Ligand symmetry significantly affects spin crossover behaviour in isomeric [Fe(pybox)<sub>2</sub>]<sup>2+</sup> complexes.
Wang, Run-Guo; Meng, Yin-Shan; Gao, Fang-Fang; Gao, Wan-Qing; Liu, Chun-Hua; Li, Anyang; Liu, Tao; Zhu, Yuan-Yuan; Dalton transactions (Cambridge, England : 2003) 50 (2021) 3369–3378; doi:10.1039/d0dt03978k

data_7706567
_publ_section_title
;
 Ligand symmetry significantly affects spin crossover behaviour in
 isomeric [Fe(pybox)<sub>2</sub>]<sup>2+</sup> complexes.
;
_journal_issue                   9
_journal_name_full
'Dalton transactions (Cambridge, England : 2003)'
_journal_page_first              3369
_journal_page_last               3378
_journal_paper_doi               10.1039/d0dt03978k
_journal_volume                  50
_journal_year                    2021
_chemical_compound_source        no
_chemical_formula_moiety         'C46 H38 Fe N6 O4, 2(B F4), C2 H3 N'
_chemical_formula_sum            'C48 H41 B2 F8 Fe N7 O4'
_chemical_formula_weight         1009.35
_chemical_name_common            1(BF4)-MeCN-163K
_chemical_name_systematic        1(BF4)-MeCN-163K
_chemical_properties_physical    Air-sensitive
_space_group_crystal_system      orthorhombic
_space_group_IT_number           61
_space_group_name_Hall           '-P 2ac 2ab'
_space_group_name_H-M_alt        'P b c a'
_atom_sites_solution_hydrogens   geom
_atom_sites_solution_primary     dual
_audit_creation_date             2021-01-20
_audit_creation_method
;
Olex2 1.3
(compiled 2020.11.12 svn.r5f609507 for OlexSys, GUI svn.r6226)
;
_audit_update_record
;
2021-01-20 deposited with the CCDC.	2021-01-27 downloaded from the CCDC.
;
_cell_angle_alpha                90
_cell_angle_beta                 90
_cell_angle_gamma                90
_cell_formula_units_Z            8
_cell_length_a                   17.173(3)
_cell_length_b                   16.506(3)
_cell_length_c                   31.917(6)
_cell_measurement_reflns_used    25842
_cell_measurement_temperature    163.15
_cell_measurement_theta_max      27.4430
_cell_measurement_theta_min      0.6380
_cell_volume                     9047(3)
_computing_cell_refinement       'CrystalClear (Rigaku Inc., 2008)'
_computing_data_collection       'CrystalClear (Rigaku Inc., 2008)'
_computing_data_reduction        'CrystalClear (Rigaku Inc., 2008)'
_computing_molecular_graphics    'Olex2 1.3 (Dolomanov et al., 2009)'
_computing_publication_material  'Olex2 1.3 (Dolomanov et al., 2009)'
_computing_structure_refinement  'SHELXL 2018/3 (Sheldrick, 2015)'
_computing_structure_solution    'SHELXT 2014/5 (Sheldrick, 2014)'
_diffrn_ambient_temperature      163.15
_diffrn_detector_area_resol_mean 28.5714
_diffrn_measured_fraction_theta_full 0.998
_diffrn_measured_fraction_theta_max 0.998
_diffrn_measurement_device_type  'MM007HF + CCD (Saturn724+)'
_diffrn_measurement_method       '\w scans at fixed \c = 45\%'
_diffrn_radiation_monochromator  Confocal
_diffrn_radiation_type           MoK\a
_diffrn_radiation_wavelength     0.71073
_diffrn_reflns_av_R_equivalents  0.0650
_diffrn_reflns_av_unetI/netI     0.0539
_diffrn_reflns_Laue_measured_fraction_full 0.998
_diffrn_reflns_Laue_measured_fraction_max 0.998
_diffrn_reflns_limit_h_max       17
_diffrn_reflns_limit_h_min       -20
_diffrn_reflns_limit_k_max       13
_diffrn_reflns_limit_k_min       -20
_diffrn_reflns_limit_l_max       34
_diffrn_reflns_limit_l_min       -38
_diffrn_reflns_number            36594
_diffrn_reflns_point_group_measured_fraction_full 0.998
_diffrn_reflns_point_group_measured_fraction_max 0.998
_diffrn_reflns_theta_full        25.242
_diffrn_reflns_theta_max         25.679
_diffrn_reflns_theta_min         1.742
_diffrn_source                   'Rotating Anode'
_exptl_absorpt_coefficient_mu    0.421
_exptl_absorpt_correction_T_max  1.0000
_exptl_absorpt_correction_T_min  0.6624
_exptl_absorpt_correction_type   multi-scan
_exptl_absorpt_process_details   'CrystalClear (Rigaku Inc., 2008)'
_exptl_crystal_colour            'dark red'
_exptl_crystal_density_diffrn    1.482
_exptl_crystal_density_method    'not measured'
_exptl_crystal_description       block
_exptl_crystal_F_000             4144
_exptl_crystal_preparation       'Magnetic properties'
_exptl_crystal_recrystallization_method
'Re-crystallisation from solvent: acetonitrile and ether'
_exptl_crystal_size_max          0.30
_exptl_crystal_size_mid          0.25
_exptl_crystal_size_min          0.17
_refine_diff_density_max         0.454
_refine_diff_density_min         -0.387
_refine_diff_density_rms         0.063
_refine_ls_extinction_method     none
_refine_ls_goodness_of_fit_ref   1.292
_refine_ls_hydrogen_treatment    constr
_refine_ls_matrix_type           full
_refine_ls_number_parameters     632
_refine_ls_number_reflns         8565
_refine_ls_number_restraints     0
_refine_ls_restrained_S_all      1.292
_refine_ls_R_factor_all          0.0907
_refine_ls_R_factor_gt           0.0839
_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^)+(0.0095P)^2^+19.4713P] where P=(Fo^2^+2Fc^2^)/3'
_refine_ls_weighting_scheme      calc
_refine_ls_wR_factor_gt          0.1378
_refine_ls_wR_factor_ref         0.1407
_reflns_Friedel_coverage         0.000
_reflns_number_gt                8037
_reflns_number_total             8565
_reflns_threshold_expression     'I > 2\s(I)'
_cod_data_source_file            d0dt03978k2.cif
_cod_data_source_block           2045168
_cod_depositor_comments
'Adding full bibliography for 7706562--7706567.cif.'
_cod_database_code               7706567
_shelx_shelxl_version_number     2018/3
_exptl_absorpt_special_details
;
    Higashi, T. (1995). Program for Absorption Correction.
    Rigaku Corporation, Tokyo, Japan.
;
_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:
 C7(H7), C17(H17), C30(H30), C40(H40)
2.b Secondary CH2 refined with riding coordinates:
 C8(H8A,H8B), C16(H16A,H16B), C31(H31A,H31B), C39(H39A,H39B)
2.c Aromatic/amide H refined with riding coordinates:
 C2(H2), C3(H3), C4(H4), C5(H5), C6(H6), C11(H11), C12(H12), C13(H13),
 C19(H19), C20(H20), C21(H21), C22(H22), C23(H23), C25(H25), C26(H26), C27(H27),
  C28(H28), C29(H29), C34(H34), C35(H35), C36(H36), C42(H42), C43(H43),
 C44(H44), C45(H45), C46(H46)
2.d Idealised Me refined as rotating group:
 C48(H48A,H48B,H48C)
;
_shelx_res_checksum              23751
_olex2_submission_special_instructions 'No special instructions were received'