Browsing by Author "Komalavalli, Lakshminarayanan"

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FACILE APPROACH FOR GREEN SYNTHESIS OF FLUORESCENT CARBON DOTS FROM MANIHOT ESCULENTA AND THEIR POTENTIAL APPLICATIONS AS SENSOR AND BIO-IMAGING AGENTS
(Elsevier, 2022-03) Monisha, Sivanandhan; Amutha, Parasuraman; Chinnasamy, Surya; Komalavalli, Lakshminarayanan; Balu, Krishnakumar; Durai, Mani; Young-Ho, Ahn
An eco-friendly approach for the synthesis of blue fluorescent carbon dots (CDs) using Manihot esculenta with an average size of 3–5 nm through hydrothermal method has been reported. Functionality of the prepared CDs was characterized by FT-IR spectroscopy. Structural and morphological characterisation were carried with XRD and TEM techniques, these studies exposed amorphous nature of carbons dots with spherical shape. Optical properties of CDs were examined using UV–Visible and Photoluminescence spectral techniques. Owing to strong blue fluorescence, CDs were evaluated for its ability to sense various heavy metal ions. Attributable to significant response towards Fe3+ ions among different metal ions tested (Al3+, Cu+, Co2+, Pb2+, Zn2+, Fe3+, Ca2+, Hg2+ and Mg2+), CDs were used as a selective fluorescence probe for detection of Fe3+. The bioimaging and cytotoxicity aspects of CDs on MDA MB-231 breast cancer cell lines were confirmed by localised experiments. The synthesised CDs were found to be non-toxic even at their high concentration of 500 µg/mL.
FACILE APPROACH FOR GREEN SYNTHESIS OF FLUORESCENT CARBON DOTS FROM MANIHOT ESCULENTA AND THEIR POTENTIAL APPLICATIONS AS SENSOR AND BIO-IMAGING AGENTS
(Elsevier, 2022-03) Monisha, Sivanandhan; Amutha, Parasuraman; Chinnasamy, Surya; Komalavalli, Lakshminarayanan; Balu, Krishnakumar; Durai, Mani; Young-Ho, Ahn
An eco-friendly approach for the synthesis of blue fluorescent carbon dots (CDs) using Manihot esculenta with an average size of 3–5 nm through hydrothermal method has been reported. Functionality of the prepared CDs was characterized by FT-IR spectroscopy. Structural and morphological characterisation were carried with XRD and TEM techniques, these studies exposed amorphous nature of carbons dots with spherical shape. Optical properties of CDs were examined using UV–Visible and Photoluminescence spectral techniques. Owing to strong blue fluorescence, CDs were evaluated for its ability to sense various heavy metal ions. Attributable to significant response towards Fe3+ ions among different metal ions tested (Al3+, Cu+, Co2+, Pb2+, Zn2+, Fe3+, Ca2+, Hg2+ and Mg2+), CDs were used as a selective fluorescence probe for detection of Fe3+. The bioimaging and cytotoxicity aspects of CDs on MDA MB-231 breast cancer cell lines were confirmed by localised experiments. The synthesised CDs were found to be non-toxic even at their high concentration of 500 µg/mL.
NBCL5 FUNCTIONALIZED PERLITE: A POTENT AND RECYCLABLE CATALYST FOR SYNTHESIS OF PYRANS
(MDPI, 2023-02-16) Komalavalli, Lakshminarayanan; Monisha, Sivanandhan; Subramaniyan, Ramasundaram; Tae Hwan, Oh; Kinjal J, Shah; Kumaravel, Saranraj; Amutha, Parasuraman; Krishnakumar, Balu
Niobium pentachloride functionalised perlite was prepared via a solid state dispersion technique, which was utilized as an efficient heterogeneous catalyst for the synthesis of pyrans. The immobilisation of NbCl5 over perlite was examined by Fourier-transform infrared (FT-IR) spectroscopy, X-ray diffraction (XRD), Thermogravimetric analysis (TGA), scanning electron microscope (SEM) with energy dispersive spectra (EDS), and Brunauer, Emmett and Teller (BET) surface area measurements. The wt% of NbCl5-loaded perlite was optimized based on the adequacy with respect to the yield of the pyrans in various solvents. The recyclability of the catalyst was validated in synthesizing pyrans and the results marked its efficiency up to five runs. The efficacy of the NbCl5/perlite catalyst was found to be comparable and better with respect to the other heterogeneous catalysts reported. The structures of pyrans were confirmed by FT-IR, 1H and 13C NMR spectral techniques. The proposed recyclable heterogeneous NbCl5/perlite catalyst simplifies the protocol, and has minimal chemical waste, a lower reaction time and a high-yield.
