Spin State Chemistry: Modulation of Ligand p K<sub>a</sub> by Spin State Switching in a [2×2] Iron(II) Grid-Type Complex.
Dhers, Sébastien; Mondal, Abhishake; Aguilà, David; Ramírez, Juan; Vela, Sergi; Dechambenoit, Pierre; Rouzières, Mathieu; Nitschke, Jonathan R.; Clérac, Rodolphe; Lehn, Jean-Marie; Journal of the American Chemical Society 140 (2018) 8218–8227; doi:10.1021/jacs.8b03735

data_4132414
_publ_section_title
;
 Spin State Chemistry: Modulation of Ligand p K<sub>a</sub> by Spin State
 Switching in a [2\\times 2] Iron(II) Grid-Type Complex.
;
_journal_issue                   26
_journal_name_full               'Journal of the American Chemical Society'
_journal_page_first              8218
_journal_page_last               8227
_journal_paper_doi               10.1021/jacs.8b03735
_journal_volume                  140
_journal_year                    2018
_chemical_formula_moiety         'C88 H70 Fe4 N32, 6(B F4), 8(C2 H3 N)'
_chemical_formula_sum            'C104 H94 B6 F24 Fe4 N40'
_chemical_formula_weight         2648.45
_space_group_crystal_system      monoclinic
_space_group_IT_number           14
_space_group_name_Hall           '-P 2ybc'
_space_group_name_H-M_alt        'P 1 21/c 1'
_atom_sites_solution_hydrogens   geom
_audit_creation_method           SHELXL-2014/7
_cell_angle_alpha                90
_cell_angle_beta                 115.376(4)
_cell_angle_gamma                90
_cell_formula_units_Z            4
_cell_length_a                   26.948(2)
_cell_length_b                   17.7359(15)
_cell_length_c                   27.532(2)
_cell_measurement_reflns_used    9967
_cell_measurement_temperature    290(2)
_cell_measurement_theta_max      24.46
_cell_measurement_theta_min      2.42
_cell_volume                     11889.2(16)
_computing_cell_refinement       'Bruker SAINT'
_computing_data_collection       'Bruker APEX2'
_computing_data_reduction        'Bruker SAINT'
_computing_structure_refinement  'SHELXL-2014/7 (Sheldrick, 2014)'
_computing_structure_solution    Superflip
_diffrn_ambient_temperature      290(2)
_diffrn_measured_fraction_theta_full 1.000
_diffrn_measured_fraction_theta_max 0.993
_diffrn_measurement_device_type  'Bruker APEX-II Quasar'
_diffrn_measurement_method       'phi and omega scans'
_diffrn_radiation_type           MoK\a
_diffrn_radiation_wavelength     0.71073
_diffrn_reflns_av_R_equivalents  0.0956
_diffrn_reflns_av_unetI/netI     0.0812
_diffrn_reflns_Laue_measured_fraction_full 1.000
_diffrn_reflns_Laue_measured_fraction_max 0.993
_diffrn_reflns_limit_h_max       33
_diffrn_reflns_limit_h_min       -33
_diffrn_reflns_limit_k_max       22
_diffrn_reflns_limit_k_min       -22
_diffrn_reflns_limit_l_max       34
_diffrn_reflns_limit_l_min       -34
_diffrn_reflns_number            198968
_diffrn_reflns_point_group_measured_fraction_full 1.000
_diffrn_reflns_point_group_measured_fraction_max 0.993
_diffrn_reflns_theta_full        25.242
_diffrn_reflns_theta_max         26.539
_diffrn_reflns_theta_min         1.637
_diffrn_source                   'Incoatec microfocus sealed tube'
_exptl_absorpt_coefficient_mu    0.581
_exptl_absorpt_correction_T_max  0.7454
_exptl_absorpt_correction_T_min  0.6813
_exptl_absorpt_correction_type   multi-scan
_exptl_absorpt_process_details   SADABS
_exptl_crystal_density_diffrn    1.480
_exptl_crystal_description       block
_exptl_crystal_F_000             5392
_exptl_crystal_size_max          0.100
_exptl_crystal_size_mid          0.090
_exptl_crystal_size_min          0.090
_refine_diff_density_max         0.951
_refine_diff_density_min         -0.494
_refine_diff_density_rms         0.073
_refine_ls_extinction_method     none
_refine_ls_goodness_of_fit_ref   1.023
_refine_ls_hydrogen_treatment    riding
_refine_ls_matrix_type           full
_refine_ls_number_parameters     1623
_refine_ls_number_reflns         24571
_refine_ls_number_restraints     28
_refine_ls_restrained_S_all      1.024
_refine_ls_R_factor_all          0.1363
_refine_ls_R_factor_gt           0.0703
_refine_ls_shift/su_max          0.008
_refine_ls_shift/su_mean         0.000
_refine_ls_structure_factor_coef Fsqd
_refine_ls_weighting_details
'w=1/[\s^2^(Fo^2^)+(0.0598P)^2^+27.6285P] where P=(Fo^2^+2Fc^2^)/3'
_refine_ls_weighting_scheme      calc
_refine_ls_wR_factor_gt          0.1622
_refine_ls_wR_factor_ref         0.1915
_reflns_Friedel_coverage         0.000
_reflns_number_gt                14053
_reflns_number_total             24571
_reflns_threshold_expression     'I > 2\s(I)'
_cod_data_source_file            ja8b03735_si_004.cif
_cod_data_source_block           shelx
_cod_original_cell_volume        11889.2(18)
_cod_original_sg_symbol_H-M      'P 21/c'
_cod_database_code               4132414
_shelx_shelxl_version_number     2014/7
_shelx_estimated_absorpt_t_min   0.944
_shelx_estimated_absorpt_t_max   0.950
_shelx_res_checksum              83583
_shelx_hkl_checksum              48058