#TITLE_ALTERNATIVE#

• Main Author: EKAJATI (NIM : 90512001)Pembimbing : Prof. Dr. Djulia Onggo, TRINARTI
• Format: Theses
• Language: Indonesia
• Online Access: https://digilib.itb.ac.id/gdl/view/19586
• Institution: Institut Teknologi Bandung

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 /> applied as electronic device materials. The compound show diamagnetic low spin <br /> <br /> <br /> <br /> <br /> states at certain temperature and change to paramagnetic high spin states when the <br /> <br /> <br /> <br /> <br /> temperature is increased. The transition occurred around room temperature and <br /> <br /> <br /> <br /> <br /> normally accompanied by color reversibly changing from pink to colorless. <br /> <br /> <br /> <br /> <br /> Interestingly, the transition is also influenced by counter anions. At room <br /> <br /> <br /> <br /> <br /> temperature, the complex with tetrafluoroborat counter anion is low spin however <br /> <br /> <br /> <br /> <br /> with hexafluorophosphate is high spin. For electronic device application, the <br /> <br /> <br /> <br /> <br /> complexes have been prepared in the thin layer form using nafion as a matrix. <br /> <br /> <br /> <br /> <br /> However the different counter anions could not be prepared because the nafion is <br /> <br /> <br /> <br /> <br /> anionic resin. In this research, the tris Htrz iron(II) complexes with sulphate, <br /> <br /> <br /> <br /> <br /> iodide and bromide have been prepared inside nata de coco biopolymer to <br /> <br /> <br /> <br /> <br /> obtained nano size. Their chemical formula are [Fe(Htrz)3]SO4, [Fe(Htrz)2(trz)]I <br /> <br /> <br /> <br /> <br /> and [Fe(Htrz)2(trz)]Br. Based on the chemical formula one of Htrz ligand is <br /> <br /> <br /> <br /> <br /> deprotonated to triazolato ion (trz-) for halide counter anion. The chemical <br /> <br /> <br /> <br /> <br /> formula are calculated from the mass ratio of the elements in complex by EDX <br /> <br /> <br /> <br /> <br /> (Energy Dispertion X Ray) data. The [Fe(Htrz)3]SO4 has a needle shape with <br /> <br /> <br /> <br /> <br /> average diameter of 0,3 &#956;m. It is stable at room temperature. When it is heated at <br /> <br /> <br /> <br /> <br /> 359-363 K the color was changed from pink to colorless. However, when the <br /> <br /> <br /> <br /> <br /> temperature is reduced the color change back to pink at 258 K. The <br /> <br /> <br /> <br /> <br /> [Fe(Htrz)2(trz)]I has a cylinder shape and it is not stable at room temperature. <br /> <br /> <br /> <br /> <br /> Therefore it should be stored inside ampule glass. The color of the complex <br /> <br /> <br /> <br /> <br /> change from pink to colorless at 386-391 K higher than the sulphate salt. <br /> <br /> <br /> <br /> <br /> However on the cooling mode the transition temperature was observed at 366-360 <br /> <br /> <br /> <br /> <br /> K. The [Fe(Htrz)2(trz)]Br complex is very unstable and the transition temperature <br /> <br /> <br /> <br /> <br /> could not be observed.