Presentation description

Two-dimensional (2D) perovskites are hybrid inorganic-organic materials that are studied for applications in solar cells, LEDs, and barocaloric cooling. They can be chemically tuned by modifying the organic spacer cation, which has been shown to affect crystal structure and thermal behavior. While many studies have focused on alkyl and aromatic cations, ester alkylammonium cations remain largely unexplored. In this study, a series of ester alkylammonium cations were used to synthesize layered 2D perovskites with CuCl2 and MnCl2. The cations yielded crystalline perovskites, which was confirmed by powder X-ray diffraction (XRD). Differential scanning calorimetry (DSC) revealed that pure cations, such as methyl 4-aminobutyrate (Me4) and methyl 5-aminopentanoate (Me5), undergo sharp thermal transitions at 30-70 °C. In contrast, mixed cation hybrid systems, such as 50:50 Me4/Me5 and Me5/Me6, show suppressed thermal transitions. Single intermediate XRD peaks were also observed in these systems, consistent with solid solution formation. Additionally, thermogravimetric analysis (TGA) showed that these hybrid systems exhibit higher degradation onset temperatures than their pure cation counterparts, suggesting enhanced thermal stability.