Naveen Mergu

Bio: Naveen Mergu is an academic researcher from Chungnam National University. The author has contributed to research in topics: Metal ions in aqueous solution & Rhodamine. The author has an hindex of 17, co-authored 33 publications receiving 1660 citations. Previous affiliations of Naveen Mergu include Indian Institute of Technology Roorkee.

Selective naked-eye detection of Magnesium (II) ions using a coumarin-derived fluorescent probe

Abstract: A simple 4-Methyl-7-hydroxy-8-formyl Coumarin (CS) serves as a selective chemosensor for Mg 2+ in the presence of alkali and alkaline earth metal ions. It showed a significant fluorescence enhancement towards Mg 2+ . The receptor CS exhibited a good binding constant and lowest detection limit for Mg 2+ . The variation of emission signal exists via of reversible chelation enhanced fluorescence (CHEF) with this inherent quenching metal ion.

A new multifunctional rhodamine-derived probe for colorimetric sensing of Cu(II) and Al(III) and fluorometric sensing of Fe(III) in aqueous media

Abstract: A new rhodamine-derived Schiff base RH was synthesized and its sensing behavior toward various metal ions was investigated by UV–vis and fluorescence spectroscopic techniques The sensor exhibited highly selective and sensitive colorimetric response to Cu2+ and Al3+, and “off–on” fluorescence response toward Fe3+ in semi-aqueous media The spectral changes obtained are large enough in the visible region of the spectrum and thus enable naked-eye detection Experimentally proved that the formation of RH–Al3+ complex is fully reversible and can sense to AcO−/F− via break the complex The results revealed that the sensor offers the sequential detection of Al3+ and AcO−/F−

Comparative study of colorimetric sensors based on newly synthesized Schiff bases

Abstract: New sensitive cation receptors 2a and 2b containing oligoether linked Schiff bases were prepared and their ability to calorimetrically sense transition metal ions was investigated. Addition of metal ions to a methanol solution of 2a, 2b can result in an obvious colour change (from colourless to yellowish-brown for Cu2+ and colourless to yellow for Co2+, Ni2+, Cd2+, Zn2+) and UV–vis absorption spectral change in a short time. The colour change and binding ability of receptors with Cu2+ ion are more compare to other ions, the detection limit is allowable to 1.0 × 10−5 and 1.0 × 10−6 M level of Cu2+, 1.0 × 10−4 and 1.0 × 10−5 M level of Co2+, Ni2+, Cd2+, Zn2+ according to visual colour change and UV–vis spectral change, respectively. This indicated that these two receptors are highly selective for those metal ions over other ions like Ca2+, Mg2+, Mn2+, Hg2+, Cr3+, Fe2+, Pb2+.

A novel optical sensor for copper ions based on phthalocyanine tetrasulfonic acid

Abstract: Phthalocyanine tetrasulfonic acid (PCTS) performed as a optical probe for selective detection of Cu2+ in DMSO solution over other metal ions used The complexation behavior of chemodosimeter toward various metal ions has been studied via UV–vis absorption and fluorescence emission spectra Induced changes were found to be observable from naked eye The association constant (Ka) and low limit of detection were found to be 880 × 105 M−1 and 553 × 10−7 M, respectively The optode showed excellent selectivity behavior in the environmental pH range

Coumarin-Based Small-Molecule Fluorescent Chemosensors.

Abstract: Coumarins are a very large family of compounds containing the unique 2H-chromen-2-one motif, as it is known according to IUPAC nomenclature. Coumarin derivatives are widely found in nature, especially in plants and are constituents of several essential oils. Up to now, thousands of coumarin derivatives have been isolated from nature or produced by chemists. More recently, the coumarin platform has been widely adopted in the design of small-molecule fluorescent chemosensors because of its excellent biocompatibility, strong and stable fluorescence emission, and good structural flexibility. This scaffold has found wide applications in the development of fluorescent chemosensors in the fields of molecular recognition, molecular imaging, bioorganic chemistry, analytical chemistry, materials chemistry, as well as in the biology and medical science communities. This review focuses on the important progress of coumarin-based small-molecule fluorescent chemosensors during the period of 2012-2018. This comprehensive and critical review may facilitate the development of more powerful fluorescent chemosensors for broad and exciting applications in the future.

Selective naked-eye detection of Magnesium (II) ions using a coumarin-derived fluorescent probe

Abstract: A simple 4-Methyl-7-hydroxy-8-formyl Coumarin (CS) serves as a selective chemosensor for Mg 2+ in the presence of alkali and alkaline earth metal ions. It showed a significant fluorescence enhancement towards Mg 2+ . The receptor CS exhibited a good binding constant and lowest detection limit for Mg 2+ . The variation of emission signal exists via of reversible chelation enhanced fluorescence (CHEF) with this inherent quenching metal ion.