Yong Rok Lee's research while affiliated with Yeungnam University and other places
What is this page?
This page lists the scientific contributions of an author, who either does not have a ResearchGate profile, or has not yet added these contributions to their profile.
It was automatically created by ResearchGate to create a record of this author's body of work. We create such pages to advance our goal of creating and maintaining the most comprehensive scientific repository possible. In doing so, we process publicly available (personal) data relating to the author as a member of the scientific community.
If you're a ResearchGate member, you can follow this page to keep up with this author's work.
If you are this author, and you don't want us to display this page anymore, please let us know.
It was automatically created by ResearchGate to create a record of this author's body of work. We create such pages to advance our goal of creating and maintaining the most comprehensive scientific repository possible. In doing so, we process publicly available (personal) data relating to the author as a member of the scientific community.
If you're a ResearchGate member, you can follow this page to keep up with this author's work.
If you are this author, and you don't want us to display this page anymore, please let us know.
Publications (394)
Chebulic Myrobalan is the main ingredient in the Ayurvedic formulation Triphala, which is used for kidney and liver dysfunctions. Herein, natural nitrogen-doped carbon dots (NN-CDs) were prepared from the hydrothermal carbonization of Chebulic Myrobalan and were demonstrated to sense heavy metal ions in an aqueous medium. Briefly, the NN-CDs were d...
Nanofibers (NFs) can be encapsulated with cyclodextrins (CDs) based host-guest complexes (HCs) in order to enable many biological applications. Here, benzocaine (BNZ) forms HCs with β-cyclodextrin (β-CD) that are co-precipitated and further added to polyacrylonitrile (PAN) solution for making BNZ:β-CD-HCs/PAN NFs material with the aid of electrospi...
Herein, a simple, cost-effective, and in-situ environmentally friendly approach was adopted to synthesize carbon dot-adorned silver nanoparticles (CDs@AgNPs) from yellow myrobalan (Terminalia chebula) fruit using a hydrothermal treatment without any additional reducing and or stabilizing agents. The as-synthesized CDs@AgNP composite was systematica...
Cytotoxic plant extracts have been considered as the potential alternative materials to the toxic chemotherapeutic agents used in cancer treatment and cancer therapy. The cytotoxicity of the Cardiospermum halicacabum leaf (CHL) extract was investigated on the HepG2 cell lines. Electrospun PVdF nanofibers (NFs) soaked with CHL extract and also inclu...
In recent years, fuel cell (FC) technology has seen a promising increase in its proportion in stationary power production. Several pilot projects are in operation across the world, with the number of running hours steadily rising, either as stand-alone units or as part of integrated gas turbine-electric energy plants. FCs are a potential energy sou...
In this study, n‐type SnO2 was synthesized and modified with p‐type NiWO4 to create a new NiWO4/SnO2 p–n heterojunction photocatalyst for effective organic dye degradation (Amaranth). X‐ray powder diffraction (XRD), scanning electron microscopy (SEM), transmission electron microscopy (TEM), UV–Vis diffuse reflection spectroscopy (DRS), and Brunauer...
Nanofibers are most commonly manufactured by electrospinning since it is low-cost, repeatable, simple, and produces continuous nanofibers. The electrospun nanofibers have unique characteristics such as small diameters, high porosity, and a high specific surface area. Nanofibers, which are similar to extracellular matrix (ECM), can be used in biomed...
Isolated endophyte fungi from Mappia foetida have been explored as a potential source for the mass production of anticancer drug lead compounds in the current study. Since medical plants are not feasible economically for mass production of bioactive pharmaceutical important molecules using plant tissue culture due to factors like media design and f...
Vateria indica is persistent tree used in Unani sources for the medication and classified as critically endangered. Thus, endophytes for alternative methods to explore these endangered Plants having rich source pharmaceuticals’ active molecules for drug development and production. Endophytes comprises unexplored microbes as a potential source of ri...
Over the years, extensive urbanization and industrialization have led to xenobiotics contamination of the environment and also posed a severe threat to human health. Although there are multiple physical and chemical techniques for xenobiotic pollutants management, bioremediation seems to be a promising technology from the environmental perspective....
