Designing of a β‐Cyclodextrin‐based supramolecular fluorescent sensor doped with superparamagnetic α‐Fe2O3 nanoparticles with improved light fastness, thermal, and photoluminescent properties. Issue 39 (20th May 2021)

• Record Type: Journal Article
• Authors: Philip, Sherin; Kuriakose, Sunny; Mathew, Tessymol
• Is Part Of: Journal of applied polymer science. Volume 138:Issue 39(2021)
• Page Start: n/a
• Page End: n/a
• Publication Date: 2021-05-20
• Subjects: magnetism and magnetic properties -- molecular recognition -- photochemistry; Polymers -- Periodicals; Polymerization -- Periodicals; 668.9
• DOI: 10.1002/app.51004
• Languages: English
• ISSNs: 0021-8995

Abstract

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‐Fe2 O3 (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. Abstract :