Enhancing single molecule magnet parameters. Synthesis, crystal structures and magnetic properties of mixed-valent Mn<small><sub>4</sub></small> SMMs
Ayuk M. Ako; Valeriu Mereacre; Ian J. Hewitt; Rodolphe Clérac; Lollita Lecren; Christopher E. Anson; Annie K. Powell; Journal of Materials Chemistry 16 (2006) 2579–; doi:10.1039/b604611h

data_7203413
_publ_section_title
;
 Enhancing single molecule magnet parameters. Synthesis, crystal
 structures and magnetic properties of mixed-valent
 Mn<small><sub>4</sub></small> SMMs
;
_journal_issue                   26
_journal_name_full               'Journal of Materials Chemistry'
_journal_page_first              2579
_journal_paper_doi               10.1039/b604611h
_journal_volume                  16
_journal_year                    2006
_chemical_formula_sum            'C52 H106 Mn4 N4 O16'
_chemical_formula_weight         1263.17
_space_group_IT_number           14
_symmetry_cell_setting           monoclinic
_symmetry_space_group_name_Hall  '-P 2ybc'
_symmetry_space_group_name_H-M   'P 1 21/c 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                 95.053(1)
_cell_angle_gamma                90.00
_cell_formula_units_Z            2
_cell_length_a                   13.2125(7)
_cell_length_b                   10.9602(6)
_cell_length_c                   22.4329(11)
_cell_measurement_reflns_used    9992
_cell_measurement_temperature    100(2)
_cell_measurement_theta_max      27.89
_cell_measurement_theta_min      2.42
_cell_volume                     3235.9(3)
_computing_cell_refinement       'SMART-NT 5.6 (Bruker AXS Inc., 2000)'
_computing_data_collection       'SMART-NT 5.6 (Bruker AXS Inc., 2000)'
_computing_data_reduction        'SAINT+ 6.0 (Bruker AXS Inc., 2000)'
_computing_molecular_graphics    'SHELXTL 5.1 (Bruker AXS Inc., 1997)'
_computing_publication_material  'SHELXTL 5.1 (Bruker AXS Inc., 1997)'
_computing_structure_refinement  'SHELXTL 5.1 (Bruker AXS Inc., 1997)'
_computing_structure_solution    'SHELXTL 5.1 (Bruker AXS Inc., 1997)'
_diffrn_ambient_temperature      100(2)
_diffrn_detector_area_resol_mean 8.333
_diffrn_measured_fraction_theta_full 0.998
_diffrn_measured_fraction_theta_max 0.929
_diffrn_measurement_device_type  'Bruker SMART Apex'
_diffrn_measurement_method       'CCD area detector'
_diffrn_radiation_monochromator  graphite
_diffrn_radiation_source         'rotating anode'
_diffrn_radiation_type           MoK\a
_diffrn_radiation_wavelength     0.71073
_diffrn_reflns_av_R_equivalents  0.0199
_diffrn_reflns_av_sigmaI/netI    0.0292
_diffrn_reflns_limit_h_max       16
_diffrn_reflns_limit_h_min       -17
_diffrn_reflns_limit_k_max       8
_diffrn_reflns_limit_k_min       -14
_diffrn_reflns_limit_l_max       29
_diffrn_reflns_limit_l_min       -29
_diffrn_reflns_number            15880
_diffrn_reflns_theta_full        25.00
_diffrn_reflns_theta_max         27.99
_diffrn_reflns_theta_min         1.82
_exptl_absorpt_coefficient_mu    0.825
_exptl_absorpt_correction_T_max  0.894
_exptl_absorpt_correction_T_min  0.781
_exptl_absorpt_correction_type   multi-scan
_exptl_absorpt_process_details   'SADABS (Bruker AXS Inc., 2000)'
_exptl_crystal_colour            orange
_exptl_crystal_density_diffrn    1.296
_exptl_crystal_density_method    'not measured'
_exptl_crystal_description       block
_exptl_crystal_F_000             1348
_exptl_crystal_size_max          0.22
_exptl_crystal_size_mid          0.14
_exptl_crystal_size_min          0.09
_refine_diff_density_max         0.486
_refine_diff_density_min         -0.286
_refine_diff_density_rms         0.058
_refine_ls_extinction_method     none
_refine_ls_goodness_of_fit_ref   0.973
_refine_ls_hydrogen_treatment    mixed
_refine_ls_matrix_type           full
_refine_ls_number_parameters     346
_refine_ls_number_reflns         7254
_refine_ls_number_restraints     1
_refine_ls_restrained_S_all      0.973
_refine_ls_R_factor_all          0.0357
_refine_ls_R_factor_gt           0.0278
_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^)+(0.0476P)^2^+0.0000P] where P=(Fo^2^+2Fc^2^)/3'
_refine_ls_weighting_scheme      calc
_refine_ls_wR_factor_gt          0.0721
_refine_ls_wR_factor_ref         0.0740
_reflns_number_gt                5927
_reflns_number_total             7254
_reflns_threshold_expression     >2sigma(I)
_cod_data_source_file            b604611h.txt
_cod_data_source_block           a196b
_cod_database_code               7203413