Simple and Highly Sensitive Electrochemical Sensor for Sunset Yellow Detection Based on Co3O4/g-C3N4 Nanocomposite Modified Gold Electrode Sumi Sundaresan, Subramanian Sowmya, Vijendran Vijaikanth Chemistryselect, 2024 Sunset Yellow (SY) is an azo dye used in various food and pharmaceutical industries that deserves special attention because of its allergic and carcinogenic properties. Recently, electrochemical techniques have come to the spotlight because of their high sensitivity, simplicity and rapidity as compared to other techniques. In this work, we have developed a cost‐effective and stable electrochemical sensor by a simple method using Vitamin B12‐derived cobalt oxide coupled with g‐C3N4 (V12‐CoO/gCN) modified Au electrode. The composite prepared for the sensor was characterized using techniques such as FTIR, Powder XRD, SEM analysis, EDAX, and mapping. For electrochemical sensing of the dye Sunset Yellow, CV, DPV, and LSV techniques have been used, out of which DPV shows a better detection limit of 1.39 nM followed by LSV and CV that displayed detection limits of 3.3 nM and 4.14 nM respectively. When 5 real samples obtained from the local market are analyzed using the DPV technique, the detection limit is obtained in the range between 2.1 nM and 6.9 nM. This method leads to the development of an electrochemical sensor for the detection of Sunset Yellow to get a lower detection limit that can be used in food toxicology and related fields.
A Bifunctional Novel Bipyridine Bridged Dicobaloxime Complex for Electrochemical Proton Reduction and Toxic Metanil Yellow Dye Detection Sumi Sundaresan, Subramanian Sowmya, Vijendran Vijaikanth Chemistryselect, 2024 A new bipyridine bridged dicobaloxime complex BrCo(dpgh)2(4,4’‐bipyridine)Co(dpgH)2Br was synthesized and characterized by standard spectroscopic techniques. The synthesized complex was employed as an electrocatalyst for the proton reduction in the presence of acetic acid as an acid source. The catalytic efficiency was calculated to be 0.379. Subsequently the nanocomposite of the complex was prepared with g‐C3N4 nanosheet by hydrothermal method and the composite material was characterized by standard physical characterization techniques. When the nanocomposite was employed as a catalyst for electrochemical sensing of toxic food color Metanil yellow dye using gold electrode, the LOD value was found to be 0.09 nM. These studies show that the dicobaloxime acts as a bifunctional catalyst towards electrochemical proton reduction and for the detection of Metanil yellow dye.
Synthesis, characterization, X-ray crystal structures and antibacterial properties of cobaloximes with aniline based ligands containing acid functionality S. Boopalan, Aneesha Antony, Nienu Susan Loyid, V. Vijaikanth, S. Murugan Inorganic and Nano Metal Chemistry, 2024 Cobaloximes of the type [Co(X)(dmgH)2B], where dmgH = Dimethylglyoxime monoanion, X = Cl−, Br−, SCN− and B = 4-Aminophenylacetic acid (4-APAA) and4-Aminobenzoic acid (4-ABA), have been synthesized. Better yield was obtained when bromide ion was used as an axial ligand. The synthesized cobaloximes were characterized by IR, UV spectroscopy and cyclic voltammetry. The structures of the two cobaloximes [Co(Cl)(dmgH)2(4-ABA)] and [Co(Br)(dmgH)2(4-ABA)] have been characterized by X-ray Crystallography. The complexes were screened for their antibacterial activity against gram positive Methicillin Resistant Staphylococcus aureus (MRSA) MTCC 1430 and gram negative Acinetobacter baumannii MTCC 1425 bacteria using Agar well diffusion method, Tube method and Biofilm eradication on biomaterial methods. It has been found that all the cobaloxime complexes exhibited inhibition against both the test microorganisms. Cobaloximes have been found to be more active against the gram negative bacteria compared to gram positive bacteria.
