Corbin Brian, Houglan Paityn, Pang Yi
Department of Chemistry, The University of Akron, Akron, OH 44325, USA.
Molecules. 2024 Dec 18;29(24):5972. doi: 10.3390/molecules29245972.
The chalcone derivatives with hydroxy group () have been examined using low-temperature fluorescence spectroscopy. The study aimed to freeze the intramolecular charge transfer (ICT) motion in order to reveal the potential hidden transition(s) that are difficult to observe at room temperature. Although chalcone revealed one emission peak at ~667 nm at room temperature, it exhibited two emission peaks (λ = 580 and 636 nm) in EtOH at liquid N temperatures (77 K). With the aid of model compound with methoxy group and aluminum complex -Al, attempts were made to assign these emission peaks. The results point towards the possibility of the coexistence of ICT and excited state intramolecular proton transfer (ESIPT) in the chalcone derivatives with extended conjugation.
已使用低温荧光光谱法对含羟基的查尔酮衍生物进行了研究。该研究旨在冻结分子内电荷转移（ICT）运动，以揭示在室温下难以观察到的潜在隐藏跃迁。尽管查尔酮在室温下在~667 nm处显示出一个发射峰，但在液氮温度（77 K）下于乙醇中它呈现出两个发射峰（λ = 580和636 nm）。借助含甲氧基的模型化合物 和铝配合物 -Al，尝试对这些发射峰进行归属。结果表明，在具有扩展共轭的查尔酮衍生物中，ICT和激发态分子内质子转移（ESIPT）可能共存。
