Exploring the photophysics of curcumin in zwitterionic micellar system: An approach to control ESIPT process in the presence of room temperature ionic liquids (RTILs) and anionic surfactant

Chiranjib Banerjee, Surajit Ghosh, Sarthak Mandal, Jagannath Kuchlyan, Niloy Kundu, Nilmoni Sarkar

Research output: Contribution to journalArticlepeer-review

22 Scopus citations

Abstract

In this manuscript, we have modulated the photophysical properties of curcumin in a zwitterionic (N-hexadecyl-N,N-dimethylammonio-1-propanesulfonate (SB-16)) micellar aggregates with addition of room temperature ionic liquids (RTILs) as well as commonly used anionic surfactant (SDS), using steady-state and time-resolved spectroscopic techniques. To modulate the photophysics, first we studied its interaction with an SB-16 micellar system, then to further exploit its photophysics, three RTILs (EmimES, EmimBS, EmimHS) with variation of alkyl chain lengths as well as SDS were used. It is observed that the rate of degradation of curcumin is drastically decreased after partitioning into the zwitterionic micellar system. It is shown that the dynamics of excited state intramolecular proton transfer (ESIPT) processes can be controlled by using those RTILs and SDS. Our study also reveals that the hindrance of nonradiative processes of curcumin, i.e., ESIPT is more pronounced in the case of RTIL containing a long alkyl chain compared to a small one. However, most interestingly the addition of long chain (dodecyl) anionic surfactant (SDS) promotes the ESIPT process of curcumin. We have also studied the effect of the addition of inorganic salt and compared the results with RTILs. The present work demonstrates an effort to decipher the photophysics of curcumin in zwitterionic micellar systems by monitoring its excited state dynamics.

Original languageEnglish (US)
Pages (from-to)3669-3681
Number of pages13
JournalJournal of Physical Chemistry B
Volume118
Issue number13
DOIs
StatePublished - Apr 3 2014

Fingerprint Dive into the research topics of 'Exploring the photophysics of curcumin in zwitterionic micellar system: An approach to control ESIPT process in the presence of room temperature ionic liquids (RTILs) and anionic surfactant'. Together they form a unique fingerprint.

Cite this