A phenothiazine-fused electroactive bilayer helicene: design, synthesis, ACQ-to-AIE transformation and photophysical properties. Issue 13 (10th March 2022)

• Record Type: Journal Article
• Authors: Shivaji, Babar Suraj; Boddula, Rajamouli; Saeki, Akinori; Singh, Surya Prakash
• Is Part Of: Journal of materials chemistry. Volume 10:Issue 13(2022)
• Page Start: 5173
• Page End: 5182
• Publication Date: 2022-03-10
• Subjects: Materials -- Periodicals; Chemistry, Analytic -- Periodicals; Optical materials -- Research -- Periodicals; Electronics -- Materials -- Research -- Periodicals; 543.0284
• DOI: 10.1039/d1tc06090b
• Languages: English
• ISSNs: 2050-7526

Abstract

Abstract : Study of the photophysical, electrochemical and photoconductive properties of SPS-PY-PT and a comparative analysis with PY-PT-Un . In addition, the ACQ and AIE phenomena and time-resolved microwave conductivity (TRMC) are analysed. Abstract : π-Extended helicenes and their derivatives represent green polycyclic aromatic hydrocarbons. Here, we report the design and synthesis of a novel phenothiazine and perylene diimide (PDI)-fused [7]helicene, represented as SPS-PY-PT, to study the aggregation-induced emission (AIE) phenomenon along with its photophysical and electroactive properties. The conventional strategy for AIE uses a twisted molecule or core-connected twisted molecules. However, the present strategy has shown perylene itself as a twisted structure in SPS-PY-PT, which shows effective AIE properties. In contrast, uncyclized PY-PT-Un shows aggregation-caused quenching (ACQ) rather than the AIE phenomenon. Further, the photoconductive properties of SPS-PY-PT were examined by time-resolved microwave conductivity (TRMC). The transient photoconductivity shows a great increase on mixing with a poly-3-hexylthiophene (P3HT) polymer donor, indicating an efficient electron transfer from P3HT to SPS-PY-PT . Electrochemical analyses are conducted and correlated with theoretical calculations. The photophysical and electrochemical data suggest that SPS-PY-PT can be used as an electron acceptor for organic photovoltaics and additionally gives a direction towards AIE-based sensors.