Synthesize of [Fe(Htrz)2(trz)]X.nH2O Complex with X= PF6-, B(C6H5)4- and CCl3COO- from [Fe(Htrz)2(trz)]BF4
Compounds of iron (II) complexes with triazole derivative ligands are unique compounds. In the octahedral ligand field, the compound has two states, namely low spin (LS) and high spin (HS) states. The two states may change reversibly depending on external influences such as temperature and magnetic...
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| Format: | Theses |
| Language: | Indonesia |
| Online Access: | https://digilib.itb.ac.id/gdl/view/28751 |
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| Institution: | Institut Teknologi Bandung |
| Language: | Indonesia |
| Summary: | Compounds of iron (II) complexes with triazole derivative ligands are unique compounds. In the octahedral ligand field, the compound has two states, namely low spin (LS) and high spin (HS) states. The two states may change reversibly depending on external influences such as temperature and magnetic fields. This phenomenon is known as spin crossover (SCO). Visually, the change of spin state is marked by a change of color from purple (diamagnetic) to white (paramagnetic) or vice versa. These characteristics make these complex compounds very potential to be applied as information stores, molecular switches, and sensors. One of complexes that show SCO phenomenon was [Fe(Htrz)2(trz)]BF4. At room temperature, this complex is purple with diamagnetic properties, while when the temperature is increased the colour changed to white with paramagnetic properties. The formation of [Fe(Htrz)2(trz)]BF4 complex need at least 1 hour which is marked by the appearance of purple solid. Therefore BF4- anion can be replaced by other anion such as PF6-, B(C6H5)4- and CCl3COO-. The result show [Fe(Htrz)(trz)]B(C6H5) and [Fe(Htrz)2(trz)]CCl3COO complexes have similar color with [Fe(Htrz)2(trz)]BF4 and are diamagnetic. While [Fe(Htrz)2(trz)]PF6 complexes is paramagnetic at room temperature. Qualitatively, the succesful can be observed from EDS data. Quantitatively, chemical formula of each complexes were : [Fe(Htrz)2(trz)]PF6.1,5H2O with percentage of C=17,42% (16.65%), H=1.93% (2.53%), and N=29.20% (29.09%) while [Fe(Htrz)2(trz)]B(C6H5)4.1.5H2O complexes with percentage of C=59.22%(59.11%),H=5.14%(5.09%), N=20.79% (20.70%), and also [Fe(Htrz)2(trz)]CCl3COO.2H2O complexes with percentage of C = 20.84% (20.00%), H = 2.43% (2.60%), and N = 27.85% (27.36%). The presence of water hydrates in all of these complexes is determined by TGA. Temperature transisition of [Fe(Htrz)2(trz)]B(C6H5)4.1.5H2O complex is 440 K and greater than [Fe(Htrz)2(trz)]CCl3COO.2H2O that has temperature transisition is 363 K. And so as the hysteresis curve of [Fe(Htrz)2(trz)]B(C6H5)4.1.5H2O is 62 K and wider than [Fe(Htrz)2(trz)]CCl3COO.2H2O (18.5 K). |
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