Selvakumar R

Department of Mathematics

School of Advanced Sciences

Vellore Campus

Ashok Kumar S-K

Department of Chemistry

Vetriarasu Venkatesan

Suban K.Sahoo

Vellore Institute of Technology (VIT) is a private university located in&nbsp;Tamil Nadu, India. Founded in 1984, as Vellore Engineering College, the institution offers 20 undergraduate, 34 postgraduate, four integrated and four research programs. It has campuses in Vellore, Amravati, Bhopal and Chennai.

VIT is one of the top ranked private universities in India according to NIRF, THE and QS Rankings.&nbsp;Govt. of India has recognized&nbsp;VIT, Vellore as an&nbsp;Institution of Eminence. This has allowed VIT to take independent quality initiatives and move up in world ranking.

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VIT University

Inorganic Chemistry Communications

Highly selective fluorescent chemosensor for the relay detection of Al3+ and picric acid

Highly selective turn-on fluorogenic chemosensor for Zn2+ based on chelation enhanced fluorescence

In this communication, a new multifunctional Schiff-base (S) obtained by reacting hydrazine with 3,5-dichloro-salicylaldehyde. The sensing ability of S was studied with various metal ions by visual test, UV–Vis and spectrofluorometric techniques in THF:H2O (1:1, v/v) media. Accordingly, visual test was confirmed by changing initial colourless solution of S to yellow upon interaction with Mn2+ while for other ions, it did not respond in natural light. However, same solution composition when it was observed under UV light, it exhibits green fluorescent colour with Zn2+. In order to see more photo physical properties of S-Mn2+ and S-Zn2+ are studied through by spectrophotometric and spectrofluorometric methods respectively. Spectrophotometrically, neat S exhibits a strong absorption band at 365 nm upon interaction with Mn2+, it exhibits a new absorption band at 425 nm. Spectroflurometrically, a new emission peak was observed at 500 nm upon excitation of S-Zn2+ at 390 nm while other metal ions did not exhibit any emission properties. Further, the formation 3:2 binding stoichiometry between S with Mn2+ and Zn2+ were studied by using Job's plot and association constant for were estimated by Benesi-Hilderbrand (BH) method. The detection limit of S for Mn2+ and Zn2+ were found to be 3.6 × 10−7 M and 9.2 × 10−8 M respectively, which is much lower than the WHO guidance of their metal ions in drinking water. The coordination behaviour of S with Mn2+ and Zn2+ are well supported by NMR and theoretical calculations. © 2019 Elsevier B.V.

Inorganica Chimica Acta

A multifunctional Schiff-base as chromogenic chemosensor for Mn2+ and fluorescent chemosensor for Zn2+ in semi-aqueous environment

A new antipyrine Schiff's base, 2-((2,5-dimethyl-3-oxo-1-phenyl-2,3-dihydro-1H-pyrazol-4-yl)imino)-1H-indene-1,3(2H)-dione (L) has been synthesized by simple condensation of ninhydrin with 4-aminoantipyrine. The sensing ability of L was studied with selected metal ions from s-block and d-block elements by visual and UV–Vis spectrometry in water: methanol (8:2, v/v) media. The naked-eye detectable colour change of L was occurred from pink to colourless upon interacting with Cr3+ while other metal ions did not change the colour of L. The two main absorption bands appeared at 425 nm and 540 nm of L were quenched upon interaction with Cr3+ while other tested metal ions failed to perturb the absorption bands of L. The Jobs plot and UV–visible spectral studies indicate the formation of a 2:1 complex between the L and Cr3+ with an association constant of 3.0 × 104 M−1. The limit of detection (LOD) of L for the analysis of Cr3+ found to be 5.4 × 10−7 M. The CrL2 complex formation in solution is reversed after treatment with ethylenediaminetetracetic acid (EDTA). The colorimetric sensing ability of Schiff's base L was successfully utilized in the preparation of test paper strips and solid supported silica for the real samples analysis to detect Cr3+ ions from 100% aqueous environment. © 2019 Elsevier B.V.

Development of highly selective chemosensor for chomium(III) estimation in aqueous environment

In this study, tetrabutyl 2,2′-bisbipyridine-5,5′-diylbis(methylene) diphosphonate (L) as fluorescence optical sensor was developed for selective determination of Zn2+.

New Journal of Chemistry

Bipyridine bisphosphonate-based fluorescent optical sensor and optode for selective detection of Zn2+ ions and its applications

Chemical Reviews

Single-Phase White-Light-Emitting and Photoluminescent Color-Tuning Coordination Assemblies

Chemistry - A European Journal

ESIPT-Modulated Emission of Lanthanide Complexes: Different Energy-Transfer Pathways and Multiple Responses

Journal	Data powered by TypesetInorganic Chemistry Communications
Publisher	Data powered by TypesetElsevier BV
ISSN	1387-7003
Open Access	0