Synthesis of a new bimetallic Re(I)–NCS–Pt(II) complex as chemodosimetric ensemble for the selective detection of mercapto-containing pesticides

Cheuk Fai Stephen CHOW, Cheng-Bin GONG, Yat Fung HO

Research output: Contribution to journalArticle

15 Citations (Scopus)

Abstract

Detection of mercapto-containing pesticides plays a crucial role in food and water safety. A new Re(I)–NCS–Pt(II) complex, [Re(4,4′-di-tert-butyl-2,2′-bipyridine)(CO)3(NCS)]–[Pt(DMSO)(Cl)2] (1), was synthesized and characterized. The synthetic procedure, characterization results, and photophysical data for 1 are reported in this paper. Solvated complex 1 demonstrated luminescent chemodosimetric selectivity for phorate, demeton, and aldicarb (three common mercapto-containing pesticides) with method detection limits (MDLs) of 1.00, 2.87, and 2.08 ppm, respectively. The binding constants (log K) of 1 toward them were in the 3.24–3.44 range. The analyte selectivity of the complex was found to be dependent on the bridging linkage (C≡N and N═C═S) between the Re(I) and Pt(II) centers. The solid-supported dosimetric device 1 was fabricated by blending complex 1 with Al2O3 and poly(vinyl chloride) (PVC) powder. The MDLs of the device toward the mercapto-containing pesticides were 0.48–0.60 ppm. The device was applicable to pesticides in real water bodies such as taps, rivers, lakes, and underground water bodies with excellent recoveries and relative standard deviations of 76.2–108.0% and 2.9–6.7%, respectively. Its spectrofluorimetric changes could be analyzed by naked eye within 20 min with a linear luminometric response toward increases in the phorate concentration (0–8.0 ppm) with R = 0.999. Copyright © 2015 American Chemical Society.
Original languageEnglish
Pages (from-to)6112-6118
JournalAnalytical Chemistry
Volume87
Issue number12
Early online dateJun 2015
DOIs
Publication statusPublished - 2015

Fingerprint

Pesticides
Phorate
Disulfoton
Aldicarb
Vinyl Chloride
Water
Carbon Monoxide
Dimethyl Sulfoxide
Polyvinyl Chloride
Powders
Lakes
Groundwater
Rivers
Recovery

Bibliographical note

Chow, C.-F., Ho, K. Y.-F., & Gong, C.-B. (2015). Synthesis of a new bimetallic Re(I)–NCS–Pt(II) complex as chemodosimetric ensemble for the selective detection of mercapto-containing pesticides. Analytical Chemistry, 87(12), 6112-6118.