Citation:
Luo Shuchang, Sun Xiaoyuan, Zheng Pengfei, Liu Xiangyu, Huang Renyi. Magnetic Studies of Isomorphous Replacement of MII Ions in {GdIIIMII}(M=Cu, Ni, Co, Fe, Mn) Complexes: A Theoretical Perspective[J]. Chemistry,
;2020, 83(5): 464-471.
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The magnetic properties was studied for a series of {GdIIIMII}(M=Cu, Ni, Co, Fe, Mn) heterobinuclear complexes by the combination of DFT calculations, using the different functional methods and basis sets, with the broken-symmetry approach. The results showed that the calculated values at the level of PBE0/TZVP (Gd is SARC-ZDRA-TZVP) are consistent with the experimental values, and this method can be used to describe its magnetic properties. There is a strong orbital interaction between the paramagnetic centers CuII and GdIII and bridged coordination oxygen atoms. The molecular magnetic orbital of the complex[CuIIGdIII{PyCO(OEt)Py C(OH)(OEt)Py}3]2+ are mainly contributed by 4fz3, 4fz(x2-y2) orbitals of the paramagnetic center GdIII, 3dx2-y2 orbital of CuII ion and p orbitals of the bridging oxygen atoms. Due to the compensation of spin delocalization from CuII ion and spin polarization from GdIII ion, the effect of spin delocalization from CuII ion on bridged oxygen atoms is greater than the spin polarization effect of paramagnetic center GdIII ion. Model calculations were used to examine the influence of the electronic configuration of the MII ions on the magnetic coupling constants. As a result, the increase of unpaired electrons of MII ions, the ρHS2-ρBS2 of the paramagnetic centers GdIII/MIIincreases, the contribution of antiferromagnetic coupling increases, whereas the values of the magnetic coupling constant decreases.
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