Sivan Velmathi | National Institute of Technology, Tiruchirappalli (original) (raw)

Sivan Velmathi

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Papers by Sivan Velmathi

Research paper thumbnail of Structurally simple dipodalazo linked salicylaldimine as colorimetric sensor for F − and AcO − ion recognition

A dipodal N,Nʹ-bis[4-(benzeneazo)salicylaldehyde)-o-phenylenediamine (receptor 1) has been synthe... more A dipodal N,Nʹ-bis[4-(benzeneazo)salicylaldehyde)-o-phenylenediamine (receptor 1) has been synthesized and characterized using IR, H and C NMR and mass spectroscopic techniques. The anion recognition properties of receptor 1 is investigated using colorimetric, UV-Vis and fluorescence spectroscopic techniques which shows remarkable color and optical changes for only F and AcO ions over other anions such as Cl, Br, H2PO4 − and OH. In presence of F and AcO ions, slight yellow colored solution of receptor 1 is turned into intense yellow color. Also, addition of F and AcO ions to receptor 1 induces the simultaneous decrease and increase in the intensity of absorption band at 345 nm and 455 nm. Further H NMR titration experiment reveals that F ion deprotonates the phenolic OH present in receptor 1 resulting in the formation of HF2 − complex. Receptor 1 showed binding constant values of 7.44×10 and 5.78×10 respectively, and detection limit in the concentration of subnanomolar and micromola...

Research paper thumbnail of Ratiometric Probe for Rapid Naked Eye Detection of Toxic Hydrazine: Real Time Application in Strip Test, Spray Test and Soil Analysis

Journal of Fluorescence, 2021

Research paper thumbnail of ESIPT triggered swift determination of cysteine in HeLa cell line during redox imbalance

Journal of Photochemistry and Photobiology A: Chemistry, 2020

Research paper thumbnail of Turn on fluorescent chemosensor containing rhodamine B fluorophore for selective sensing and in vivo fluorescent imaging of Fe3+ ions in HeLa cell line and zebrafish

Journal of Photochemistry and Photobiology A: Chemistry, 2019

Research paper thumbnail of Coumarin-based Hg2+ fluorescent probe: Fluorescence turn-on detection for Hg2+ bioimaging in living cells and zebrafish

Spectrochimica Acta Part A: Molecular and Biomolecular Spectroscopy, 2019

Research paper thumbnail of A new perylenediimide with NH functionality as a colorimetric and fluorescent probe for the selective detection of trivalent Fe3+ and Al3+ ions

Journal of Photochemistry and Photobiology A: Chemistry, 2017

Research paper thumbnail of Novel ratiometric turn-on fluorescent probe for selective sensing of cyanide ions, effect of substitution and bio-imaging studies

RSC Adv., 2016

Novel fluorogenic receptor, S1 senses highly toxic cyanide ions with typical fluorescent enhancem... more Novel fluorogenic receptor, S1 senses highly toxic cyanide ions with typical fluorescent enhancement via inhibition of TICT process. Bioimaging of RAW264.7 cells and real sample analysis of cyanide ions in the domestic waste water were demonstrated.

Research paper thumbnail of Novel chromogenic selective sensors for aqueous cyanide ions under high water content and real sample analysis

Analytical Methods, 2016

Novel chromogenic receptors (R1–R2) containing anthraquinone as the signalling unit and imidazole... more Novel chromogenic receptors (R1–R2) containing anthraquinone as the signalling unit and imidazole as the binding unit were designed to enhance the sensing action in an aqueous medium.

Research paper thumbnail of Fluorogenic and chromogenic heterocyclic thiourea: Selective recognition of cyanide ion via nucleophilic addition reaction and real sample analysis

Sensors and Actuators B: Chemical, 2015

Research paper thumbnail of A highly fluorescent zinc complex of a dipodal N-acyl hydrazone as a selective sensor for H2PO4− ions and application in living cells

Inorganic Chemistry Frontiers, 2015

A dipodal N-acyl hydrazone receptor (R1) was synthesized in a single step, and utilized as a test... more A dipodal N-acyl hydrazone receptor (R1) was synthesized in a single step, and utilized as a test probe for the selective sensing of metal ions as well as anions.

Research paper thumbnail of Benzodioxole grafted spirooxindole pyrrolidinyl derivatives: synthesis, characterization, molecular docking and anti-diabetic activity

RSC Advances

A highly stereoselective, three-component method has been developed for the synthesis of pyrrolid... more A highly stereoselective, three-component method has been developed for the synthesis of pyrrolidine and pyrrolizidine containing spirooxindole derivatives that exhibits excellent anti-diabetic activity.

