A μ(1,1)- or μ(1,3)-carboxylate bridge makes the difference in the magnetic properties of dinuclear Mn(II) compounds.
Gómez, Verónica; Corbella, Montserrat; Font-Bardia, Mercé; Calvet, Teresa; Dalton transactions (Cambridge, England : 2003) 39 (2010) 11664–11674; doi:10.1039/c0dt00902d

data_7026917
_publ_section_title
;
 A \m(1,1)- or \m(1,3)-carboxylate bridge makes the difference in the
 magnetic properties of dinuclear Mn(II) compounds.
;
_journal_issue                   48
_journal_name_full
'Dalton transactions (Cambridge, England : 2003)'
_journal_page_first              11664
_journal_page_last               11674
_journal_paper_doi               10.1039/c0dt00902d
_journal_volume                  39
_journal_year                    2010
_chemical_compound_source        'synthesis as described'
_chemical_formula_moiety         'C62 H40 Cl2 Mn2 N8 O4, 2(Cl O4)'
_chemical_formula_sum            'C62 H40 Cl4 Mn2 N8 O12'
_chemical_formula_weight         1340.70
_chemical_name_systematic
;
?
;
_space_group_IT_number           12
_symmetry_cell_setting           monoclinic
_symmetry_Int_Tables_number      12
_symmetry_space_group_name_Hall  '-C 2y'
_symmetry_space_group_name_H-M   'C 1 2/m 1'
_atom_sites_solution_hydrogens   geom
_atom_sites_solution_primary     direct
_atom_sites_solution_secondary   difmap
_audit_conform_dict_location     ftp://ftp.iucr.org/pub/cif_core.dic
_audit_conform_dict_name         cif_core.dic
_audit_conform_dict_version      2.3
_audit_creation_date             2007-12-11T15:17:37-00:00
_audit_creation_method           'WinGX routine CIF_UPDATE'
_cell_angle_alpha                90
_cell_angle_beta                 96.055(9)
_cell_angle_gamma                90
_cell_formula_units_Z            2
_cell_length_a                   14.585(2)
_cell_length_b                   19.584(3)
_cell_length_c                   9.5953(13)
_cell_measurement_reflns_used    1581
_cell_measurement_temperature    100(2)
_cell_measurement_theta_max      25.51
_cell_measurement_theta_min      2.64
_cell_measurement_wavelength     0.71073
_cell_volume                     2725.4(7)
_computing_cell_refinement       'Bruker APEX II'
_computing_data_collection       'Bruker APEX II'
_computing_data_reduction        'Bruker APEX II'
_computing_molecular_graphics    'Ortep-3 for Windows (Farrugia, 1997)'
_computing_publication_material  'WinGX publication routines (Farrugia, 1999)'
_computing_structure_refinement  'SHELXL-97 (Sheldrick, 1997)'
_computing_structure_solution    'SIR97 (Giacovazzo et al, 1997)'
_diffrn_ambient_temperature      100(2)
_diffrn_measured_fraction_theta_full 0.997
_diffrn_measured_fraction_theta_max 0.997
_diffrn_measurement_device_type  'BrukerAXS ApexII-CCD area detector '
_diffrn_measurement_method       'phi and omega scans'
_diffrn_radiation_monochromator  graphite
_diffrn_radiation_probe          x-ray
_diffrn_radiation_source         'sealed tube'
_diffrn_radiation_type           MoK\a
_diffrn_radiation_wavelength     0.71069
_diffrn_reflns_av_R_equivalents  0.0660
_diffrn_reflns_av_unetI/netI     0.0487
_diffrn_reflns_limit_h_max       18
_diffrn_reflns_limit_h_min       -18
_diffrn_reflns_limit_k_max       24
_diffrn_reflns_limit_k_min       0
_diffrn_reflns_limit_l_max       11
_diffrn_reflns_limit_l_min       0
_diffrn_reflns_number            22223
_diffrn_reflns_theta_full        26.41
_diffrn_reflns_theta_max         26.41
_diffrn_reflns_theta_min         1.75
_exptl_absorpt_coefficient_mu    0.737
_exptl_absorpt_correction_T_max  0.94
_exptl_absorpt_correction_T_min  0.7609
_exptl_absorpt_correction_type   multi-scan
_exptl_absorpt_process_details   'BRUKER SADABS'
_exptl_crystal_colour            colourless
_exptl_crystal_density_diffrn    1.634
_exptl_crystal_density_method    'not measured'
_exptl_crystal_description       prism
_exptl_crystal_F_000             1364
_exptl_crystal_size_max          0.18
_exptl_crystal_size_mid          0.09
_exptl_crystal_size_min          0.09
_refine_diff_density_max         0.696
_refine_diff_density_min         -0.988
_refine_diff_density_rms         0.132
_refine_ls_extinction_method     none
_refine_ls_goodness_of_fit_ref   1.232
_refine_ls_hydrogen_treatment    constr
_refine_ls_matrix_type           full
_refine_ls_number_parameters     237
_refine_ls_number_reflns         2874
_refine_ls_number_restraints     0
_refine_ls_restrained_S_all      1.232
_refine_ls_R_factor_all          0.1050
_refine_ls_R_factor_gt           0.0850
_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^)+(0.0000P)^2^+63.1166P] where P=(Fo^2^+2Fc^2^)/3'
_refine_ls_weighting_scheme      calc
_refine_ls_wR_factor_gt          0.1951
_refine_ls_wR_factor_ref         0.2011
_reflns_number_gt                2246
_reflns_number_total             2878
_reflns_threshold_expression     >2sigma(I)
_cod_data_source_file            c0dt00902d.txt
_cod_data_source_block           compound5
_cod_original_sg_symbol_H-M      'C 2/m'
_cod_database_code               7026917