An attempt to understand the observed plateau of the magnetization in tetranuclear iron(II) complexes of thiacalixarene macrocycles |
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Authors: | Ali Bayri H Gokhan Bakir Mustafa Sulu and Mustafa Karakaplan |
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Institution: | 1.Department of Physics, Arts and Science Faculty,Adiyaman University,Adiyaman,Turkey;2.Department of Physics, Arts and Science Faculty,Inonu University,Malatya,Turkey;3.Department of Chemistry, Arts and Science Faculty,Inonu University,Malatya,Turkey |
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Abstract: | The next-nearest-neighbour (NNN) effect in tetranuclear iron(II) complexes of thiacalixarene macrocycles using the isotropic
Heisenberg model has been investigated in order to understand its effects on the observed plateau of magnetization. Although
NNN effect is generally very weak in these kinds of systems, it was calculated that its response is quite significant to the
external perturbations in certain temperature regions. Using the isotropic Heisenberg exchange Hamiltonian, zero-field energy
spectra have been calculated for this particular tetranuclear system. The average magnetic moments with and without next-nearest-neighbour
interactions were also calculated. In order to verify the calculations, the results were compared with experimental data taken
from the literature, whence, it is suggested that observed magnetic behaviour can be improved by taking into account the NNN
effect. |
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