MnCl₂(C₆N₁₀H₆): Insights into a Luminescent Transition Metal-Melem Complex

In this work, the (MnCl₂(C₆N₁₀H₆) complex has been synthesized via solid-state reaction between manganese (II) chloride and melamine in the molar ratio of 1:2. A similar synthesis has been repeated with CoCl₂, and FeCl₂, resulting in two new metal-melam complexes (FeCl₂(C₆N₁₁H₉) and CoCl₂(C₆N₁₁H₉)). MnCl₂(C₆N₁₀H₆) crystallizes in the monoclinic crystal system with the space group I2/a. The crystalline powder of MnCl₂(C₆N₁₀H₆) was studied by X-ray diffraction, infrared spectroscopy, and thermogravimetric analysis to examine its structure and properties. MnCl₂(C₆N₁₀H₆) also shows good thermal stability up to 370 °C; however, the complete decomposition occurred at 900 °C, yielding Mn₇C₃. This paper presents an easy synthesis of the first luminescent transition metal-melem complex, providing new insights into the reactivity of melamine at elevated temperatures in the presence of transition metal chlorides.