Research paper thumbnail of In Vitro, Molecular Docking, and In Silico Binding Mode Analysis of Organic Compounds for Antimicrobial and Anticancer Activity against Jurkat, HCT116, and A549 Cell Lines

Research paper thumbnail of Domino Synthesis of Bis Phenyl Pyrazolone Piperidinium Salt Derivatives

Research paper thumbnail of Covalent-Assembly-Triggered Striking Far-Red to near-Infrared Emitting Fluorescent Probe for Abrupt Detection of Nerve-Agent Mimic (DCP): Real Time Application in Monitoring the Presence of Trace Amounts in Soil and Live Cells

Research paper thumbnail of Near-Infrared-Emitting Probes for Detection of Nanomolar Hydrazine in a Complete Aqueous Medium with Real-Time Application in Bioimaging and Vapor-Phase Hydrazine Detection

ACS Sustainable Chemistry & Engineering

Research paper thumbnail of Naphthalimide based smart sensor for CN−/Fe3+ and H2S. Synthesis and application in RAW264.7 cells and zebrafish imaging

RSC Advances

Probe R designed as tailor-fit triple action smart chemosensor for the sequential detection of CN... more Probe R designed as tailor-fit triple action smart chemosensor for the sequential detection of CN− and Fe3+via colorimetric and fluorometric ‘on–off’ method and H2S through colorimetric method in semi-aqueous conditions.

Research paper thumbnail of Frontispiece: Engineering Metal–Organic Framework Catalysts for C−C and C−X Coupling Reactions: Advances in Reticular Approaches from 2014–2018

Chemistry – A European Journal

Research paper thumbnail of A Simple Red Emitting “Turn-On” Optical Relay Detector for Al3+ and CN−. Application in the Real Sample and RAW264.7 Cell Imaging

Research paper thumbnail of Reinforcement of low-carbon steel against corrosion in acidic condition by some Schiff bases: Experimental and theoretical studies

Research paper thumbnail of Engineering metal‐organic framework catalysts for C‐C and C‐X coupling reactions ‐ advances in reticular approaches from 2014‐2018

Chemistry – A European Journal

Research paper thumbnail of Structurally simple dipodalazo linked salicylaldimine as colorimetric sensor for F − and AcO − ion recognition

A dipodal N,Nʹ-bis[4-(benzeneazo)salicylaldehyde)-o-phenylenediamine (receptor 1) has been synthe... more A dipodal N,Nʹ-bis[4-(benzeneazo)salicylaldehyde)-o-phenylenediamine (receptor 1) has been synthesized and characterized using IR, H and C NMR and mass spectroscopic techniques. The anion recognition properties of receptor 1 is investigated using colorimetric, UV-Vis and fluorescence spectroscopic techniques which shows remarkable color and optical changes for only F and AcO ions over other anions such as Cl, Br, H2PO4 − and OH. In presence of F and AcO ions, slight yellow colored solution of receptor 1 is turned into intense yellow color. Also, addition of F and AcO ions to receptor 1 induces the simultaneous decrease and increase in the intensity of absorption band at 345 nm and 455 nm. Further H NMR titration experiment reveals that F ion deprotonates the phenolic OH present in receptor 1 resulting in the formation of HF2 − complex. Receptor 1 showed binding constant values of 7.44×10 and 5.78×10 respectively, and detection limit in the concentration of subnanomolar and micromola...

Research paper thumbnail of Ratiometric Probe for Rapid Naked Eye Detection of Toxic Hydrazine: Real Time Application in Strip Test, Spray Test and Soil Analysis

Journal of Fluorescence, 2021

Research paper thumbnail of ESIPT triggered swift determination of cysteine in HeLa cell line during redox imbalance

Journal of Photochemistry and Photobiology A: Chemistry, 2020

Research paper thumbnail of Turn on fluorescent chemosensor containing rhodamine B fluorophore for selective sensing and in vivo fluorescent imaging of Fe3+ ions in HeLa cell line and zebrafish

Journal of Photochemistry and Photobiology A: Chemistry, 2019

Research paper thumbnail of Coumarin-based Hg2+ fluorescent probe: Fluorescence turn-on detection for Hg2+ bioimaging in living cells and zebrafish

