Title
Color tuning of cationic pyrene derivatives on a clay nanosheet: Retardation of gradual redshift on clay
Author
Daiki Morimoto, Keita Sato, Kenji Saito, Masayuki Yagi, Shinsuke Takagi, Tatsuto Yui
Year
2017
Journal
Journal of Photochemistry and Photobiology A: Chemistry
Abstract
A novel type of trimethylanilinium-substituted pyrene derivative, 1,6-di(N,N,N-trimethylanilinium-4-yl)pyrene 2I− (An–Py2+), was synthesized. An–Py2+ exhibits strong emission with a high-emission quantum yield (approximately 90%) in aqueous solution. An–Py2+ was hybridized on a clay (Sumecton SA (SSA)) surface, and the photochemical behavior of An–Py2+ on the SSA surface was investigated using absorption and emission spectroscopic analyses, emission quantum yield (Φf), and lifetime (τ) measurements. Effective adsorption of An–Py2+ on SSA was observed, and adsorption limit was estimated to be 100% relative to the cation-exchange capacity (CEC) of SSA. The previously reported pyridinium-substituted pyrene derivatives cause a gradual redshift of both absorption and emission on the SSA surface. In contrast, An–Py2+ effectively suppresses such a redshift on SSA due to anilinium substitution of the pyrene unit.
Instrument
FP-6300
Keywords
Fluorescence, Materials, Quantum yield