#TITLE_ALTERNATIVE#
The iron(II) complexes of 1,2,4-4(H)-triazole (Htrz) have been synthetized for <br /> <br /> <br /> <br /> <br /> many years because the complexes show unique physical properties that can be <br /> <br /> <br /> <br /> <br /> ap...
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Format: | Theses |
Language: | Indonesia |
Online Access: | https://digilib.itb.ac.id/gdl/view/19586 |
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Institution: | Institut Teknologi Bandung |
Language: | Indonesia |
Summary: | The iron(II) complexes of 1,2,4-4(H)-triazole (Htrz) have been synthetized for <br />
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many years because the complexes show unique physical properties that can be <br />
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applied as electronic device materials. The compound show diamagnetic low spin <br />
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states at certain temperature and change to paramagnetic high spin states when the <br />
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temperature is increased. The transition occurred around room temperature and <br />
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normally accompanied by color reversibly changing from pink to colorless. <br />
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Interestingly, the transition is also influenced by counter anions. At room <br />
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temperature, the complex with tetrafluoroborat counter anion is low spin however <br />
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with hexafluorophosphate is high spin. For electronic device application, the <br />
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complexes have been prepared in the thin layer form using nafion as a matrix. <br />
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However the different counter anions could not be prepared because the nafion is <br />
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anionic resin. In this research, the tris Htrz iron(II) complexes with sulphate, <br />
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iodide and bromide have been prepared inside nata de coco biopolymer to <br />
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obtained nano size. Their chemical formula are [Fe(Htrz)3]SO4, [Fe(Htrz)2(trz)]I <br />
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and [Fe(Htrz)2(trz)]Br. Based on the chemical formula one of Htrz ligand is <br />
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deprotonated to triazolato ion (trz-) for halide counter anion. The chemical <br />
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formula are calculated from the mass ratio of the elements in complex by EDX <br />
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(Energy Dispertion X Ray) data. The [Fe(Htrz)3]SO4 has a needle shape with <br />
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average diameter of 0,3 μm. It is stable at room temperature. When it is heated at <br />
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359-363 K the color was changed from pink to colorless. However, when the <br />
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temperature is reduced the color change back to pink at 258 K. The <br />
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[Fe(Htrz)2(trz)]I has a cylinder shape and it is not stable at room temperature. <br />
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Therefore it should be stored inside ampule glass. The color of the complex <br />
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change from pink to colorless at 386-391 K higher than the sulphate salt. <br />
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However on the cooling mode the transition temperature was observed at 366-360 <br />
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K. The [Fe(Htrz)2(trz)]Br complex is very unstable and the transition temperature <br />
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could not be observed. |
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