Effect of Metal and halogen Ions on the Electric and Magnetic Properties of Aniline Complexes
Nasser Salah EL-Din Hafez Yakout;
Abstract
Organic complexes of the general formula (y-CJ.4NH3) 2MCl4_xBrx, where
y=m, p, and o, M=Cu 2+, Ni2+, Mn2+, Co2
and x=O, 1, 2 had extensively been
investigated because of their many interesting electrical and magnetic properties.
Such complexes consist of nearly quadratic layers of metal ions, which are surrounded by halogen octahedra sharing comers within the layers. The metal halogen layers are separated from each other by organic group. NH3 exists in the cavities between the two octahedra attached by hydrogen bond to the halide atoms and covalently bonded to organic groups. In the layer the halide-metal-halide bridges are symmetrical, but the angle between them is not linear. The forward and backward tipping of the octahedra are produced and give what is called the puckering effect of the layer. The ordering in each layer is antiferromagnetic, while the layers are coupled ferromagnetically, except for the case of copper. This ferromagnetic coupling is decreased either by increasing the layer spacing or by increasing the number of carbon atoms.
Study of the physical properties such as electrical and magnetic properties of these complexes is the aim of this study. Powder samples were prepared using the standard technique.
Differential thermal analysis (DTA) thermograph was used to check the phase transi.tion of these complexes with temperature. Within the temperature range (300K-
500K), results reflect the existence of phase transition.
The variation of the ac conductivity with frequency at different temperatures for ortho, meta and para position for these complexes showed that, the calculated values of activation energy increased by increasing the number ofthe B(1 ions indicating a decrease in the electrical conductivity for this position. By increasing the frequency, the activation energy decreases in case of o and p oftetrachloro complexes due to increase in the conduction state of the system. Peculiar behaviour was observed in case of conductivity data of (m-CI-C6fLNH3)2CuCI4, where the activation energy
increases with increasing frequency. This may be due to the effect of Cl in the m-
y=m, p, and o, M=Cu 2+, Ni2+, Mn2+, Co2
and x=O, 1, 2 had extensively been
investigated because of their many interesting electrical and magnetic properties.
Such complexes consist of nearly quadratic layers of metal ions, which are surrounded by halogen octahedra sharing comers within the layers. The metal halogen layers are separated from each other by organic group. NH3 exists in the cavities between the two octahedra attached by hydrogen bond to the halide atoms and covalently bonded to organic groups. In the layer the halide-metal-halide bridges are symmetrical, but the angle between them is not linear. The forward and backward tipping of the octahedra are produced and give what is called the puckering effect of the layer. The ordering in each layer is antiferromagnetic, while the layers are coupled ferromagnetically, except for the case of copper. This ferromagnetic coupling is decreased either by increasing the layer spacing or by increasing the number of carbon atoms.
Study of the physical properties such as electrical and magnetic properties of these complexes is the aim of this study. Powder samples were prepared using the standard technique.
Differential thermal analysis (DTA) thermograph was used to check the phase transi.tion of these complexes with temperature. Within the temperature range (300K-
500K), results reflect the existence of phase transition.
The variation of the ac conductivity with frequency at different temperatures for ortho, meta and para position for these complexes showed that, the calculated values of activation energy increased by increasing the number ofthe B(1 ions indicating a decrease in the electrical conductivity for this position. By increasing the frequency, the activation energy decreases in case of o and p oftetrachloro complexes due to increase in the conduction state of the system. Peculiar behaviour was observed in case of conductivity data of (m-CI-C6fLNH3)2CuCI4, where the activation energy
increases with increasing frequency. This may be due to the effect of Cl in the m-
Other data
| Title | Effect of Metal and halogen Ions on the Electric and Magnetic Properties of Aniline Complexes | Other Titles | تأثير الأيونات المعدنية على الخواص الكهربية والمغناطيسية لمتراكبات الانيلين | Authors | Nasser Salah EL-Din Hafez Yakout | Issue Date | 2002 |
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