Polydiacetylenes Containing 2‐Picolylamide Chemosensor for Colorimetric Detection of Cadmium Ions

Abstract

This article describes the preparation and analysis of Cd 2+-sensing polydiacetylene-based chemosensors (PDA-MP). Polydiacetylenes (PDAs), a family of conjugated polymers, exhibit a strong response to external stimuli. Accordingly, we have designed a novel PDA sensor, which is linked to mono 2-picolylamine, to increase the PCDA-MP monomer content in polymer system. As a result, it enhanced sensitivity toward Cd 2+ with the low detection limit (2.10 μM) in aqueous solution. Our sequential modification of chelate structure improved the Cd 2+-sensing ability of PDAs. Finally, the interaction between PCDA-MP and Cd 2+ was confirmed by Raman spectroscopy, Field Emission Scanning Electron Microscopes (FE-SEM), and Proton nuclear magnetic resonance (1 H NMR).

Recent Strategies to Develop Innovative Photosensitizers for Enhanced Photodynamic Therapy

“…Conjugated polymers (CPs) are π-conjugated macromolecules with delocalized-π-electronic systems along the polymer chain. − Because of extended conjugation, CPs showed high absorption coefficient, bright fluorescence, photostability, but are hydrophobic. Therefore, they have been intensively applied in biosensor, bioimaging, and drug delivery after appropriate modifications by incorporating with cationic, anionic, or polar units on the side chains .…”

Polydiacetylene-based sensors for food applications

“…To further increase the sensitivity, the authors designed the PDA-based sensor with different DA monomer compositions by using mono 2-picolylamine (MP) as a head group modification on PCDA (PCDA-MP). 60 This led to an increase in Cd 2+ sensitivity with a LOD of 2.1 μM while retaining the high selectivity of the PDA sensors to other metal ions. For the detection of Pb 2+ , recognition moieties such as dopamine, 61 galloyl, 62 1-aza-18-crown-6-ether, 63 and glycine 64 have been incorporated into PDA-based sensors for selective and sensitive detection of Pb 2+ at as low as 0.24 μM.…”