Absorption spectra of 1-methylnaphthalene, anthracene, pyrene, and perylene in the liquid phase

• Published in: Chemical physics letters Vol. 844; p. 141263
• Main Authors: Katoh, Ryuzi, Kubota, Haruyoshi, Sugawara, Kazuma
• Format: Journal Article
• Language: English
• Published: Elsevier B.V 01.06.2024
• Subjects: Absorption spectra of molten aromatic liquids; Dimer formation; Absorption spectra of molten aromatic liquids; Dimer formation
• ISSN: 0009-2614
• DOI: 10.1016/j.cplett.2024.141263

[Display omitted] •Absorption spectra of molten liquids of anthracene, pyrene, and perylene were measured.•Absorption spectra of molten liquids are similar to those in solution phase.•Molecular electronic state is preserved to some extent in the liquid phase.•Slight difference in the shapes of the spectra between liquids and solutions is seen.•Sandwich-type dimers state coexist with isolated monomers in molten liquids. We studied absorption spectra of aromatic liquids to understand exitonic property and molecular configuration. We measured the absorption spectra of 1-methylnaphthalene liquid at room temperature, and of anthracene, pyrene, and perylene liquids in the molten state at just above their melting points. The absorption band positions were similar to those seen in the spectra obtained with the compounds in solution, indicating that the electronic structure as an isolated molecule is preserved to some extent in the liquid phase. For anthracene, pyrene, and perylene liquids, characteristic differences in the shapes of the spectra compared with the spectra of the compounds in solution were observed. In fact, absorbance in the shorter wavelength region of the absorption bands was pronounced in the spectra for the liquids, indicating that a sandwich-type dimer in the ground state coexist with isolated monomers in these liquids.