Yamaji Minoru, Mutai Toshiki, Yoshikawa Isao, Houjou Hirohiko, Okamoto Hideki
Division of Molecular Science, Graduate School of Science and Engineering, Gunma University, Ota 373-0057, Gunma, Japan.
Department of Materials and Environmental Science, Institute of Industrial Science, The University of Tokyo, Meguro, Tokyo 153-8505, Japan.
Molecules. 2024 Dec 16;29(24):5941. doi: 10.3390/molecules29245941.
Thanks to recent developments in spectrophotometric instruments, the spectra, quantum yields (Φ), and lifetimes () of photoluminescence from organic and inorganic compounds can be readily determined not only in solution but also in the solid state. It is known that naphthalene emits fluorescence in solution, but not in the solid state. In a previous paper, we reported that solid-state emission can be seen from biaryl compounds comprised of chromophores that show no emission in the solid state. In this work, we prepared diphenylnaphthalenes (DPNs), and the spectra and the Φ and values of fluorescence were determined in solution and the solid state, as well as the crystallographic features. The 2,6-Diphenylnphthalene (26DPN) showed solid-state emission in the wavelength region for longer than those in solution, while the emission spectra of the others in the solid state were similar to those in solution. The crystal structure of 26DPN belonged to a herringbone motif, whereas those of the others were column-stacked structures. Based on these spectroscopic and crystallographic facts, the relationship between the crystal motif and the emission features in the solid state is discussed.
得益于分光光度计仪器的最新发展，有机和无机化合物光致发光的光谱、量子产率（Φ）和寿命（）不仅可以在溶液中，也可以在固态下轻松测定。众所周知，萘在溶液中会发出荧光，但在固态下不会。在之前的一篇论文中，我们报道了由发色团组成的联芳基化合物在固态下可以观察到固态发射，而这些发色团在固态下不发光。在这项工作中，我们制备了二苯基萘（DPN），并测定了其在溶液和固态下的光谱、荧光的Φ值和寿命，以及晶体学特征。2,6-二苯基萘（26DPN）在固态下的发射波长区域比在溶液中的更长，而其他化合物在固态下的发射光谱与在溶液中的相似。26DPN的晶体结构属于人字形图案，而其他化合物的晶体结构是柱状堆积结构。基于这些光谱和晶体学事实，讨论了晶体图案与固态发射特征之间的关系。