g-C3N4/Chlorocobaloxime Nanocomposites as Multifunctional Electrocatalysts for Water Splitting and Energy Storage Subramanian Sowmya, Vijendran Vijaikanth ACS Omega, 2023 Due to environmental contamination and the depletion of energy supplies, it is very important to develop low-cost, high-performance, multifunctional electrocatalysts for energy conversion and storage systems. Herein, we report the development of cost-effective modified electrodes containing g-C3N4/chlorocobaloxime composites (C1–C4) and their electrocatalytic behavior toward the hydrogen evolution reaction (HER) and the oxygen evolution reaction (OER), followed by their energy-storage applications. A series of chlorocobaloximes {ClCo(dpgH)2B} with diphenylglyoxime (dpgH) and neutral bases (B) containing a carboxylic acid moiety (isonicotinic acid, pyridine-3,5-dicarboxylic acid, indole-2-carboxylic acid, and p-aminobenzoic acid) have been synthesized and characterized by spectroscopic techniques. The nanocomposites of g-C3N4/chlorocobaloximes are prepared and characterized by Fourier transform infrared (FTIR) spectroscopy, ultraviolet–visible diffuse reflectance spectroscopy (UV-DRS), X-ray diffraction (XRD), scanning electron microscopy (SEM), transmission electron microscopy (TEM), high-resolution TEM (HRTEM), X-ray photoelectron spectroscopy (XPS), particle size distribution analysis (PSA), Brunauer–Emmett–Teller (BET), and energy dispersive X-ray analysis (EDAX) techniques. The composite coatings exhibit enhanced HER performance at lower overpotential and with a lower Tafel slope. When the water-splitting reactions are studied using 0.5 M H2SO4 and 0.5 M KOH as electrolytic solutions, the composite g-C3N4/C2 containing pyridine-3,5-dicarboxylic acid as a neutral base shows excellent HER activity with a lower overpotential of 173 mV at −10 mA cm–2 and OER activity with a lower overpotential of 303 mV. The HER reaction takes place through the Volmer–Heyrovský mechanism, where the desorption step is the rate-determining step. Among the synthesized nanocomposites, the nanocomposite g-C3N4/C2 shows higher efficiency toward both HER and OER reactions, with a lower Tafel slope of 55 mV dec–1 for HER and 114 mV dec–1 for OER than the other nanocomposites. The overall water-splitting studies of the composite g-C3N4/C2 in 0.5 M KOH indicate that the evolution of hydrogen and oxygen occurs constantly up to 120 h. The supercapacitance applications studied using cyclic voltammetry and charge–discharge studies indicate that the nanocomposite g-C3N4/C1 shows a good specific capacitance of 236 F g–1 at 0.5 A g–1 compared to others. The increased electrochemical performance of the synthesized nanocomposites is due to the incorporation of electron-withdrawing carboxylic-acid-functionalized neutral bases present in cobaloximes, which increases electron mobility. The incorporation of a cobaloxime complex into a g-C3N4 nanosheet enhances the electrocatalytic behavior of the nanosheet, and its performance can further be fine-tuned by systematic variation in the structure of cobaloxime by changing the halide ion, dioxime, the neutral base ligand, or the substituent.
Homolytic displacements at carbon in organocobaloximes: Reactions of organocobaloximes with free radical precursor with two radical centres Indian Journal of Chemistry Section A Inorganic Physical Theoretical and Analytical Chemistry, 2001
Homolytic bimolecular displacement at carbon in organocobaloximes: Intramolecular cyclizations Indian Journal of Chemistry Section A Inorganic Physical Theoretical and Analytical Chemistry, 2000
Cleavage of Co-C bond in allyl cobaloximes with arenesulphenyl chloride Indian Journal of Chemistry Section A Inorganic Physical Theoretical and Analytical Chemistry, 2000
Advanced electrochemical sensing of Pb2+ ions using V12-CoO/WO nanocomposite-modified Au electrode S Sundaresan, S Sowmya, V Madhu, V Vijaikanth Microchemical Journal 213, 113851 , 2025 2025 Citations: 1
Recent advances in electrochemical detection of common azo dyes S Sundaresan, V Vijaikanth Forensic Toxicology 43 (1), 1-21 , 2025 2025 Citations: 8
Simple and Highly Sensitive Electrochemical Sensor for Sunset Yellow Detection Based on Co 3 O 4 /g‐C 3 N 4 Nanocomposite Modified Gold Electrode S Sundaresan, S Sowmya, V Vijaikanth ChemistrySelect 9 (40), e202402342 , 2024 2024 Citations: 2