With the thought and strong hope of uniqueness and challenging characteristic highlights and importance of nanofibrous mats (NFMs) along with cyclodextrins (CDs) that having a significant opportunity, chances and handling a vital role in hostile to bacterial activities. For the most part, CDs are utilized to upgrade the antibacterial activity throu...
In the present work, Lidocaine: β-Cyclodextrin (LDC:β-CD) complex is formed and confirmed through analytical methods. The absorption and fluorescence maxima of the complex is shifted toward the blue region with the increasing concentration of β-CD. The FT-IR study predicts the entrapment of the aromatic part into the cavity of the host, as the stre...
Carbon dioxide (CO2) has emerged as one of the exciting cost-effective, abundant, and ready-to-use C1 sources in synthetic organic chemistry. The thermodynamic stability & kinetic inertness of CO2 limit its direct fixation were limited only in the presence of air-sensitive organometallic reagents, which creates a hurdle for its practical utilizatio...
Synthesis of α-aryl acetophenones from styryl ethers and aryldiazonium salts is described at room temperature. The reaction is catalyzed by palladium acetate in the absence of ligands and base.
A facile and efficient strategy for obtaining functionalized and multihydroxylated xanthones via Rh catalysis under redox-neutral conditions is developed. Diverse salicylaldehydes bearing heterocycles, aromatics, and fused aromatics can be rapidly coupled with 1,4-benzoquinones or 1,4-hydroquinones to afford valuable xanthones via cascade C-H/O-H f...
A Pd(II)-catalyzed C(sp3)−H/C(sp2)−H coupling/annulation of anilides and α-dicarbonyl compounds for the synthesis of diverse N-acyl indoles is described. The reaction is
achieved by cascade C−H activation, coupling, and intramolecular
cyclization. This protocol provides a variety of indoles with high
functional group tolerance and excellent regiose...
The cation exchange process is an effective method for improving the electrochemical performance of electrodes in supercapacitors. In this study, the cation (Cu) and co-cation (Cu–Fe) exchanges were achieved in the form of a cobalt oxide crystallite using a chemical bath deposition method, followed by high-temperature calcination. Interestingly, th...
A straight forward synthetic strategy is developed in this study to synthesize highly fluorescent red phosphorus on nitrogen-doped reduced graphene oxide (f-RP@N-rGO) nanosheets in an aqueous medium which used as...
Halofunctionalization of various unactivated arylalkynes to the corresponding 1H‐indenes in the presence of a particular class of carboxaldehydes and boron trihalides (BX3, X = F, Cl, Br, I) is described. A diverse array of halofunctionalized indenes substituted with a heterocycle has been synthesized regioselectively with BX3 as a promotor for the...
Rh(III)‐catalyzed cascade oxidative annulation of 2‐arylquinazolinones with various maleimides to afford spiroisoindoloquinazolinones bearing pyrrolidinediones is described. Sequential ortho C−H functionalization and spirocyclization via aza‐Michael addition result in the formation of both C−C and C−N bonds in a single operation. This atom‐ and ste...
A series of new functionalized 3-indolylindolin-2-ones, 3-(1-methylpyrrol-2-yl)indolin-2-ones, and 3-(thiophen-2-yl)indolin-2-ones were synthesized by using novel indium (III)-catalysed reaction of various 3-diazoindolin-2-ones with indoles, 1-methylpyrrole, or thiophene via one-pot procedure. The newly synthesized compounds were characterized and...
In the present study, a novel N-doped carbon nanograss (N –CNG) were synthesized from the used baby- diaper absorbent via carbonization under the argon atmosphere and has been applied as an electroactive material for flexible supercapacitor. The synthesized N –CNG display a grass-like morphology with an ac- ceptable degree of graphitization. The su...
A novel and facile regioselective synthetic method for polyfunctionalized furans involving rhodium(III)-catalyzed pyrazole-or indazole-directed dual C-H functionalization with diazodicarbonyls have been developed. This strategy provides rapid access to diverse tetrasubstituted furans bearing various pyrazoles or indazoles. This unprecedented one-po...
A support‐free heterogeneous Pd3Co nanostructured composite (NC), synthesized via hydrothermal route, acted as an effective catalytic system in multivariate Heck, Sonogashira and Suzuki‐type coupling reactions of iodonium ylides. The XPS analysis of the bimetallic Pd3Co NCs confirmed the elemental composition as 75% palladium and 25% cobalt. Furthe...
