Accessibility and Selective Stabilization of the Principal Spin States of Iron by Pyridyl versus Phenolic Ketimines: Modulation of the 6A1←→2T2 Ground-State Transformation of the [FeN4O2]+ Chromophore
Musa S. Shongwe; Usama A. Al-Zaabi; Faizah Al-Mjeni; Carla S. Eribal; Ekkehard Sinn; Imaddin A. Al-Omari; Hussein H. Hamdeh; Dariusz Matoga; Harry Adams; Michael J. Morris; Arnold L. Rheingold; Eckhard Bill; David J. Sellmyer; Inorganic Chemistry 51 (2012) 8241–8253; doi:10.1021/ic300732r

data_4329827
_publ_section_title
;
 Accessibility and Selective Stabilization of the Principal Spin States of
 Iron by Pyridyl versus Phenolic Ketimines: Modulation of the
 6A1\\leftarrow\\rightarrow2T2 Ground-State Transformation of the
 [FeN4O2]+ Chromophore
;
_journal_name_full               'Inorganic Chemistry'
_journal_page_first              8241
_journal_page_last               8253
_journal_paper_doi               10.1021/ic300732r
_journal_volume                  51
_journal_year                    2012
_chemical_formula_sum            'C18 H20 N2 O2'
_chemical_formula_weight         296.36
_space_group_IT_number           14
_symmetry_cell_setting           monoclinic
_symmetry_space_group_name_Hall  '-P 2yn'
_symmetry_space_group_name_H-M   'P 1 21/n 1'
_atom_sites_solution_hydrogens   geom
_atom_sites_solution_primary     direct
_atom_sites_solution_secondary   difmap
_audit_creation_method           SHELXL-97
_cell_angle_alpha                90.00
_cell_angle_beta                 104.412(3)
_cell_angle_gamma                90.00
_cell_formula_units_Z            2
_cell_length_a                   5.6177(2)
_cell_length_b                   20.4136(8)
_cell_length_c                   6.7833(3)
_cell_measurement_reflns_used    4774
_cell_measurement_temperature    150(2)
_cell_measurement_theta_max      36.50
_cell_measurement_theta_min      3.26
_cell_volume                     753.41(5)
_computing_cell_refinement       'Bruker SMART'
_computing_data_collection       'Bruker SMART'
_computing_data_reduction        'Bruker SAINT'
_computing_molecular_graphics    'Bruker SHELXTL'
_computing_publication_material  'Bruker SHELXTL'
_computing_structure_refinement  'SHELXL-97 (Sheldrick, 1997)'
_computing_structure_solution    'SHELXS-97 (Sheldrick, 1990)'
_diffrn_ambient_temperature      150(2)
_diffrn_detector_area_resol_mean 100
_diffrn_measured_fraction_theta_full 1.000
_diffrn_measured_fraction_theta_max 0.996
_diffrn_measurement_device_type  'CCD area detector'
_diffrn_measurement_method       'phi and omega scans'
_diffrn_radiation_monochromator  graphite
_diffrn_radiation_source         'fine-focus sealed tube'
_diffrn_radiation_type           MoK\a
_diffrn_radiation_wavelength     0.71073
_diffrn_reflns_av_R_equivalents  0.0263
_diffrn_reflns_av_sigmaI/netI    0.0289
_diffrn_reflns_limit_h_max       7
_diffrn_reflns_limit_h_min       -9
_diffrn_reflns_limit_k_max       34
_diffrn_reflns_limit_k_min       -33
_diffrn_reflns_limit_l_max       11
_diffrn_reflns_limit_l_min       -8
_diffrn_reflns_number            15539
_diffrn_reflns_theta_full        25.00
_diffrn_reflns_theta_max         36.53
_diffrn_reflns_theta_min         2.00
_diffrn_standards_decay_%        0
_diffrn_standards_number         0
_exptl_absorpt_coefficient_mu    0.086
_exptl_absorpt_correction_T_max  0.9923
_exptl_absorpt_correction_T_min  0.9780
_exptl_absorpt_correction_type   multi-scan
_exptl_absorpt_process_details   sadabs
_exptl_crystal_colour            yellow
_exptl_crystal_density_diffrn    1.306
_exptl_crystal_description       Block
_exptl_crystal_F_000             316
_exptl_crystal_size_max          0.26
_exptl_crystal_size_mid          0.24
_exptl_crystal_size_min          0.09
_refine_diff_density_max         0.630
_refine_diff_density_min         -0.548
_refine_diff_density_rms         0.066
_refine_ls_extinction_method     none
_refine_ls_goodness_of_fit_ref   0.998
_refine_ls_hydrogen_treatment    constr
_refine_ls_matrix_type           full
_refine_ls_number_parameters     101
_refine_ls_number_reflns         3699
_refine_ls_number_restraints     0
_refine_ls_restrained_S_all      0.998
_refine_ls_R_factor_all          0.0677
_refine_ls_R_factor_gt           0.0487
_refine_ls_shift/su_max          0.000
_refine_ls_shift/su_mean         0.000
_refine_ls_structure_factor_coef Fsqd
_refine_ls_weighting_details
'calc w=1/[\s^2^(Fo^2^)+(0.0763P)^2^+0.2593P] where P=(Fo^2^+2Fc^2^)/3'
_refine_ls_weighting_scheme      calc
_refine_ls_wR_factor_gt          0.1331
_refine_ls_wR_factor_ref         0.1463
_reflns_number_gt                2791
_reflns_number_total             3699
_reflns_threshold_expression     >2sigma(I)
_cod_data_source_file            ic300732r_si_001_4.cif
_cod_data_source_block           H2hapen
_cod_database_code               4329827