A bifunctional novel bipyridine bridged dicobaloxime complex for electrochemical proton reduction and toxic metanil yellow dye detection S Sundaresan, S Sowmya, V Vijaikanth ChemistrySelect 9 (22), e202400882 , 2024 2024 Citations: 1
Synthesis, characterization, X-ray crystal structures and antibacterial properties of cobaloximes with aniline based ligands containing acid functionality S Boopalan, A Antony, NS Loyid, V Vijaikanth, S Murugan Inorganic and Nano-Metal Chemistry 54 (2), 134-145 , 2024 2024 Citations: 2
g-C3N4/Bromocobaloxime nanocomposites as multi-functional electrocatalysts for water splitting and energy storage S Sowmya, V Vijaikanth Diamond and Related Materials 140, 110553 , 2023 2023 Citations: 3
Synthesis and electrochemical evaluation of porous carbon derived from sanitary pad waste for high performance in symmetric supercapacitor application RJ Wesley, S Sowmya, A Durairaj, R Justinabraham, V Vijaikanth, ... Journal of Energy Storage 72, 108662 , 2023 2023 Citations: 14
Eggshell Waste-Derived Carbon Composite with Calcium Bismuth Oxide for Energy Storage Application: RJ Wesley RJ Wesley, S Sowmya, A Durairaj, R Justinabraham, V Vijaikanth, ... Journal of Electronic Materials 52 (10), 6503-6513 , 2023 2023 Citations: 3
g-C 3 N 4 /Chlorocobaloxime Nanocomposites as Multifunctional Electrocatalysts for Water Splitting and Energy Storage S Sowmya, V Vijaikanth ACS omega 8 (36), 32940-32954 , 2023 2023 Citations: 23
Synthesis, crystal structure and electrocatalytic hydrogen evolution reaction studies of cobaloximes with diphenylglyoxime and carboxylic acid functionalized neutral bases S Sowmya, PM Paul, S Boopalan, A Abiram, F Michaud, V Vijaikanth Polyhedron 238, 116394 , 2023 2023 Citations: 12
Copper phosphate-assisted silkworm waste-derived biochar composite for energy storage application R Justinabraham, S Sowmya, A Durairaj, RJ Wesley, V Vijaikanth, ... Journal of Materials Science 58 (20), 8445-8462 , 2023 2023 Citations: 17
Synthesis and characterization of SbSI modified g-C3N4 composite for photocatalytic and energy storage applications R Justinabraham, S Sowmya, A Durairaj, T Sakthivel, RJ Wesley, ... Journal of Alloys and Compounds 935, 168115 , 2023 2023 Citations: 25
Electrochemistry and electrocatalytic activity of cobaloxime complexes S Sowmya, V Vijaikanth ChemistrySelect 7 (10), e202104044 , 2022 2022 Citations: 17
Copper(II)-Bis-Cyclen Intercalated Graphene Oxide as an Efficient Two-Dimensional Nanocomposite Material for Copper-Catalyzed Azide–Alkyne Cycloaddition Reaction AG Samuel, S Subramanian, V Vijendran, J Bhagavathsingh Frontiers in Chemistry 9, 754734 , 2022 2022 Citations: 16
Synthesis, Characterization and Antimicrobial Activity Studies of Chlorocobaloximes with Neutral Bases Containing Amine Functionality SSSM V. VIJAIKANTH,S. VASUKI, C. IMMANUEL DAVID, L. CHANDRAN Asian Journal of Chemistry 33 (11), 2781-88 , 2021 2021
Preparation and characterization of glassy carbon electrode modified with cobaloximes containing diphenylglyoxime S Sowmya, L Sridhar, V Vijaikanth Materials Today: Proceedings 47, 784-789 , 2021 2021 Citations: 5
Kinetics of reduction of aqueous hexaammineruthenium (III) Ion at Pt and Au microelectrodes: Electrolyte, temperature, and pressure effects V Vijaikanth, G Li, TW Swaddle Inorganic Chemistry 52 (5), 2757-2768 , 2013 2013 Citations: 18
Carboxy-functionalized dithiolate di-iron complexes related to the active site of Fe-only hydrogenase V Vijaikanth, JF Capon, F Gloaguen, FY Pétillon, P Schollhammer, ... Journal of Organometallic Chemistry 692 (19), 4177-4181 , 2007 2007 Citations: 25
2-Substituted m -Xylylene-Bridged Dicobaloximes: Structure−Property Relationship Using Variable-Temperature 1 H NMR Study V Vijaikanth, BD Gupta, D Mandal, S Shekhar Organometallics 24 (18), 4454-4460 , 2005 2005 Citations: 25
Chemically modified electrode based on an organometallic model of the [FeFe] hydrogenase active center V Vijaikanth, JF Capon, F Gloaguen, P Schollhammer, J Talarmin Electrochemistry communications 7 (4), 427-430 , 2005 2005 Citations: 75
MOST CITED SCHOLAR PUBLICATIONS
Chemically modified electrode based on an organometallic model of the [FeFe] hydrogenase active center V Vijaikanth, JF Capon, F Gloaguen, P Schollhammer, J Talarmin Electrochemistry communications 7 (4), 427-430 , 2005 2005 Citations: 75