A protocol was developed for the synthesis of 3‐thioindoles in good‐to‐excellent yields involving sulfenylation between 2‐nitrocinnamaldehydes and various thiols using a well‐defined copper(I)‐phosphine complex catalyst. This unconventional divergent approach involves in situ generation of indoles via domino C‐S/C‐N bond formation initiated by sulf...
A facile and efficient Rh(iii)-catalyzed annulation of arylamides with 3-diazoquinolinediones for the construction of diverse and highly functionalized isochromenoquinolinediones is described. Furthermore, the methodology is applicable for delivering various relevant molecules such as pyridopyranoquinolindiones, thienopyranoquinolinones, and indolo...
Metal oxide/graphene photocatalysts have been attracting considerable attention in solving environmental pollution problems because of the limitations of the semiconductor-based photocatalysts. In this study, highly efficient and inexpensive zinc oxide (ZnO)nanoparticles with three different morphologies, such as nanospheres, nanodisks, and nanorod...
Fe3O4-multiwalled carbon nanotube (MWCNT) nanoparticles were prepared by using Astragalus membranaceus root extract and characterised by all parameters. The synthesised Fe3O4−MWCNTs were used as a heterogeneous catalyst for the synthesis of diverse polyfunctionalised pyridines. Pyridines are important heterocyclic compounds in many natural products...
This work reports the recovery of manganese ions from spent primary alkaline battery (PAB) cathode, subsequent anodic electro-synthesis of MnO2 nanoparticles on Ni foam (MnO2 NPs/Ni foam) for supercapacitors. The as-fabricated MnO2 NPs/Ni foam is characterized by common optical and surface analytical techniques. The X-ray diffraction (XRD) of MnO2...
Ruthenium(II)-catalyzed reactions of cyclic diazodicarbonyl compounds with β-ketoamides for chemo- and stereoselective construction of cyclohexanone-fused γ-butenolides is described. This study represents the first example for the addition of enol substrate which is formed by the tautomerization of the β-ketoamides to the electrophilic carbene cent...
We report the synthesis of eco-friendly fluorescent nitrogen-doped carbon dots (NCDs) using the renewable resource of Phyllanthus emblica juice as a precursor by the hydrothermal process at 200 °C for 12 h. The synthesized NCDs emitted bright fluorescence without any pretreatment of the sample under the excitation of UV light and exhibited excitati...
Band-gap values can be affected by factors such as size, doping materials, and oxygen vacancies. The decrease in band gap and change in state of ZrO2 with the addition of ZnO indicates interfacial interactions between ZrO2 and ZnO in the nanocomposites (NCs), which is further confirmed by the observed shift of the peaks in Raman spectra. The hetero...
The direct C-3 arylation of quinoxalin-2-ones with arenes are achieved by a Pd(TFA)2-catalyzed cross-dehydrogenative coupling (CDC) reaction. A wide array of functionalities, including highly sensitive allyl- and benzyl group substituted quinoxalin-2(H)-ones, are readily assembled with arenes containing electron-donating and electron-withdrawing gr...
In this work, nitrogen-doped carbon quantum dots (N-CQDs) have been synthesized successfully by a simple hydrothermal method and demonstrated its application for multicolor imaging in Caenorhabditis elegans (C. elegans) as an in vivo model. The synthesized N-CQDs were characterized by various physicochemical techniques such as XRD, Raman spectrosco...
Sulphur and nitrogen-rich carbon layers (S/N-CLs) have been derived successfully via a simple calcination for high energy applications including supercapacitor and electrocatalytic hydrogen evolution reaction (HER). The flexible working electrode was fabricated using thoroughly analyzed S/N-CLs composite as an active electrode energy material for s...
In this work, sulfur doped nickel cobalt layered double hydroxide nanosheet arrays are fabricated on a stainless steel (S-LDH/SS) substrate by simple electrodeposition technique for electrocatalytic hydrogen evolution reaction (HER) and supercapacitor applications. The surface morphology and chemical composition of S-LDH/SS are accessed by field em...
