| Summary: | 碩士 === 國立臺灣科技大學 === 化學工程系 === 105 === The target of my research is to synthesize a series of molecules with Large Stokes shift and no solvent effect. It is known from the previous literature that the conjugation of anthracene is better than that of benzene and naphthalene, and the conjugation of 2,6-diarylanthracene is better than 9,10-diarylanthracene. However, since the molecular configuration of 2,6-diarylanthracene in the ground state and the excited state is not large, it can not produce Large Stokes shift. Therefore, we use 1,4-di(thien-2-yl)anthracene skeleton as a core, and extend it linearly to three, five or seven conjugated aromatic rings.
This research synthesizes four parts of the compounds. Respectively, 1,4-di(thien-2-yl)naphthalene skeleton as the core, 9,10-di(thien-2-yl)anthracene skeleton as the core, 1,4-di(thien-2-yl)anthracene skeleton as the core and 1,4-di(thien-2-yl)anthracene skeleton as the core with electron donating and withdrawing group. The purpose is to compare the conjugation and the solvent effect with the 1,4-di(thien-2-yl)anthracene molecules.
Finally, we use instruments to measure the photophysical properties of molecular absorption spectra, emission spectra, fluorescence quantum yield, extinction coefficient and HOMO / LUMO. Discuss the relationship between the Large Stokes shift and the conjugated molecular structure.
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