Spectrochimica Acta Part A: Molecular and Biomolecular Spectroscopy, 2019

Research paper thumbnail of A new perylenediimide with NH functionality as a colorimetric and fluorescent probe for the selective detection of trivalent Fe3+ and Al3+ ions

Journal of Photochemistry and Photobiology A: Chemistry, 2017

Research paper thumbnail of Novel ratiometric turn-on fluorescent probe for selective sensing of cyanide ions, effect of substitution and bio-imaging studies

RSC Adv., 2016

Novel fluorogenic receptor, S1 senses highly toxic cyanide ions with typical fluorescent enhancem... more Novel fluorogenic receptor, S1 senses highly toxic cyanide ions with typical fluorescent enhancement via inhibition of TICT process. Bioimaging of RAW264.7 cells and real sample analysis of cyanide ions in the domestic waste water were demonstrated.

Research paper thumbnail of Novel chromogenic selective sensors for aqueous cyanide ions under high water content and real sample analysis

Analytical Methods, 2016

Novel chromogenic receptors (R1–R2) containing anthraquinone as the signalling unit and imidazole... more Novel chromogenic receptors (R1–R2) containing anthraquinone as the signalling unit and imidazole as the binding unit were designed to enhance the sensing action in an aqueous medium.

Research paper thumbnail of Fluorogenic and chromogenic heterocyclic thiourea: Selective recognition of cyanide ion via nucleophilic addition reaction and real sample analysis

Sensors and Actuators B: Chemical, 2015

Research paper thumbnail of A highly fluorescent zinc complex of a dipodal N-acyl hydrazone as a selective sensor for H2PO4− ions and application in living cells

Inorganic Chemistry Frontiers, 2015

A dipodal N-acyl hydrazone receptor (R1) was synthesized in a single step, and utilized as a test... more A dipodal N-acyl hydrazone receptor (R1) was synthesized in a single step, and utilized as a test probe for the selective sensing of metal ions as well as anions.

Research paper thumbnail of Benzodioxole grafted spirooxindole pyrrolidinyl derivatives: synthesis, characterization, molecular docking and anti-diabetic activity

RSC Advances

A highly stereoselective, three-component method has been developed for the synthesis of pyrrolid... more A highly stereoselective, three-component method has been developed for the synthesis of pyrrolidine and pyrrolizidine containing spirooxindole derivatives that exhibits excellent anti-diabetic activity.

Research paper thumbnail of In Vitro, Molecular Docking, and In Silico Binding Mode Analysis of Organic Compounds for Antimicrobial and Anticancer Activity against Jurkat, HCT116, and A549 Cell Lines

Research paper thumbnail of Domino Synthesis of Bis Phenyl Pyrazolone Piperidinium Salt Derivatives

Research paper thumbnail of Covalent-Assembly-Triggered Striking Far-Red to near-Infrared Emitting Fluorescent Probe for Abrupt Detection of Nerve-Agent Mimic (DCP): Real Time Application in Monitoring the Presence of Trace Amounts in Soil and Live Cells

Research paper thumbnail of Near-Infrared-Emitting Probes for Detection of Nanomolar Hydrazine in a Complete Aqueous Medium with Real-Time Application in Bioimaging and Vapor-Phase Hydrazine Detection

ACS Sustainable Chemistry & Engineering

Research paper thumbnail of Naphthalimide based smart sensor for CN−/Fe3+ and H2S. Synthesis and application in RAW264.7 cells and zebrafish imaging

RSC Advances

Probe R designed as tailor-fit triple action smart chemosensor for the sequential detection of CN... more Probe R designed as tailor-fit triple action smart chemosensor for the sequential detection of CN− and Fe3+via colorimetric and fluorometric ‘on–off’ method and H2S through colorimetric method in semi-aqueous conditions.

Research paper thumbnail of Frontispiece: Engineering Metal–Organic Framework Catalysts for C−C and C−X Coupling Reactions: Advances in Reticular Approaches from 2014–2018

Chemistry – A European Journal

Research paper thumbnail of A Simple Red Emitting “Turn-On” Optical Relay Detector for Al3+ and CN−. Application in the Real Sample and RAW264.7 Cell Imaging

Research paper thumbnail of Reinforcement of low-carbon steel against corrosion in acidic condition by some Schiff bases: Experimental and theoretical studies

Research paper thumbnail of Engineering metal‐organic framework catalysts for C‐C and C‐X coupling reactions ‐ advances in reticular approaches from 2014‐2018

Chemistry – A European Journal

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