A simple and efficient base-promoted denitrogenative/deoxygenative/deformylative benzannulation is developed for the construction of biologically interesting polyfunctionalized xanthones starting from N-tosylhydrazones and two molecules of 3-formylchromones. This unprecedented protocol proceeds via a cascade diazo formation/Michael addition/denitro...
An efficient and novel construction of diverse and polyfunctionalized γ-pyrones has been developed by InBr3-catalyzed annulation of various cyclic and acyclic diazo compounds with multifarious active methylenes, 4-hydroxycoumarins, or 4-hydroxyquinolinone. This technique proceeds through a cascade carbene generation/ketene formation/conjugate addit...
In this work, an ultra-sensing photoelectrochemical (PEC) glucose biosensor has been constructed from the bio-derived nitrogen-doped carbon sheets (NDC) wrapped titanium dioxide nanoparticles (NDC-TiO2 NPs) followed by the covalent immobilization of glucose oxidase (GODx) on them (designated as a GODx/NDC-TiO2NPs/ITO biosensor). Initially, the TiO2...
A facile and efficient protocol for the construction of 3‐carbonyl functionalized 4‐pyrones has been developed using a transition‐metal free thermal cascade reaction of diazodicarbonyls with β‐enamino esters or β‐enamino ketones. This reaction proceeds via cascade carbene generation, ketene formation via thermal Wolff‐rearrangement, nucleophilic ad...
A novel Cu(OTf)2-catalyzed [3+2+1] annulation of chromenone carbaldehydes or benzochromenone carbaldehydes with β-enamino substrates and ammonium acetate is developed. This protocol provides a facile and efficient one-pot procedure for the construction of diverse and functionalized pyridines bearing a variety of substituents. This [3+2+1] annulatio...
A novel and facile regioselective synthesis of furan-3-carboxamides by a silver(I)/base-promoted reaction of propargyl alcohol with 3-oxo amides has been demonstrated. This one-pot protocol provides a rapid synthetic approach to diverse trisubstituted furan-3-carboxamides via cascade nucleophilic addition, intramolecular cyclization, elimination, a...
An efficient synthesis of highly π-extended carbazoles is described via an unexpected domino [5 + 3 + 1] annulation approach. The Cu(I)-/base-promoted reactions of 2-nitrocinnamaldehydes with benzyl cyanides provide diverse benzo[b]carbazoles. The reaction is proposed to proceed via a sequential Michael addition/intramolecular addition of an enol i...
The iron-oxide nanoparticles (IONPs) filled multi-walled carbon nanotubes (IONP-MWCNTs hybrid) were directly synthesized via chemical vapour deposition method with acetylene as a carbon source. The bare IONPs were synthesized by hydrothermal method and the prepared bare IONPs were employed as a catalytic-support as well as a filling agent for the s...
A honeycomb-like NiMoO4 nanoporous network electrode was synthesized on nickel foam using an electrodeposition method and used for the fabrication of asymmetric supercapacitors (ASCs). The growth process of the NiMoO4 nanostructure was controlled by varying the number of electrochemical cycles. The evolution of the NiMoO4 nanoflakes with the electr...
Indium(III)/silver(I)-catalyzed [2 + 2 + 1] annulation of arylhydrazine hydrochlorides with β-enamino esters via multicomponent reactions for the construction of diverse and multisubstituted N-arylpyrazoles has been demonstrated. The oxidative cycloaddition proceeds via a cascade triple Michael addition/elimination/air oxidation. This novel protoco...
Hexagon-shaped composite made up of iron oxide [email protected] ([email protected]) was successfully synthesized at 185 °C by a simple hydrothermal method. All the analytical results confirmed the formation of [email protected] with a uniform size without apparent aggregation. The [email protected] composite exhibits excellent catalytic activity t...
In this work, highly ordered nickel oxide nanoparticles were electrochemically synthesized on nickel foam (NiOx NPs/Ni foam) via the formation and subsequent heat treatment of nickel hydroxide. The synthesized NiOx NPs were characterized using Fourier transform infrared (FT-IR) spectroscopy, X-ray diffraction (XRD), field emission scanning electron...
The front cover picture, provided by Yong Rok Lee et al., exhibits the advances in the halo‐functionalization of diazo compounds. Recently, diazo compounds have become extensively used for the synthesis of organo halides. This review provides a comprehensive summary of such transformations on diazo compounds using diverse halogenating agents. Detai...
