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Magnetic couplings in oxalate-bridged binuclear complexes, namely five isomers of [(VO)(2)(ox)(SCN)(6)](4-), trans-(equatorial, equatorial), cis-(equatorial, equatorial), trans-(axial, axial), cis-(axial, axial), and (axial, equatorial), as well as [Cr-2(ox)(SCN)(8)](4-), [Fe-2(ox)(SCN)(8)](4-), [CrFe(ox)(SCN)(8)](4-), [Fe-2(ox)(5)](4-), [Cr-2(ox)(5)](4-), [Ni-2(ox)(5)](6-), and [Cu-2(ox)(C12H8N2)(2)](2+), were calculated with the broken symmetry approach. Predominant antiferromagnetic coupling is found in almost all investigated complexes, except in [CrFe(ox)(SCN)(8)](4-). The best agreement with experimental values for the exchange coupling constants were obtained at the B3LYP level of theory, whereas the non-hybrid functionals gave the best trend for the investigated vanadium complexes. The linear relationship between coupling constant and (epsilon (2) - epsilon (1))(2) as well as linear dependence of J and the square of overlap integral of magnetic orbitals was estimated.

Magnetic couplings in oxalate-bridged binuclear complexes, namely five isomers of [(VO)(2)(ox)(SCN)(6)](4-), trans-(equatorial, equatorial), cis-(equatorial, equatorial), trans-(axial, axial), cis-(axial, axial), and (axial, equatorial), as well as [Cr-2(ox)(SCN)(8)](4-), [Fe-2(ox)(SCN)(8)](4-), [CrFe(ox)(SCN)(8)](4-), [Fe-2(ox)(5)](4-), [Cr-2(ox)(5)](4-), [Ni-2(ox)(5)](6-), and [Cu-2(ox)(C12H8N2)(2)](2+), were calculated with the broken symmetry approach. Predominant antiferromagnetic coupling is found in almost all investigated complexes, except in [CrFe(ox)(SCN)(8)](4-). The best agreement with experimental values for the exchange coupling constants were obtained at the B3LYP level of theory, whereas the non-hybrid functionals gave the best trend for the investigated vanadium complexes. The linear relationship between coupling constant and (epsilon (2) - epsilon (1))(2) as well as linear dependence of J and the square of overlap integral of magnetic orbitals was estimated.

Magnetic couplings in oxalate-bridged binuclear complexes, namely five isomers of [(VO)(2)(ox)(SCN)(6)](4-), trans-(equatorial, equatorial), cis-(equatorial, equatorial), trans-(axial, axial), cis-(axial, axial), and (axial, equatorial), as well as [Cr-2(ox)(SCN)(8)](4-), [Fe-2(ox)(SCN)(8)](4-), [CrFe(ox)(SCN)(8)](4-), [Fe-2(ox)(5)](4-), [Cr-2(ox)(5)](4-), [Ni-2(ox)(5)](6-), and [Cu-2(ox)(C12H8N2)(2)](2+), were calculated with the broken symmetry approach. Predominant antiferromagnetic coupling is found in almost all investigated complexes, except in [CrFe(ox)(SCN)(8)](4-). The best agreement with experimental values for the exchange coupling constants were obtained at the B3LYP level of theory, whereas the non-hybrid functionals gave the best trend for the investigated vanadium complexes. The linear relationship between coupling constant and (epsilon (2) - epsilon (1))(2) as well as linear dependence of J and the square of overlap integral of magnetic orbitals was estimated.

Magnetic couplings in oxalate-bridged binuclear complexes, namely five isomers of [(VO)(2)(ox)(SCN)(6)](4-), trans-(equatorial, equatorial), cis-(equatorial, equatorial), trans-(axial, axial), cis-(axial, axial), and (axial, equatorial), as well as [Cr-2(ox)(SCN)(8)](4-), [Fe-2(ox)(SCN)(8)](4-), [CrFe(ox)(SCN)(8)](4-), [Fe-2(ox)(5)](4-), [Cr-2(ox)(5)](4-), [Ni-2(ox)(5)](6-), and [Cu-2(ox)(C12H8N2)(2)](2+), were calculated with the broken symmetry approach. Predominant antiferromagnetic coupling is found in almost all investigated complexes, except in [CrFe(ox)(SCN)(8)](4-). The best agreement with experimental values for the exchange coupling constants were obtained at the B3LYP level of theory, whereas the non-hybrid functionals gave the best trend for the investigated vanadium complexes. The linear relationship between coupling constant and (epsilon (2) - epsilon (1))(2) as well as linear dependence of J and the square of overlap integral of magnetic orbitals was estimated.

