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_7030957
_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            'C138 H180 Fe4 N12 O18'
_chemical_formula_weight         2518.34
_chemical_name_common            Fe4L6-tBu(R)
_chemical_name_systematic
; 
 ? 
;
_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                 91.988(2)
_cell_angle_gamma                90.00
_cell_formula_units_Z            2
_cell_length_a                   17.7804(3)
_cell_length_b                   21.4247(4)
_cell_length_c                   18.2283(4)
_cell_measurement_reflns_used    20350
_cell_measurement_temperature    180(2)
_cell_measurement_theta_max      27.1320
_cell_measurement_theta_min      3.2670
_cell_volume                     6939.7(2)
_computing_cell_refinement
;
CrysAlisPro, Agilent Technologies,
Version 1.171.36.21 (release 14-08-2012 CrysAlis171 .NET)
(compiled Sep 14 2012,17:21:16)
;
_computing_data_collection
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CrysAlisPro, Agilent Technologies,
Version 1.171.36.21 (release 14-08-2012 CrysAlis171 .NET)
(compiled Sep 14 2012,17:21:16)
;
_computing_data_reduction
;
CrysAlisPro, Agilent Technologies,
Version 1.171.36.21 (release 14-08-2012 CrysAlis171 .NET)
(compiled Sep 14 2012,17:21:16)
;
_computing_molecular_graphics
;
O. V. Dolomanov, L. J. Bourhis, R. J. Gildea, J. A. K. Howard and H. Puschmann,
OLEX2: a complete structure solution, refinement and analysis program.
J. Appl. Cryst. (2009). 42, 339-341.
;
_computing_publication_material  'SHELX-97 (Sheldrick, 1997)'
_computing_structure_refinement  'SHELXL-97 (Sheldrick, 1997)'
_computing_structure_solution    'SHELXS-97 (Sheldrick, 1990)'
_diffrn_ambient_temperature      180(2)
_diffrn_detector_area_resol_mean 10.3914
_diffrn_measured_fraction_theta_full 0.984
_diffrn_measured_fraction_theta_max 0.984
_diffrn_measurement_device_type  'SuperNova, Dual, Cu at zero, Atlas'
_diffrn_measurement_method       '\w scans'
_diffrn_radiation_monochromator  mirror
_diffrn_radiation_source         'SuperNova (Mo) X-ray Source'
_diffrn_radiation_type           MoK\a
_diffrn_radiation_wavelength     0.71073
_diffrn_reflns_av_R_equivalents  0.0265
_diffrn_reflns_av_sigmaI/netI    0.0445
_diffrn_reflns_limit_h_max       20
_diffrn_reflns_limit_h_min       -21
_diffrn_reflns_limit_k_max       26
_diffrn_reflns_limit_k_min       -25
_diffrn_reflns_limit_l_max       21
_diffrn_reflns_limit_l_min       -20
_diffrn_reflns_number            48179
_diffrn_reflns_theta_full        26.02
_diffrn_reflns_theta_max         26.02
_diffrn_reflns_theta_min         3.44
_diffrn_standards_decay_%        none
_exptl_absorpt_coefficient_mu    0.475
_exptl_absorpt_correction_T_max  1.00000
_exptl_absorpt_correction_T_min  0.74923
_exptl_absorpt_correction_type   multi-scan
_exptl_absorpt_process_details
; 
CrysAlisPro, Agilent Technologies,
Version 1.171.36.28 (release 01-02-2013 CrysAlis171 .NET)
(compiled Feb  1 2013,16:14:44)
Empirical absorption correction using spherical harmonics, implemented in SCALE3 ABSPACK scaling algorithm.
;
_exptl_crystal_colour            brown
_exptl_crystal_density_diffrn    1.205
_exptl_crystal_density_method    'not measured'
_exptl_crystal_description       block
_exptl_crystal_F_000             2680
_exptl_crystal_size_max          0.35
_exptl_crystal_size_mid          0.25
_exptl_crystal_size_min          0.15
_refine_diff_density_max         1.150
_refine_diff_density_min         -0.447
_refine_diff_density_rms         0.072
_refine_ls_abs_structure_details 'Flack H D (1983), Acta Cryst. A39, 876-881'
_refine_ls_abs_structure_Flack   -0.022(13)
_refine_ls_extinction_method     none
_refine_ls_goodness_of_fit_ref   1.039
_refine_ls_hydrogen_treatment    constr
_refine_ls_matrix_type           full
_refine_ls_number_parameters     1587
_refine_ls_number_reflns         25359
_refine_ls_number_restraints     449
_refine_ls_restrained_S_all      1.053
_refine_ls_R_factor_all          0.0758
_refine_ls_R_factor_gt           0.0604
_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^)+(0.1012P)^2^+5.0925P] where P=(Fo^2^+2Fc^2^)/3'
_refine_ls_weighting_scheme      calc
_refine_ls_wR_factor_gt          0.1574
_refine_ls_wR_factor_ref         0.1719
_reflns_number_gt                21372
_reflns_number_total             25359
_reflns_threshold_expression     >2sigma(I)
_cod_data_source_file            c3dt53317d2.cif
_cod_data_source_block           5R
_cod_depositor_comments
'Adding full bibliography for 7030953--7030957.cif.'
_cod_original_sg_symbol_H-M      P2(1)
_cod_database_code               7030957