As an efficient photocatalytic titanium dioxide [email protected] carbon (TiO2[email protected]) nanocomposite and bright fluorescent with good biocompatible nitrogen-doped carbon dots (N-CDs) were synthesized at once by an affordable hydrothermal method. Physicochemical properties of the synthesized materials were examined by X-ray diffraction (XR...
Present study investigated decoration of Cu(OH)2 with different morphologies by copper precursors, on 3D nickel foam. The Cu(OH)2-A (nano flower)electrode showed an excellent capacitance of 1332 F g⁻¹ at current density of 2 A g⁻¹ compared to the Cu(OH)2-C (nano ribbon, 1100 F g⁻¹) and Cu(OH)2-S (nano long leaf, 1013 F g⁻¹) electrodes. Asymmetric s...
The corrosion inhibition and adsorption behavior of spermidine on mild steel (MS) in 1 M sulfuric and 0.50 M hydrochloric acid have been investigated at room temperature by electrochemical methods viz., electrochemical impedance spectroscopy (EIS) and Tafel polarization techniques. The adsorption of spermidine on MS is studied by Langmuir adsorptio...
The present work illustrates the potential uses of nitrogen-doped multi-fluorescent carbon dots (N-CDs) for Fe3+ sensing, cellular multi-colour imaging, and fluorescent ink. N-CDs were synthesized using Magnolia liliiflora flower by the simple hydrothermal method. The resulted N-CDs was found to be nearly spherical in shape with the size of about 4...
In this study, N-doped mesoporous carbon ropes (N-MCRs), derived from polybenzoxazine, a new high-performance thermosetting resin, used as an electrode active material for supercapacitor application. Nitrogen-containing tetraethylenepentamine and eugenol were used to synthesize polybenzoxazine. The structure of the monomer was supported by Fourier...
Benzene and its derivatives are the most abundant substructures of several interesting compounds such as bioactive molecules. Due to their importance, the development of methods for their construction has attracted considerable attention. The regioselective synthesis of polysubstituted aromatics and heteroaromatics via aromatic substitutions is cha...
An unprecedented methodology for the preparation of diverse S-alkyl 2-aminoarylthioates has been developed based on cesium carbonate-promoted direct ring opening of 3-chlorooxindoles with thiols. This novel protocol proceeds via cascade sulfenylation, aerial oxidation, C2–C3 bond cleavage, and decarboxylation. The resulting products from this trans...
Organohalides and their derivatives have received much attention in both the design and development of new synthetic reagents, drugs, and functional materials. In this review, we provide a comprehensive summary of recent advances and strategies in the halo‐functionalization of diazo compounds, including halogenation, dihalogenation, dihaloolefinati...
In this work, carbon encapsulated RuO2 nanorods (RuO2 NRs/C) has been synthesized by thermolysis of ruthenium chloride and Punica granatum (P. granatum) peel under N2 atmosphere. The synthesized RuO2 NRs/C was characterized using Fourier transform infrared (FT-IR) spectroscopy, X-ray diffraction method (XRD), field emission scanning electron micros...
Citrus is one of the largest and most popular fruit crops commercially grown across the globe. It is not only important in terms of economy but is also popular for its nutritional benefits to human and farm animals. Citrus is available in several varieties, all with attractive colors. It is consumed either fresh or in processed form. After processi...
Diverse and functionalized 3-indolyl benzo[ b ][1,4]oxazin-2-ones were synthesized via copper-catalyzed direct coupling of benzo[ b ][1,4]oxazin-2-one and indoles in air.
A simple and efficient BF3∙OEt2 mediated methodology for the construction of diverse 2-phenylpyridines bearing benzophenone moieties from readily available 3-formylchromones and phenylacetylenes in wet acetonitrile was developed. The nitrogen source for the pyridine construction was derived from acetonitrile. This one-pot protocol proceeds via [3+2...
Cobalt oxide [email protected] reduced graphene oxide (Co3O4@N-rGO) composite and nitrogen-doped graphene dots (N-GDs) were synthesized by a one-pot simple hydrothermal method. The average sizes of the synthesized bare cobalt oxide nanoparticles (Co3O4 NPs) and Co3O4 NPs in the Co3O4@N-rGO composite were around 22 and 24nm, respectively with an int...