Magnetic properties of the complexes [Mn(3-Clpcyd)(H(2)O)-(phen)(2)](+), [{Mn(3-Fpcyd)(MeOH)(phen)}(2)(mu-3-Fpcyd)(2)], [{Mn(3-Fpcyd)(EtOH)(phen)}(2)(mu-3-Fpcyd)(2)], [{Mn(3-Clpcyd)(MeOH)(phen)}(2)(mu-3-Clpcyd)(2)], and [{Mn(4-Clpcyd)(EtOH)(phen)}(2)(mu-4-Clpcyd)(2)] (where Xpcyd = halogeno-phenylcyanamido; phen = 1,10-phenanthroline) have been explored by means of density functional theory (DFT). Exchange coupling constants were calculated from the energy differences between the high-spin and broken-symmetry states. Very good agreement between theoretical and experimental data was achieved. The g-tensor calculations were performed employing the coupled perturbed Kohn-Sham equations. Molecular mechanics calculations have been performed to elucidate structural features in the five complexes. Finally, the reliability of the molecular mechanics results was confirmed by comparing the magnetic couplings calculated on optimized structures with experimental data.

Magnetic properties of the complexes [Mn(3-Clpcyd)(H(2)O)-(phen)(2)](+), [{Mn(3-Fpcyd)(MeOH)(phen)}(2)(mu-3-Fpcyd)(2)], [{Mn(3-Fpcyd)(EtOH)(phen)}(2)(mu-3-Fpcyd)(2)], [{Mn(3-Clpcyd)(MeOH)(phen)}(2)(mu-3-Clpcyd)(2)], and [{Mn(4-Clpcyd)(EtOH)(phen)}(2)(mu-4-Clpcyd)(2)] (where Xpcyd = halogeno-phenylcyanamido; phen = 1,10-phenanthroline) have been explored by means of density functional theory (DFT). Exchange coupling constants were calculated from the energy differences between the high-spin and broken-symmetry states. Very good agreement between theoretical and experimental data was achieved. The g-tensor calculations were performed employing the coupled perturbed Kohn-Sham equations. Molecular mechanics calculations have been performed to elucidate structural features in the five complexes. Finally, the reliability of the molecular mechanics results was confirmed by comparing the magnetic couplings calculated on optimized structures with experimental data.

Magnetic properties of the complexes [Mn(3-Clpcyd)(H(2)O)-(phen)(2)](+), [{Mn(3-Fpcyd)(MeOH)(phen)}(2)(mu-3-Fpcyd)(2)], [{Mn(3-Fpcyd)(EtOH)(phen)}(2)(mu-3-Fpcyd)(2)], [{Mn(3-Clpcyd)(MeOH)(phen)}(2)(mu-3-Clpcyd)(2)], and [{Mn(4-Clpcyd)(EtOH)(phen)}(2)(mu-4-Clpcyd)(2)] (where Xpcyd = halogeno-phenylcyanamido; phen = 1,10-phenanthroline) have been explored by means of density functional theory (DFT). Exchange coupling constants were calculated from the energy differences between the high-spin and broken-symmetry states. Very good agreement between theoretical and experimental data was achieved. The g-tensor calculations were performed employing the coupled perturbed Kohn-Sham equations. Molecular mechanics calculations have been performed to elucidate structural features in the five complexes. Finally, the reliability of the molecular mechanics results was confirmed by comparing the magnetic couplings calculated on optimized structures with experimental data.

Magnetic properties of the complexes [Mn(3-Clpcyd)(H(2)O)-(phen)(2)](+), [{Mn(3-Fpcyd)(MeOH)(phen)}(2)(mu-3-Fpcyd)(2)], [{Mn(3-Fpcyd)(EtOH)(phen)}(2)(mu-3-Fpcyd)(2)], [{Mn(3-Clpcyd)(MeOH)(phen)}(2)(mu-3-Clpcyd)(2)], and [{Mn(4-Clpcyd)(EtOH)(phen)}(2)(mu-4-Clpcyd)(2)] (where Xpcyd = halogeno-phenylcyanamido; phen = 1,10-phenanthroline) have been explored by means of density functional theory (DFT). Exchange coupling constants were calculated from the energy differences between the high-spin and broken-symmetry states. Very good agreement between theoretical and experimental data was achieved. The g-tensor calculations were performed employing the coupled perturbed Kohn-Sham equations. Molecular mechanics calculations have been performed to elucidate structural features in the five complexes. Finally, the reliability of the molecular mechanics results was confirmed by comparing the magnetic couplings calculated on optimized structures with experimental data.