A family of enantiopure Fe(III)4 single molecule magnets: fine tuning of energy barrier by remote substituent.
Zhu, Yuan-Yuan; Cui, Chang; Qian, Kang; Yin, Ji; Wang, Bing-Wu; Wang, Zhe-Ming; Gao, Song; Dalton transactions (Cambridge, England : 2003) 43 (2014) 11897–11907; doi:10.1039/c3dt53317d

data_7030956
_publ_section_title
;
 A family of enantiopure Fe(III)4 single molecule magnets: fine tuning of
 energy barrier by remote substituent.
;
_journal_issue                   31
_journal_name_full
'Dalton transactions (Cambridge, England : 2003)'
_journal_page_first              11897
_journal_page_last               11907
_journal_paper_doi               10.1039/c3dt53317d
_journal_volume                  43
_journal_year                    2014
_chemical_absolute_configuration ad
_chemical_formula_sum            'C108 H114 Fe4 I6 N12 O18'
_chemical_formula_weight         2852.91
_chemical_name_common            Fe4L6-I(R)
_space_group_IT_number           4
_symmetry_cell_setting           monoclinic
_symmetry_space_group_name_Hall  'P 2yb'
_symmetry_space_group_name_H-M   'P 1 21 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                 104.65(3)
_cell_angle_gamma                90.00
_cell_formula_units_Z            2
_cell_length_a                   12.484(3)
_cell_length_b                   19.542(4)
_cell_length_c                   24.631(5)
_cell_measurement_reflns_used    17826
_cell_measurement_temperature    173(2)
_cell_measurement_theta_max      27.4844
_cell_measurement_theta_min      1.0420
_cell_volume                     5814(2)
_computing_cell_refinement       'CrystalClear (Rigaku Inc., 2008)'
_computing_data_collection       'CrystalClear (Rigaku Inc., 2008)'
_computing_data_reduction        'CrystalClear (Rigaku Inc., 2008)'
_computing_molecular_graphics
;
 Mercury: visualization and analysis of crystal structures, C. F. Macrae,
 P. R. Edgington, P. McCabe, E. Pidcock, G. P. Shields, R. Taylor,
 M. Towler and J. van de Streek, J. Appl. Cryst., 39, 453-457, 2006.
;
_computing_publication_material  'SHELX-97 (Sheldrick, 1997)'
_computing_structure_refinement  'SHELX-97 (Sheldrick, 1997)'
_computing_structure_solution    'SHELX-97 (Sheldrick, 1997)'
_diffrn_ambient_temperature      173(2)
_diffrn_detector_area_resol_mean 28.5714
_diffrn_measured_fraction_theta_full 0.994
_diffrn_measured_fraction_theta_max 0.994
_diffrn_measurement_device_type  'Saturn724+ CCD'
_diffrn_measurement_method       '\w scans at fixed \c = 45\%'
_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  0.0423
_diffrn_reflns_av_sigmaI/netI    0.0559
_diffrn_reflns_limit_h_max       16
_diffrn_reflns_limit_h_min       -16
_diffrn_reflns_limit_k_max       25
_diffrn_reflns_limit_k_min       -25
_diffrn_reflns_limit_l_max       31
_diffrn_reflns_limit_l_min       -31
_diffrn_reflns_number            39344
_diffrn_reflns_theta_full        27.47
_diffrn_reflns_theta_max         27.47
_diffrn_reflns_theta_min         0.85
_diffrn_standards_decay_%        none
_exptl_absorpt_coefficient_mu    2.149
_exptl_absorpt_correction_T_max  1.0000
_exptl_absorpt_correction_T_min  0.6950
_exptl_absorpt_correction_type   multi-scan
_exptl_absorpt_process_details   'CrystalClear (Rigaku Inc., 2008)'
_exptl_crystal_colour            brown
_exptl_crystal_density_diffrn    1.630
_exptl_crystal_density_method    'not measured'
_exptl_crystal_description       block
_exptl_crystal_F_000             2824
_exptl_crystal_size_max          0.36
_exptl_crystal_size_mid          0.32
_exptl_crystal_size_min          0.31
_refine_diff_density_max         1.739
_refine_diff_density_min         -1.236
_refine_diff_density_rms         0.228
_refine_ls_abs_structure_details 'Flack H D (1983), Acta Cryst. A39, 876-881'
_refine_ls_abs_structure_Flack   0.05(2)
_refine_ls_extinction_method     none
_refine_ls_goodness_of_fit_ref   1.110
_refine_ls_hydrogen_treatment    constr
_refine_ls_matrix_type           full
_refine_ls_number_parameters     1333
_refine_ls_number_reflns         23874
_refine_ls_number_restraints     166
_refine_ls_restrained_S_all      1.110
_refine_ls_R_factor_all          0.0742
_refine_ls_R_factor_gt           0.0687
_refine_ls_shift/su_max          0.001
_refine_ls_shift/su_mean         0.000
_refine_ls_structure_factor_coef Fsqd
_refine_ls_weighting_details
'calc w=1/[\s^2^(Fo^2^)+(0.1138P)^2^+11.8334P] where P=(Fo^2^+2Fc^2^)/3'
_refine_ls_weighting_scheme      calc
_refine_ls_wR_factor_gt          0.1926
_refine_ls_wR_factor_ref         0.2071
_reflns_number_gt                22673
_reflns_number_total             23874
_reflns_threshold_expression     >2sigma(I)
_cod_data_source_file            c3dt53317d2.cif
_cod_data_source_block           4R
_cod_depositor_comments
'Adding full bibliography for 7030953--7030957.cif.'
_cod_original_sg_symbol_H-M      P2(1)
_cod_database_code               7030956