Effect of cyclic third components on non-deoxygenated RTP and their potential in developing optical thermometer

Area of Science:

• Photochemistry
• Supramolecular Chemistry
• Luminescence

Background:

• Cyclodextrin-induced room-temperature phosphorescence (CD-RTP) is a sensitive analytical technique.
• 1-bromonaphthalene is a common phosphorescent probe.
• Understanding the influence of third components is crucial for optimizing CD-RTP.

Purpose of the Study:

• To investigate the effect of five cyclic third components on the CD-RTP of 1-bromonaphthalene.
• To establish the enhancement order of these cyclic compounds.
• To explore the temperature dependence of the CD-RTP systems.

Main Methods:

• Spectroscopic analysis of 1-bromonaphthalene luminescence in the presence of cyclodextrins and various cyclic third components.
• Varying the temperature to observe changes in phosphorescence intensity.
• Comparative analysis of phosphorescence enhancement.

Main Results:

• All five cyclic compounds (cyclohexane, methylcyclohexane, perfluorocyclohexane, perfluoromethylcyclohexane, and adamantane) induced significant RTP.
• The enhancement order was determined as: cyclohexane > adamantane > methylcyclohexane > perfluorocyclohexane > perfluoromethylcyclohexane.
• A clear dependence of RTP intensity on temperature was observed for these systems.

Conclusions:

• Cyclic third components play a vital role in modulating CD-RTP intensity.
• Cyclohexane and adamantane are particularly effective in enhancing the CD-RTP of 1-bromonaphthalene.
• The temperature-dependent phosphorescence suggests potential applications in optical thermometry.