A novel cation ensembled fluorescent organic nanoparticle for selective detection of organophosphorus insecticides. (April 2017)

• Record Type: Journal Article
• Authors: Kaur, Rajinder; Kaur, Navneet
• Is Part Of: Dyes and pigments. Volume 139(2017)
• Page Start: 310
• Page End: 317
• Publication Date: 2017-04
• Subjects: Rhodamine -- Fluorescent -- Chemosensor -- Azinphos methyl -- Cation displacement; Dyes and dyeing -- Periodicals; Pigments -- Periodicals; 667.2
• DOI: 10.1016/j.dyepig.2016.12.032
• Languages: English
• ISSNs: 0143-7208

Abstract

Abstract: Rhodamine appended thiourea/urea probes1 and2 have been designed and synthesized using simple chemical route. The ligands1 and2 are hydrophobic in nature and were processed into organic nanoparticles (L1-2 ), which remained stable in aqueous medium. The organic nanoparticles have exhibited reasonable fluorescence emission, which remained unperturbed upon addition of a good range of organophosphates. However when assessed with various cations in buffered aqueous solution;L1 gave significant enhancement with chromium ion; on the contraryL2 was non-selective. Further, L1.Cr(III) complex selectively detects azinphos methyl even in the presence of other organophosphates through cation displacement assay. Addition of azinphos methyl to the solution ofL1.Cr(III) leads to the modulation of the fluorescence intensity and thus original emission intensity ofL1 is restored. The detection limit of azinphos methyl is 1.73 nM. In addition, a metallic sheet precoated with silica was utilized for sensing of azinphos methyl. Real sample analysis of tap water, river water was executed to analyse the practical applicability of the sensor. Graphical abstract: Highlights: Rhodamine based organic ligands were synthesized and processed into organic nanoparticles (L1 /L2 ) in DMSO:H2 O (1:99, v/v). L1 displayed selectivity for Cr(III) ion whereasL2 is non-selective. L1.Cr(III) complex detects azinphos methyl besides other organophosphates through cation displacement assay. Real sample analysis was done in tap and river water and strip test was executed for on-site sensing of azinphos methyl.