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CRYSTAL STRUCTURE AND MAGNETIC PROPERTIES OF IRON(III) COMPLEXES OF PYRIDOXAL-4-ETHYLTHIOSEMICARBAZONE AND PYRIDOXAL AMINOPHENOL

Master Theses from JBPTITBPP / 2017-09-27 15:39:42
Oleh : ROBBY ROSWANDA (NIM 20506022), Central Library Institute Technology Bandung
Dibuat : 2007, dengan file

Keyword : Crystal Structure, Magnetic Properties of Iron(III) Complexes, Pyridoxal-4-Ethylthiosemicarbazone, Pyridoxal Aminophenol

The investigation of coordination compounds is of great interest because of their possibility to be used for memory devices since coordination compounds have the possibility exhibiting hysteresis effect. This possibility of hysteresis effect can be better understood if the information of structure and magnetic properties is known. In this study, two ligands, pyridoxal-4-ethylthiosmicarbazone and pyridoxal aminophenol, have been synthesized and reacted to iron(III) ion to prepare three iron(III) complexes compound. The synthesized ligands and their metal complexes were characterized by spectroscopic methods (1H NMR, FTIR, and mass spectroscopy), elemental analysis, and single crystal x-ray diffraction. The formulas for the three compounds were [Fe(H2ethpy)(C1)2](CH3C6H4SO3) 1, [Fe(H2ethpy)(ethpy)].3H2O 2, and Fe(H2pyap)(C1)3(H2O) 3 where H2ethpy is pyridoxal-4-ethylthiosmicarbazone and H2pyap is pyridoxal aminophenol. Magnetic behavior measurement at temperature range measured (5-300 K) revealed that 1 and 3 were in high spin state whereas 2 was in alow spin. Compound 1 is coordinated through ONSCl2 environment to create a five coordinated complex. This ONSCl2 geometry around the Fe(III) atom is an intermediate between trigonal bipyramidal and square pyramidal. Compound 2 is a neutral six coordinate iron(III) complex. In this compound, the ligand is bound to the metal ion in two different deprotonated forms: the mono-deprotonated note Hethpy and the di-deprotonated noted ethpy. Simple qualitative analysis showed that for compound 3 there is at least one chloride acting a non-coordinated anion.






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Deskripsi Alternatif :

The investigation of coordination compounds is of great interest because of their possibility to be used for memory devices since coordination compounds have the possibility exhibiting hysteresis effect. This possibility of hysteresis effect can be better understood if the information of structure and magnetic properties is known. In this study, two ligands, pyridoxal-4-ethylthiosmicarbazone and pyridoxal aminophenol, have been synthesized and reacted to iron(III) ion to prepare three iron(III) complexes compound. The synthesized ligands and their metal complexes were characterized by spectroscopic methods (1H NMR, FTIR, and mass spectroscopy), elemental analysis, and single crystal x-ray diffraction. The formulas for the three compounds were [Fe(H2ethpy)(C1)2](CH3C6H4SO3) 1, [Fe(H2ethpy)(ethpy)].3H2O 2, and Fe(H2pyap)(C1)3(H2O) 3 where H2ethpy is pyridoxal-4-ethylthiosmicarbazone and H2pyap is pyridoxal aminophenol. Magnetic behavior measurement at temperature range measured (5-300 K) revealed that 1 and 3 were in high spin state whereas 2 was in alow spin. Compound 1 is coordinated through ONSCl2 environment to create a five coordinated complex. This ONSCl2 geometry around the Fe(III) atom is an intermediate between trigonal bipyramidal and square pyramidal. Compound 2 is a neutral six coordinate iron(III) complex. In this compound, the ligand is bound to the metal ion in two different deprotonated forms: the mono-deprotonated note Hethpy and the di-deprotonated noted ethpy. Simple qualitative analysis showed that for compound 3 there is at least one chloride acting a non-coordinated anion.






(Penulis tidak mengizinkan karyanya dipublikasikan dalam bentuk full-text)

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  • Pembimbing : Dr. Djulia Onggo dan Dr. Petra van Koningsbrugggen, Editor: Rizki Apriyanti