Inkjet-printed phosphorescent Iridium(III) complex based paper sensor for highly selective detection of Hg2+. (April 2019)

• Record Type: Journal Article
• Authors: Ponram, Marimuthu; Balijapalli, Umamahesh; Sambath, Baskaran; Kulathu Iyer, Sathiyanarayanan; Kakaraparthi, Kranthiraja; Thota, Giridhar; Bakthavachalam, Venkatachalapathy; Cingaram, Ravichandran; Sung-Ho, Jin; Natesan Sundaramurthy, Karthikeyan
• Is Part Of: Dyes and pigments. Volume 163(2019)
• Page Start: 176
• Page End: 182
• Publication Date: 2019-04
• Subjects: Dyes and dyeing -- Periodicals; Pigments -- Periodicals; 667.2
• DOI: 10.1016/j.dyepig.2018.11.054
• Languages: English
• ISSNs: 0143-7208

Abstract

Abstract: First of its kind inkjet-printed phosphorescent Iridium(III) complex [Ir(TPQ)2 (4-EO2 -pic)] paper based chemosensor has been developed for Hg 2+ ions. The probe is highly selective towards mercury analyte over other metal ions (Cu 2+, Ca 2+, Co 2+, Cd 2+, Pb 2+, Zn 2+, Ni 2+, Mg 2+, Mn 2+, Al 3+, Fe 3+, La 3+, Ag +, K +, Na + and Li + ). [Ir(TPQ)2 (4-EO2 -pic)] complex solution gave a visible color change from orange to yellow and significant phosphorescence quenching. Upon addition of aqueous Hg 2+, the [Ir(TPQ)2 (4-EO2 -pic)] inkjet-printed paper gave a significant color change in both normal and UV light. The detection limit was found out as 1.78 × 10 −8 M. Cyclic voltammetry (CV) studies were conducted to explore the further utility of [Ir(TPQ)2 (4-EO2 -pic)] as electrochemical sensor for Hg 2+ ions in CH3 CN/H2 O (v/v = 1/1). The oxidation wave intensity of [Ir(TPQ)2 (4-EO2 -pic)] at 0.98 V decreased and new reversible oxidation wave was appeared at 0.91 V The binding ratio of the [Ir(TPQ)2 (4-EO2 -pic)]-Hg 2+ complex was determined to be 1:1 according to the Job's Plot. The probable binding modes of these [Ir(TPQ)2 (4-EO2 -pic)] with Hg 2+ have also been suggested on the basis of the 1 H NMR titration, absorption and luminescence studies. Graphical abstract: Highlights: First of its kind ink-jet printed phosphorescent chemosensor (IJPCS). [Ir(TPQ)2 (4-EO2 -pic)] complex showed high Hg 2+ selectivity both in aqueous CH3 CNH2 O (1:1 V/V) and in printed paper strips. The detection limit was calculated as 1.78 × 10 −8 M.