Abstract
[Bis(acetylacetonato)manganese(II)] complexes are important precursors for the synthesis of catalytic MnO nanoparticles. However, the mechanism of the formation of these materials still remains unknown. In this work, a combination of ex situ and synchrotron‐based in situ powder X‐ray diffraction with in situ pH, conductivity, and turbidity measurements was applied to investigate the concentration‐dependent formation of [Mn(acac)2(H2O)2]; interestingly [Mn(acac)2(H2O)2] undergoes an expansion of the unit cell during the synthesis as well as upon heating. Increasing the temperature to 80 °C caused the conversion of solid [Mn(acac)2(H2O)2] to the trimer compound [Mn(acac)2]3, which occurs ex situ (in solid state), but is hindered in solution. [Mn(acac)2(H2O)2] emits light in the blue‐green spectral range with emission maximum at 520 nm, measured in situ under real reaction conditions during its formation due to the instability of this compound.
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