STUDY ON INFRARED SPECTRA OF [Fe(Htrz)3]Cl2 AND ITS DERIVATIVES

• Main Author: Arifin
• Format: Final Project
• Language: Indonesia
• Subjects: Kimia
• Online Access: https://digilib.itb.ac.id/gdl/view/34686
• Institution: Institut Teknologi Bandung

Complex compounds of iron(II) with 1,2,4-triazole (Htrz) and its derivatives have been widely studied since they have unique characteristics in terms of their magnetic properties, in which they have two stable states with diamagnetic and paramagnetic properties. The diamagnetic character relates to the low spin (LS) state, while the paramagnetic character relates to high spin (HS) state. The transition between the two states depends on the changing temperature and it accompanied by distinct color, changing from purple to white. The characteristics of the transition are highly dependent on the type of counter anions that stabilize the complex. Chloride anion (Cl-) has been known that easily substituted by other anion, such as hexafluorophosphate (PF6-) and tetrafluoroborate (BF4-). In this research, Cl- in [Fe(Htrz)3]Cl2 is replaced by SCN-, [Fe(CN)6]4-, and [Cr(C2O4)3]3-. The products are characterized by Infrared (IR) Spectroscopy. Based on the IR data, Cl- has been replaced by SCN- successfully, as a simple substitution of the anion. The complex with SCN- as the anions has diamagnetic property similar to the chloride complex. However, the LS-HS transition didn’t observed in this complex. The replacement of Cl- by complex anions, such as [Fe(CN)6]4- and [Cr(C2O4)3]3-, seem to be unsuccessful. IR data of those complexes shows that the substitution doesn’t happened in simple substitution, but consisting of some complex reaction.