NBCL5 FUNCTIONALIZED PERLITE: A POTENT AND RECYCLABLE CATALYST FOR SYNTHESIS OF PYRANS
(Sustainability (Switzerland), 2023-02-16) Komalavalli, Lakshminarayanan; Monisha, Sivanandhan; Subramaniyan, Ramasundaram; Tae, Hwan Oh; J, Kinjal Shah; Kumaravel, Saranraj; Amutha, Parasuraman; Krishnakumar, Balu
Niobium pentachloride functionalised perlite was prepared via a solid state dispersion technique, which was utilized as an efficient heterogeneous catalyst for the synthesis of pyrans. The immobilisation of NbCl5 over perlite was examined by Fourier-transform infrared (FT-IR) spectroscopy, X-ray diffraction (XRD), Thermogravimetric analysis (TGA), scanning electron microscope (SEM) with energy dispersive spectra (EDS), and Brunauer, Emmett and Teller (BET) surface area measurements. The wt% of NbCl5-loaded perlite was optimized based on the adequacy with respect to the yield of the pyrans in various solvents. The recyclability of the catalyst was validated in synthesizing pyrans and the results marked its efficiency up to five runs. The efficacy of the NbCl5/perlite catalyst was found to be comparable and better with respect to the other heterogeneous catalysts reported. The structures of pyrans were confirmed by FT-IR, 1H and 13C NMR spectral techniques. The proposed recyclable heterogeneous NbCl5/perlite catalyst simplifies the protocol, and has minimal chemical waste, a lower reaction time and a high-yield.
PERLITE IMPREGNATED WITH HPA/Α-FE2O3: MAGNETICALLY SEPARABLE CATALYST FOR THE SYNTHESIS OF 3,3,6,6-TETRAMETHYL-9-SUBSTITUTED-3,4,6,7-TETRAHYDRO-2H-XANTHENE-1,8-(5H,9H)-DIONES
(Elsevier, 2021-10) Komalavalli, Lakshminarayanan; Amutha, Parasuraman; Manawwer, Alam; Naushad, Ahmad; Balu, Krishnakumar; Annamalai, Raja; Misook, Kang
Phosphotungstic acid (HPA)/α-Fe2O3-loaded Perlite has been prepared as a recyclable heterogeneous catalyst for the synthesis of xanthenes. The prepared catalyst has been characterized by Fourier-transform infrared (FTIR) spectroscopy, X-ray diffraction (XRD) analysis, scanning electron microscopy (SEM) with energy-dispersive X-ray (EDX) spectroscopy, transmission electron microscopy (TEM) with selected-area electron diffraction (SAED) pattern analysis, thermogravimetric analysis (TGA), and Brunauer–Emmett–Teller (BET) measurements. XRD peaks at 2θ = 9.08° and 26.73° (HPA) and 36.03°, 39.72°, and 62.6° (α-Fe2O3) showed efficient loading of HPA/α-Fe2O3 on the Perlite surface. TEM images of the prepared HPA/α-Fe2O3/Perlite corroborated the successful loading of α-Fe2O3 on the Perlite. Advantages of this new protocol include facile handling, low cost, easy work-up procedure, and remarkable reusability over several cycles without loss of the catalytic activity.