UROP Proceedings 2020-21

School of Science Department of Chemistry 11 Design and Synthesis of Functional AIE luminogens and Exploration of their Biological Applications Supervisor: TANG Benzhong / CHEM Student: ZHAO Mengying / CHEM Course: UROP1000, Summer Nonconventional small luminophores lacking remarkable conjugations may exhibit excitation-dependent photoluminescence (PL) properties, which are generally considered to stem from the diverse aggregation or clustering of the non-conjugated electron-rich moieties. The phenomenon is termed clusteroluminescence, which can be rationalized through a clustering-triggered emission (CTE) mechanism. CTE has proven its great potential in designing and constructing novel, easily tunable luminophores in a variety of fields, including bioimaging, chemical sensors, and biomolecule conformation indicators. Based on the CTE mechanism, in this work, three originally nonemissive, nonconjugated molecules were reevaluated and clusteroluminescence was observed in the aggregated and solid states of the three molecules respectively. Upon the excitation of near-ultraviolet lights in different wavelengths, the emission wavelengths of the three molecules were varying from 387nm to 450nm. Extensive intermolecular H-bonding was proposed to elucidate the unusual clusteroluminescence. These findings will decode the working principle of nonconventional luminophores and facilitate a deeper understanding of color-tunable clusteroluminogens. Chemical Characterization of Atmospheric Pollutants Supervisor: YU Jianzhen / CHEM Student: LIU Sum Yee Roxanne / CHEM Course: UROP1100, Fall In this paper, high-performance anion-exchange chromatograph (HPAEC) with detection by pulsed amperometric detection (PAD) is used to detect and analyse monosaccharide anhydrides (MA) that are present in air such as levoglucosan and mannosan. The aim of the project is to do online analysis of MA with a low limit of detection so as to detect the scarce concentration of MA. However, the length of the report period is not adequate to accomplish the aim. During the report period, we mainly do offline analysis of the standard solutions of MA as well as develop the instrumentation for online analysis of MA.

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