Please use this identifier to cite or link to this item: http://localhost:8080/xmlui/handle/123456789/4113
Title: Photocycloaddition as a Tool for Modulation of the Lower Critical Solution Temperature in a Molecular π‐System to Control Transmission of Solar Radiation
Authors: Das, S
Patra, D
Shankar, S
Ajayaghosh, A
Keywords: Photocycloaddition
Molecular π-System
Solar Radiation
Issue Date: 26-Aug-2022
Publisher: Wiley
Citation: Angewandte Chemie International Edition;61: e202207641.
Abstract: Diels–Alder photocycloaddition, a well-known textbook reaction, has not been explored in materials chemistry. Herein we describe how this classical photochemistry can be used to modulate the lower critical solution temperature (LCST) of a molecular π-system, which can further be exploited for the controlled transmission of solar radiation for the management of indoor heat and light. An amphiphilic anthracene derivative 9-PA-1 exhibited LCST behavior at 27–32 °C with a reversible transition from a transparent to an opaque phase in water (1–5 mM). Irradiation of a toluene solution of 9-PA-1 with 365 nm light resulted in a [4+2] photocycloadduct 9-PA-2, which exhibited a modulated LCST behavior at 25–27 °C, at a concentration as low as 6 μM. The photocycloaddition of 9-PA-1 was significantly retarded in water, making it a stable candidate for the design of sustainable smart windows. We also demonstrated 100 cm2 smart window prototypes (ΔTlum 82 %, ΔTIR 68 %, ΔTsol 73 %) with more than 1000 cycles of stable operation.
Appears in Collections:2022

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