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_7706562
_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(C24 H20 B)'
_chemical_formula_sum            'C100 H91 B2 Fe N7 O5'
_chemical_formula_weight         1548.26
_chemical_name_common            1(BPh4)-MeCN-163K
_chemical_name_systematic        1(BPh4)-MeCN-163K
_chemical_properties_physical    Air-sensitive
_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
_audit_block_doi                 10.5517/ccdc.csd.cc26n579
_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                 104.04(3)
_cell_angle_gamma                90
_cell_formula_units_Z            4
_cell_length_a                   14.263(3)
_cell_length_b                   38.290(8)
_cell_length_c                   15.471(3)
_cell_measurement_reflns_used    22683
_cell_measurement_temperature    163.15
_cell_measurement_theta_max      28.7134
_cell_measurement_theta_min      1.0636
_cell_volume                     8197(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    'ShelXL (Sheldrick, 2015)'
_diffrn_ambient_temperature      163.15
_diffrn_detector_area_resol_mean 28.5714
_diffrn_measured_fraction_theta_full 0.996
_diffrn_measured_fraction_theta_max 0.968
_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  0.0504
_diffrn_reflns_av_unetI/netI     0.0533
_diffrn_reflns_Laue_measured_fraction_full 0.996
_diffrn_reflns_Laue_measured_fraction_max 0.968
_diffrn_reflns_limit_h_max       18
_diffrn_reflns_limit_h_min       -18
_diffrn_reflns_limit_k_max       49
_diffrn_reflns_limit_k_min       -49
_diffrn_reflns_limit_l_max       14
_diffrn_reflns_limit_l_min       -19
_diffrn_reflns_number            55792
_diffrn_reflns_point_group_measured_fraction_full 0.996
_diffrn_reflns_point_group_measured_fraction_max 0.968
_diffrn_reflns_theta_full        25.242
_diffrn_reflns_theta_max         27.485
_diffrn_reflns_theta_min         2.042
_diffrn_source                   'Rotating Anode'
_exptl_absorpt_coefficient_mu    0.244
_exptl_absorpt_correction_T_max  1.0000
_exptl_absorpt_correction_T_min  0.8684
_exptl_absorpt_correction_type   multi-scan
_exptl_absorpt_process_details   'CrystalClear (Rigaku Inc., 2008)'
_exptl_crystal_colour            'dark red'
_exptl_crystal_density_diffrn    1.255
_exptl_crystal_description       block
_exptl_crystal_F_000             3264
_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          0.24
_exptl_crystal_size_min          0.15
_platon_squeeze_details
;
A solvent mask was calculated and 234 electrons were 
found in a volume of 1179\%A^3^ in 1 void per unit cell. 
This is consistent with the presence of [C2 H3 N], [C4 H10 O]  
per Formula Unit, which account for 256 electrons per unit cell.
;
_refine_diff_density_max         0.283
_refine_diff_density_min         -0.413
_refine_diff_density_rms         0.048
_refine_ls_extinction_method     none
_refine_ls_goodness_of_fit_ref   1.168
_refine_ls_hydrogen_treatment    constr
_refine_ls_matrix_type           full
_refine_ls_number_parameters     964
_refine_ls_number_reflns         18208
_refine_ls_number_restraints     0
_refine_ls_restrained_S_all      1.168
_refine_ls_R_factor_all          0.0880
_refine_ls_R_factor_gt           0.0773
_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^)+(0.0460P)^2^+5.8376P] where P=(Fo^2^+2Fc^2^)/3'
_refine_ls_weighting_scheme      calc
_refine_ls_wR_factor_gt          0.1607
_refine_ls_wR_factor_ref         0.1666
_reflns_Friedel_coverage         0.000
_reflns_number_gt                15906
_reflns_number_total             18208
_reflns_threshold_expression     'I > 2\s(I)'
_cod_data_source_file            d0dt03978k2.cif
_cod_data_source_block           2045170
_cod_depositor_comments
'Adding full bibliography for 7706562--7706567.cif.'
_cod_original_cell_volume        8196(3)
_cod_database_code               7706562
_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
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), C48(H48), C49(H49), C50(H50), C51(H51), C52(H52),
  C54(H54), C55(H55), C56(H56), C57(H57), C58(H58), C60(H60), C61(H61),
 C62(H62), C63(H63), C64(H64), C66(H66), C67(H67), C68(H68), C69(H69), C70(H70),
  C72(H72), C73(H73), C74(H74), C75(H75), C76(H76), C78(H78), C79(H79),
 C80(H80), C81(H81), C82(H82), C84(H84), C85(H85), C86(H86), C87(H87), C88(H88),
  C90(H90), C91(H91), C92(H92), C93(H93), C94(H94)
;
_smtbx_masks_void_probe_radius   1.2
_smtbx_masks_void_truncation_radius 1.2
_shelx_res_checksum              92148
_shelx_fab_checksum              4287
_platon_squeeze_void_probe_radius 1.20
_olex2_submission_special_instructions 'No special instructions were received'