Titelbild: Komplexchemie im Unterricht: Der Spin‐Crossover‐Komplex Tris(4‐amino‐4H‐1,2,4‐triazol)‐eisen(II)‐sulfat (CHEMKON 1/2026)

Key Points

• To demonstrate the thermal effects on the properties of a spin-crossover complex for educational purposes.
• Visual demonstration using a hair dryer to heat the complex
• Cooling phase observed next to a neodymium magnet
• Color and magnetic property changes were recorded
• At low temperatures, the complex is violet and exhibits diamagnetic properties.
• Upon heating above 343 K, the complex becomes colorless-gray and shows paramagnetic properties.