Premium
Designing of a β‐Cyclodextrin ‐based supramolecular fluorescent sensor doped with superparamagnetic α‐Fe 2 O 3 nanoparticles with improved light fastness, thermal, and photoluminescent properties
Author(s) -
Philip Sherin,
Kuriakose Sunny,
Mathew Tessymol
Publication year - 2021
Publication title -
journal of applied polymer science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.575
H-Index - 166
eISSN - 1097-4628
pISSN - 0021-8995
DOI - 10.1002/app.51004
Subject(s) - pyrene , fluorescence , thermal stability , cyclodextrin , thermogravimetric analysis , nanoparticle , materials science , supramolecular chemistry , chemistry , quenching (fluorescence) , photochemistry , nuclear chemistry , organic chemistry , nanotechnology , molecule , physics , quantum mechanics
Abstract 1‐Pyrene butyric acid (PBA), a carboxylic derivative of pyrene, which is a well‐studied fluoroprobe, has been greatly used for fluorescent modification of macromolecules belonging to different classes. The present study aimed at the synthesis and characterization of fluorescently modified β‐cyclodextrin (CD) by covalent immobilization of PBA onto supramolecular CD via Steglich esterification. Fluorescently modified CD‐PBA conjugate was further encapsulated with iron (III) oxide nanoparticles (IONP), which belong to the α‐Fe 2 O 3 (hematite) phase. The three systems PBA, CD‐PBA, and CD‐PBA‐IONP were well characterized and compared for their photoresponsive and thermal properties. Photo stability of the samples under study was investigated by exposing the samples to visible light upto 6 h and at regular intervals of time measuring their respective photodegradation by UV/visible spectrophotometry. Thermal properties were monitored using thermogravimetric (TG‐DTG) analysis. Steady state fluorescent studies were performed for the photoluminescent properties. Also, time correlated single photon counting technique was used to measure the fluorescent lifetime of the samples in order to have a better understanding of the quenching mechanism prevailing.