AUTHOR: Dr. Ayyappanpillai Ajayaghosh SRM Institute of Science and Technology, Kattankulathur, Chennai (India)

WHEN: March, 13 - 12PM

WHERE: Salón de Actos, ICMM

INVITED BY: Amparo Ruiz Carretero

ABSTRACT: Integration of photoresponsive units into p-systems are meant to address key challenges in developing responsive and adaptive soft functional materials that dynamically respond to light. Photoresponsive dynamic supramolecular systems are one of the preferred choices in the emerging domain of smart materials, particularly in the field of photonics and nanoarchitectonics. Our expertise in supramolecular chemistry and photochemistry helped us in the construction of small molecules based supramolecular assemblies1,2 for energy transfer,3,4 chiral inversion,5 morphology modulation6 and device application.7 Recently we have shown that photocycloaddition and photoisomerization reactions can be applied to modulate the Lower Critical Solution Temperature (LCST) of molecular assemblies8 for the construction of smart windows that can regulate the heat generating near-IR and IR radiations.9-11 LCST phenomenon is a thermoresponsive property exhibited by amphiphilic polymers and small molecular p-systems which can be modulated by incorporating photoresponsive moieties. This talk is mainly focused on the use of photoisomerization and photocyclization reactions to modulate LCST property of p-systems for their application in the construction of energy saving smart windows.

References

  1. S. S. Babu, V. K. Praveen, A. Ajayaghosh, Chem. Rev. 2014, 114, 1973.
  2. V. K. Praveen, B. Vedhanarayanan, A. Mal, R. K. Mishra, A. Ajayaghosh, Acc. Chem. Res. 2020, 53, 496.
  3. V. K. Praveen, S. J. George, R. Varghese, C. Vijayakumar, A. Ajayaghosh, J. Am. Chem. Soc.2006, 128, 7542.
  4. A. Ajayaghosh, V. K. Praveen, C. Vijayakumar, S. J. George, Angew. Chem. Int. Ed. 2007, 46, 6260. 
  5. A. Gopal, M. Hifsudheen, A. Ajayaghosh, Angew. Chem. Int. Ed. 2012, 51, 10505.
  6. S. Mahesh, A. Gopal, R. Thirumalai, A. Ajayaghosh, J. Am. Chem. Soc. 2012, 134, 7227.
  7. S. Das, N. Okamura, S. Yagi, Ajayaghosh, J. Am. Chem. Soc. 2019, 141, 5635.
  8. S. Das, A. Ajayaghosh, Small, 2025, e07210
  9. S. Das, D. Patra, S. Shankar, A. Ajayaghosh, Angew. Chem. Int. Ed. 2022, 61, e202207641.
  10. D. Patra, S. Das, S. Shankar, A. Ajayaghosh, Adv. Funct. Mater. 2024, 2408014.
  11. D. Patra, R. D. Mukhopadhyay, A. Ajayaghosh, Angew. Chem. Int. Ed. 2025, 66, e202517868