Guo, Zhewen; Li, Guangfeng; Wang, Heng; Zhao, Jun; Liu, Yuhang; Tan, Hongwei; Li, Xiaopeng; Stang, Peter J.; Yan, Xuzhou published an article in 2021. The article was titled 《Drum-like Metallacages with Size-Dependent Fluorescence: Exploring the Photophysics of Tetraphenylethylene under Locked Conformations》, and you may find the article in Journal of the American Chemical Society.Electric Literature of C5H6BNO2 The information in the text is summarized as follows:
Materials with aggregation-induced emission (AIE) properties are of growing interest due to their widespread applications. AIEgens, such as tetraphenylethylene units, display varying emission behaviors during their conformational changes. However, the structure-property relationships of the intermediate conformations have rarely been explored. Herein, the authors show that the conformational restriction on TPE units can affect the structural relaxation in the excited state and the resulting photophys. behaviors. Specifically, three metallacages of different sizes were prepared via the coordination-driven self-assembly of a TPE-based tetrapyridyl donor with length-increasing Pt(II) acceptors. While the metallacages share similar scaffolds, they exhibit a trend of red-shifted fluorescence and attenuated quantum yield with the increase of their sizes. Furthermore, spectroscopic and computational studies together with a control experiment were conducted, revealing that the degree of cage tension imposed on the excited-state conformational relaxation of TPE moieties resulted in their distinct photophys. properties. The precise control of conformation holds promise as a strategy for understanding the AIE mechanism as well as optimizing the photophys. behaviors of materials on the platform of supramol. coordination complexes. After reading the article, we found that the author used Pyridin-3-ylboronic acid(cas: 1692-25-7Electric Literature of C5H6BNO2)
Pyridin-3-ylboronic acid(cas: 1692-25-7) belongs to pyridine. Pyridine is a relatively complex molecule and exhibits a number of different bands in IR spectra. Among others, the bands characterizing the ν8a and ν19b modes have been found to be sensitive to the coordination or protonation of the molecule. Note that the band that is diagnostic for the PyH+ ion at about 1545 cm− 1 (ν19b mode) does not overlap with any of the other bands.Electric Literature of C5H6BNO2