Room Temperature Phosphorescent (RTP) N-Acetylphenothiazines

Sarkar, TK and Sarkar, SK and Thilagar, P (2020) Room Temperature Phosphorescent (RTP) N-Acetylphenothiazines. In: ChemPhotoChem, 4 (4). pp. 282-286.

PDF che_pho_che_4-4_282-286_2020.pdf - Published Version Restricted to Registered users only Download (1MB) | Request a copy

Abstract

Herein we disclose a series of purely organic molecules (1–4) with a donor-acceptor architecture (phenothiazine donor (D) and the acyl acceptor (A)) exhibiting room temperature dual phosphorescence (RTDP) characteristics. Detailed computational and photophysical studies revealed that the dual RTP bands with different wavelengths and lifetimes in these compounds originate from excited triplet states of different energies. In particular, the electronic nature of the substituent on the acceptor acyl unit has a significant effect on the energy of the ICT state, hybridization of excited states, as well as the rate of intersystem crossing. Compound 1 with an electron-deficient CF3−CO acceptor moiety exhibit RTDP in the longer wavelength region. In contrast, compounds 2, 3 and 4 with weaker acceptors (2; CH3−CO, 3; CH3−CH2−CO and 4; (CH3)2−CH−CO) exhibit RTDP in a shorter wavelength region

Item Type:	Journal Article
Publication:	ChemPhotoChem
Publisher:	Wiley-VCH Verlag
Additional Information:	The copyright for this article belongs to the Wiley-VCH Verlag.
Keywords:	charge transfer; donor-acceptor systems; intersystem crossing; phenothiazine; room temperature phosphorescence
Department/Centre:	Division of Chemical Sciences > Inorganic & Physical Chemistry
Date Deposited:	01 Feb 2023 08:49
Last Modified:	01 Feb 2023 08:49
URI:	https://eprints.iisc.ac.in/id/eprint/79667

Actions (login required)

View Item