acid and boronic ester groups: synthesis and magnetic properties
Zhang, Minghui; Heinemann, Frank; Khusniyarov, Marat M.; CrystEngComm  (2026) –; doi:10.1039/D6CE00062B

data_7251769
_publ_section_title
;
 Spin-crossover iron(ii) complexes featuring boronic acid and boronic
 ester groups: synthesis and magnetic properties
;
_journal_issue                   15
_journal_name_full               CrystEngComm
_journal_page_first              2355
_journal_page_last               2363
_journal_paper_doi               10.1039/D6CE00062B
_journal_volume                  28
_journal_year                    2026
_chemical_formula_moiety         'C26 H28 B2 Fe N10 O4, 2(Cl O4)'
_chemical_formula_sum            'C26 H28 B2 Cl2 Fe N10 O12'
_chemical_formula_weight         820.95
_chemical_properties_physical    Air-sensitive,Moisture-sensitive
_space_group_crystal_system      monoclinic
_space_group_IT_number           15
_space_group_name_Hall           '-C 2yc'
_space_group_name_H-M_alt        'C 1 2/c 1'
_atom_sites_solution_hydrogens   mixed
_audit_creation_date             2019-11-28
_audit_creation_method
;
Olex2 1.2
(compiled 2018.05.29 svn.r3508 for OlexSys, GUI svn.r5506)
;
_audit_update_record
;
2025-10-13 deposited with the CCDC.	2026-03-02 downloaded from the CCDC.
;
_cell_angle_alpha                90
_cell_angle_beta                 126.226(3)
_cell_angle_gamma                90
_cell_formula_units_Z            4
_cell_length_a                   25.4259(15)
_cell_length_b                   10.0950(5)
_cell_length_c                   16.2659(11)
_cell_measurement_reflns_used    9865
_cell_measurement_temperature    100(2)
_cell_measurement_theta_max      30.51
_cell_measurement_theta_min      3.05
_cell_volume                     3368.0(4)
_computing_cell_refinement       'SAINT V8.38A (Bruker AXS, 2016)'
_computing_data_collection       'Bruker APEX3 (Bruker AXS, 2015)'
_computing_data_reduction        'SAINT V8.38A (Bruker AXS, 2016)'
_computing_molecular_graphics    'SHELXTL 6.12 (Bruker AXS, 2002)'
_computing_publication_material  'Olex2 (Dolomanov et al., 2009)'
_computing_structure_refinement  'SHELXL-2018/3 (Sheldrick, 2015)'
_computing_structure_solution    'SHELX XT 2014/5 (Sheldrick, 2015)'
_diffrn_ambient_temperature      100(2)
_diffrn_measured_fraction_theta_full 0.997
_diffrn_measured_fraction_theta_max 0.998
_diffrn_measurement_device_type  'Bruker Kappa ImuS Duo Photon II CPAD'
_diffrn_measurement_method       '\f and \w scans'
_diffrn_radiation_monochromator  'Quazar focussing montel optics'
_diffrn_radiation_source         'ImuS high brilliance micro-focus tube'
_diffrn_radiation_type           MoK\a
_diffrn_radiation_wavelength     0.71073
_diffrn_reflns_av_R_equivalents  0.0478
_diffrn_reflns_av_unetI/netI     0.0205
_diffrn_reflns_Laue_measured_fraction_full 0.997
_diffrn_reflns_Laue_measured_fraction_max 0.998
_diffrn_reflns_limit_h_max       36
_diffrn_reflns_limit_h_min       -36
_diffrn_reflns_limit_k_max       14
_diffrn_reflns_limit_k_min       -14
_diffrn_reflns_limit_l_max       22
_diffrn_reflns_limit_l_min       -23
_diffrn_reflns_number            68150
_diffrn_reflns_point_group_measured_fraction_full 0.997
_diffrn_reflns_point_group_measured_fraction_max 0.998
_diffrn_reflns_theta_full        25.242
_diffrn_reflns_theta_max         30.524
_diffrn_reflns_theta_min         1.986
_diffrn_standards_number         0
_exptl_absorpt_coefficient_mu    0.684
_exptl_absorpt_correction_T_max  0.7461
_exptl_absorpt_correction_T_min  0.6874
_exptl_absorpt_correction_type   multi-scan
_exptl_absorpt_process_details
;
SADABS-2016/2 (Bruker,2016/2) was used for absorption correction.
wR2(int) was 0.0964 before and 0.0551 after correction.
The Ratio of minimum to maximum transmission is 0.9213.
The \l/2 correction factor is Not present.
;
_exptl_crystal_colour            orange
_exptl_crystal_density_diffrn    1.619
_exptl_crystal_description       block
_exptl_crystal_F_000             1680
_exptl_crystal_recrystallization_method
'Re-crystallisation from solvent: ethanol'
_exptl_crystal_size_max          0.2
_exptl_crystal_size_mid          0.06
_exptl_crystal_size_min          0.06
_refine_diff_density_max         0.484
_refine_diff_density_min         -0.548
_refine_diff_density_rms         0.062
_refine_ls_extinction_method     none
_refine_ls_goodness_of_fit_ref   1.054
_refine_ls_hydrogen_treatment    mixed
_refine_ls_matrix_type           full
_refine_ls_number_parameters     244
_refine_ls_number_reflns         5152
_refine_ls_number_restraints     0
_refine_ls_restrained_S_all      1.054
_refine_ls_R_factor_all          0.0385
_refine_ls_R_factor_gt           0.0314
_refine_ls_shift/su_max          0.002
_refine_ls_shift/su_mean         0.000
_refine_ls_structure_factor_coef Fsqd
_refine_ls_weighting_details
'w=1/[\s^2^(Fo^2^)+(0.0333P)^2^+5.1455P] where P=(Fo^2^+2Fc^2^)/3'
_refine_ls_weighting_scheme      calc
_refine_ls_wR_factor_gt          0.0761
_refine_ls_wR_factor_ref         0.0803
_reflns_Friedel_coverage         0.000
_reflns_number_gt                4553
_reflns_number_total             5152
_reflns_threshold_expression     'I > 2\s(I)'
_cod_data_source_file            d6ce00062b2.cif
_cod_data_source_block           mmk1908
_cod_depositor_comments
'Adding full bibliography for 7251766--7251769.cif.'
_cod_database_code               7251769
_shelx_shelxl_version_number     2018/3
_shelx_estimated_absorpt_t_max   0.960
_shelx_estimated_absorpt_t_min   0.875
_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, All O(H) groups
2.a Secondary CH2 refined with riding coordinates:
 C12(H12A,H12B)
2.b Aromatic/amide H refined with riding coordinates:
 C1(H1), C2(H2A), C3(H3), C5(H5), C7(H7), C9(H9), C10(H10), C11(H11)
2.c Idealised Me refined as rotating group:
 C13(H13A,H13B,H13C)
;
_shelx_res_checksum              28633
_olex2_submission_special_instructions 'No special instructions were received'