A Selective Colorimetric and Fluorometric Chemosensor Based on Conjugated Polydiacetylenes for Cadmium Ion Detection

Abstract

In the current study, a polydiacetylene (PDA)-based sensor, derived from a chelidamic acid-picolylamine (CP)-substituted diacetylene monomer, displayed a selective colorimetric and fluorometric change in the presence of cadmium (Cd 2 + ) at pH 7.4. The PDAÀ CP solutions showed a colorimetric change from blue to violet in response to various amounts of Cd 2 + . The chemosensor also showed a rapid fluorescence turn-on response and significant selectivity to Cd 2 + compared with other metallic cations. The Cd 2 + -selective PDA-based sensor system facilitated the visual detection of Cd 2 + in aqueous solution. The Cd 2 + detection limit of PDAÀ CP was reduced to 1.85 × 10 À 5 M.

A naphthalimide-based turn-on fluorescence probe for peroxynitrite detection and imaging in living cells

“…Fluorescent technique is indispensable in biological imaging. [9][10][11][12][13][14][15][16] Because of high selectivity, rapid response and low toxicity, uorescent probes have been developed for a wide range of substrates, including ONOO À . [17][18][19][20][21][22][23] Qian's group developed a near-infrared uorescent probe ONP to track endogenous ONOO À in brains of kainate-induced epileptic seizures.…”

Co-solvent polarity tuned thermochromic nanotubes of cyclic dipeptide–polydiacetylene supramolecular system

“…Owing to the non-covalent interactions promoted self-assembled structure, PDAs exhibit colorimetric (typically blue-to-red) and optical transitions in response to external stimuli, and these unique properties of PDAs have been extensively applied for sensing applications. [33][34][35][36][37][38][39][40][41][42][43][44] In addition, a wide array of structural morphologies of PDAs can be constructed by the precise introduction of head groups to DAs. [45][46][47][48][49][50] Cyclic dipeptides (CDPs) are the simple cyclic peptide scaffolds with a rigid 2,5-diketopiperazine (DKP) as a basic skeleton, and generally explored as a versatile scaffolding component in the eld of supramolecular chemistry.…”

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

“…3 For that reason, various analytical methods have been developed to detect Cd 2+ using fluorescent and colorimetric sensors. 4 However, the selective recognition of cadmium compared with zinc and mercury ions is a challenge because of their closed-shell d 10 electronic configurations. 5 In this regard, we developed highly selective and sensitive chemosensor based on polydiacetlyenes (PDAs) for visual detection of Cd 2 + .…”

“…9 In a previous study, we prepared PCDA-CP, a diacetylene monomer consisting of chelidamic acid and 2picolylamine, which recognize Cd 2+ under specific conditions with comparable low detection limit. 10 We developed another diacetylene monomer (PCDA-HP) with remarkable selectivity. 11 The PCDA-HP monomer was deficient in a single nitrogen compared to PCDA-CP and decreased the chelating ability with another metal (Figure 1.).…”