A facile and efficient protocol for the construction of functionalized biarylols by Fe(OTf)3-catalyzed direct arylation of 1-diazonaphthalen-2(1H)-ones with arenes has been developed. This methodology provides diverse 1-arylnaphthalen-2-ols in moderate to good yields. This approach has also been applied to the synthesis of biologically interesting...
We engineered novel heterojunction ceria (CeO2) QDs decorated on the surfaces of graphitic carbon nitride (g-C3N4) nanosheets by a facile in situ hydrothermal synthetic route. Using core-level/valence-band X-ray photoelectron spectroscopy (XPS), diffuse reflectance spectroscopy, and work function measurements of the materials, we constructed the en...
A facile synthesis of diversely functionalized N -heteroaryl-2-pyridones is achieved by Cu(OTf) 2 -catalyzed [3+2+1] annulation of various 2-aminopyridines via cascade reaction.
This paper describes a facile and green strategy for the synthesis of yttrium oxide nanoparticles (Y2O3 NPs) by a straightforward process using Liriope platyphylla rhizome extract as the reducing agent and yttrium nitrate hexahydrate as the sole precursor without other additives. The crystallinity, surface chemistry, morphology, elemental compositi...
The hybrid composite of ZnO nanoparticles decorated nitrogen-doped graphitic carbon sheets (ZnO@N-C) alongside nitrogen-doped carbon dots (N-CDs) were synthesized by the direct hydrothermal method of peach fruit juice and ZnO nanoparticles (ZnO NPs). The synthesized ZnO@N-C hybrid composite and N-CDs were thoroughly characterized by various physico...
Supercapacitors are attracting attention as an energy storage device but the energy density and cycle life of the electrode materials require further improvement for commercial applications. To achieve this goal, a corn flake-like NiO nanostructure on nickel foam was synthesized using a facile electrodeposition method. X-ray diffraction, high resol...
A facile, economical and one-step hydrothermal method is used to synthesize highly durable fluorescent nitrogen-doped carbon dots (FNCDs) by utilizing Phyllanthus acidus (P. acidus) and aqueous ammonia as the carbon and nitrogen sources, respectively. The synthesized FNCDs have an average size of 4.5±1 nm and showed bright blue fluorescence under t...
Alloy nanostructures had received much attention for their applications in energy, catalysis, and optics. This paper described a facile ultrasonic approach for the synthesis of Ni–B alloy nanorods (Ni–B NRs). The crystallinity, chemical state, surface area and surface morphology of Ni–B NRs were characterized using X-ray diffraction (XRD), X-ray ph...
Quantitative investigation and systematic studies of quercetin, total phenolics, flavonoids, antioxidants, antibacterial and antibiofilm or antibiofouling properties of methanolic extracts of onions obtained from six different varieties have been carried out to explore their relative merits in terms of biological activities of fresh and aging onion...
A novel magnetically recoverable hematite nanoparticles (α-Fe2O3 NPs) was fabricated by a simple, one pot, and green method using the rhizome of Cyperus rotundus L., as a reducing and stabilizing agent. The prepared nanoparticles were well characterized by all parameters. TEM showed that the hematite nanoparticles had a rhombohedral shape and range...
Correction for ‘Modified chemical synthesis of MnS nanoclusters on nickel foam for high performance all-solid-state asymmetric supercapacitors’ by Vijay S. Kumbhar et al., RSC Adv., 2017, 7, 16348–16359.
This study presents a simple approach to fabricate superhydrophobic composite coating on aluminum surface from the hybrid assembly of inorganic–organic layers via electroless copper deposition (as roughness inducer) followed by surface modification with laurylamine (as a low surface energy material). We demonstrate the effect of immersion time on t...
Heteroatom doped carbon structures received a great attention owing to its applications in catalysis, energy and optics. In this work, a simple hydrothermal approach for the synthesis of nitrogen doped graphitic carbon sheets (N-GCSs) is reported. Rubus parvifolius (R. parvifolius) fruit juice and aqueous ammonia are used as carbon precursor and ni...