Synthesis, Characterization, and Variable-Temperature 1H NMR Behavior of Organo-Bridged Dicobaloximes BD Gupta, V Vijaikanth, V Singh Organometallics 23 (9), 2069-2079 , 2004 2004 Citations: 42
Synthesis, characterization and cis–trans influence in cobaloximes with nioxime BD Gupta, K Qanungo, R Yamuna, A Pandey, U Tewari, V Vijaikanth, ... Journal of Organometallic Chemistry 608 (1-2), 106-114 , 2000 2000 Citations: 33
Organocobaloximes: synthesis, oxygen insertion and kinetics BD Gupta, VV Kanth, V Singh Journal of organometallic chemistry 570 (1), 1-7 , 1998 1998 Citations: 32
Synthesis and characterization of SbSI modified g-C3N4 composite for photocatalytic and energy storage applications R Justinabraham, S Sowmya, A Durairaj, T Sakthivel, RJ Wesley, ... Journal of Alloys and Compounds 935, 168115 , 2023 2023 Citations: 25
Carboxy-functionalized dithiolate di-iron complexes related to the active site of Fe-only hydrogenase V Vijaikanth, JF Capon, F Gloaguen, FY Pétillon, P Schollhammer, ... Journal of Organometallic Chemistry 692 (19), 4177-4181 , 2007 2007 Citations: 25
2-Substituted m -Xylylene-Bridged Dicobaloximes: Structure−Property Relationship Using Variable-Temperature 1 H NMR Study V Vijaikanth, BD Gupta, D Mandal, S Shekhar Organometallics 24 (18), 4454-4460 , 2005 2005 Citations: 25
g-C 3 N 4 /Chlorocobaloxime Nanocomposites as Multifunctional Electrocatalysts for Water Splitting and Energy Storage S Sowmya, V Vijaikanth ACS omega 8 (36), 32940-32954 , 2023 2023 Citations: 23
Kinetics of reduction of aqueous hexaammineruthenium (III) Ion at Pt and Au microelectrodes: Electrolyte, temperature, and pressure effects V Vijaikanth, G Li, TW Swaddle Inorganic Chemistry 52 (5), 2757-2768 , 2013 2013 Citations: 18
Copper phosphate-assisted silkworm waste-derived biochar composite for energy storage application R Justinabraham, S Sowmya, A Durairaj, RJ Wesley, V Vijaikanth, ... Journal of Materials Science 58 (20), 8445-8462 , 2023 2023 Citations: 17
Electrochemistry and electrocatalytic activity of cobaloxime complexes S Sowmya, V Vijaikanth ChemistrySelect 7 (10), e202104044 , 2022 2022 Citations: 17
Copper(II)-Bis-Cyclen Intercalated Graphene Oxide as an Efficient Two-Dimensional Nanocomposite Material for Copper-Catalyzed Azide–Alkyne Cycloaddition Reaction AG Samuel, S Subramanian, V Vijendran, J Bhagavathsingh Frontiers in Chemistry 9, 754734 , 2022 2022 Citations: 16
Synthesis and electrochemical evaluation of porous carbon derived from sanitary pad waste for high performance in symmetric supercapacitor application RJ Wesley, S Sowmya, A Durairaj, R Justinabraham, V Vijaikanth, ... Journal of Energy Storage 72, 108662 , 2023 2023 Citations: 14
Organocobaloximes with mixed-dioxime equatorial ligands: a one-pot synthesis BD Gupta, V Singh, K Qanungo, V Vijaikanth, R Yamuna, T Barclay, ... Journal of Organometallic Chemistry 602 (1-2), 1-4 , 2000 2000 Citations: 13
Synthesis, crystal structure and electrocatalytic hydrogen evolution reaction studies of cobaloximes with diphenylglyoxime and carboxylic acid functionalized neutral bases S Sowmya, PM Paul, S Boopalan, A Abiram, F Michaud, V Vijaikanth Polyhedron 238, 116394 , 2023 2023 Citations: 12
Recent advances in electrochemical detection of common azo dyes S Sundaresan, V Vijaikanth Forensic Toxicology 43 (1), 1-21 , 2025 2025 Citations: 8
Preparation and characterization of glassy carbon electrode modified with cobaloximes containing diphenylglyoxime S Sowmya, L Sridhar, V Vijaikanth Materials Today: Proceedings 47, 784-789 , 2021 2021 Citations: 5
g-C3N4/Bromocobaloxime nanocomposites as multi-functional electrocatalysts for water splitting and energy storage S Sowmya, V Vijaikanth Diamond and Related Materials 140, 110553 , 2023 2023 Citations: 3
Eggshell Waste-Derived Carbon Composite with Calcium Bismuth Oxide for Energy Storage Application: RJ Wesley RJ Wesley, S Sowmya, A Durairaj, R Justinabraham, V Vijaikanth, ... Journal of Electronic Materials 52 (10), 6503-6513 , 2023 2023 Citations: 3
Simple and Highly Sensitive Electrochemical Sensor for Sunset Yellow Detection Based on Co 3 O 4 /g‐C 3 N 4 Nanocomposite Modified Gold Electrode S Sundaresan, S Sowmya, V Vijaikanth ChemistrySelect 9 (40), e202402342 , 2024 2024 Citations: 2