Visual Simultaneous Detection and Real-Time Monitoring of Cadmium Ions Based on Conjugated Polydiacetylenes

Thanh Chung Pham; Seongman Lee; Dongwon Kim; Ok-Sang Jung; Myung Won Lee; Songyi Lee

doi:10.1021/acsomega.0c04636

Visual Simultaneous Detection and Real-Time Monitoring of Cadmium Ions Based on Conjugated Polydiacetylenes

ACS Omega. 2020 Nov 23;5(48):31254-31261. doi: 10.1021/acsomega.0c04636. eCollection 2020 Dec 8.

Authors

Thanh Chung Pham¹, Seongman Lee¹, Dongwon Kim², Ok-Sang Jung², Myung Won Lee³, Songyi Lee^{3

1}

Affiliations

¹ Interdisciplinary Program of Biomedical, Mechanical and Electrical Engineering, Pukyong National University, Busan 48513, Korea.
² Department of Chemistry, Pusan National University, Busan 46241, Korea.
³ Department of Chemistry, Pukyong National University, Busan 48513, Korea.

Abstract

We prepared the monomer PCDA-HP composed of 5-hydroxy-N ¹,N ³-bis(pyridin-2-ylmethyl)isophthalamide (HP) as a cadmium ion tweezer and then polymerized them to form a polydiacetylene (PDA)-based sensor (PDA-HP), which displayed selective and sensitive colorimetric and fluorometric change upon addition of a cadmium ion (Cd²⁺) at both pH 7.4 and 6.8. The PDA-HP polymer was highly selective for Cd²⁺ over other metal ions with colorimetric change. In addition, the PDA-HP chemosensor also showed a red fluorescence change in the presence of Cd²⁺ at both pH 7.4 and 6.8. Naked-eye detection of Cd²⁺ was accomplished in an aqueous solution through a PDA-based sensor system. Finally, the lowest energy structure of an HP chelator was obtained by the crystal structure and density functional theory (DFT) calculations.