Design and synthesis of metal free organic room temperature phosphorescent molecules

Abstract

Currently, the researchers are interested in the development of phenothiazine-based room temperature phosphorescent (RTP) molecules owing to their long-lived lifetime and have excellent phosphorescence characteristics at room temperature. The main aim of this thesis to design and synthesize phenothiazine-based room temperature phosphorescent molecules. The molecules BT-PTZ-PTZ and BT-PTZ-PTZO, comprised of benzothiazole, phenothiazine and phenothiazine oxide moieties, were synthesized by well-known Buckwald-Hartwig cross coupling reactions. The solvatochromism was performed to support the donor-acceptor character in the molecules, which showed significant red shift with different polarity of solvents. Further, the solid-state emission was recorded for the compound BT-PTZ-NPTZ and BT-PTZ-NPTZO and it was found that the both the compounds being highly emissive in solid state that encouraged to perform the solid-state emission. Both the compounds were characterised by various analytical techniques such as 1H and 13C NMR spectroscopy and mass spectrometry.