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32 results on '"Jothi, Dhanapal"'

20. Rational Design of Diphenyl-Λ5σ4-Phosphinine Based Fluorescent Probe for the Selective Detection of Hg2+ Ions: Real Application in Cell Imaging and Paper Strips

Author

Kulathu Iyer, Sathiyanarayanan, primary, Enbanathan, Saravanan, additional, Manickam, Saravanakumar, additional, Dhanthala Thiyagarajan, Manojkumar, additional, Jothi, Dhanapal, additional, Manoj Kumar, Selin, additional, Munusamy, Sathiskumar, additional, Murugan, Dhanashree, additional, Rangasamy, Loganathan, additional, and Balijapalli, Umamahesh, additional

Published
2022
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31. A Highly Selective and Sensitive Colorimetric Chemosensor for the Detection of Hydrogen Sulfide: A Real‐time Application in Multiple platforms.

Author

Jothi, Dhanapal, Munusamy, Sathishkumar, and Kulathu Iyer, Sathiyanarayanan

Subjects
*HYDROGEN sulfide, *DETECTION limit, *PHENANTHRIDINE, *HIGH performance liquid chromatography
Abstract

Calorimetric chemosensors are found to be advantageous sensing systems due to their simplicity and favorable responsive properties. Although some colorimetric probes have been reported to detect hydrogen sulfide (H2S), the creation of rapid, highly selective and sensitive probes for the detection of H2S remains a challenging target. In this work, we established dinitrosulphonamide decorated phenanthridine and 2,4‐dinitro‐N‐(4‐(7,8,13,14‐tetrahydrodibenzo[a, i]phenanthridin‐5‐yl)phenyl)benzenesulfonamide (PHSH), for the calorimetric detection of H2S. H2S‐triggered thiolysis of PHSH resulted in a marked absorption enhancement alongside a visual color change from colorless to dark yellow. The result indicated that the chemosensor showed high sensitivity and selectivity with a fast response of less than 10 s with a detection limit as low as 6.5 nM. The chemosensor reaction mechanism with H2S was studied by UV‐vis, 1H NMR, mass and HPLC analysis. In addition, the chemosensor has been used for the determination of H2S in many real‐time samples. [ABSTRACT FROM AUTHOR]

Published
2022
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32. A colorimetric and ratiometric fluorescent sensor for biogenic primary amines based on dicyanovinyl substituted phenanthridine conjugated probe

Author

Jothi Dhanapal, S. K. Ashok Kumar, Balijapalli Umamahesh, M.P. Saravanakumar, Kulathu Iyer Sathiyanarayanan, and Ramasamy Selvakumar

Subjects
Phenanthridine, Process Chemistry and Technology, General Chemical Engineering, Solvatochromism, 02 engineering and technology, Conjugated system, 010402 general chemistry, 021001 nanoscience & nanotechnology, Photochemistry, 01 natural sciences, Fluorescence, 0104 chemical sciences, chemistry.chemical_compound, chemistry, Moiety, Amine gas treating, Methylene, 0210 nano-technology, Acetonitrile
Abstract

Two molecules with an aldehyde donor substituted 4'-(7,8,13,14-tetrahydrodibenzo[a,i]phenanthridin-5-yl)-[1,1′-biphenyl]-4-carbaldehyde (5) and a dicyanovinyl acceptor substituted 2-((4'-(7,8,13,14-tetrahydrodibenzo[a,i]phenanthridin-5-yl)-[1,1′-biphenyl]-4-yl)methylene)malanonitrile (7) were synthesized, and both were applied to remarkable solvatochromism studies. Due to their intramolecular charge transfer (ICT) characteristic, both fluorophores, with a positive solvatochromism effect and emission color, changed from blue to green-orange when the polarity was increased from non-polar hexane to polar acetonitrile solvent. Meanwhile, for compound 5 and 7, aggregation induced emission (AIE) and acidochromism studies have been carried out. The obtained results indicated that compound 5 and 7 exhibited tunable aggregation induced emission and quenching of acidochromism for 7. In this study, we have proposed a new method based on dicyanovinyl substituted phenanthridine moiety of 7 for selective and efficient recognition of biogenic primary amines (BPAs), based on the interaction between amine and the dicyanovinyl-linked phenanthridine moiety of 7. It can be cleaved quickly with significant changes in fluorescence (from orange to blue) that produced 7-imine with induced ratiometric fluorescence. UV–visible/fluorescence spectral titration, NMR, mass spectra and DFT spectroscopic studies were proved by the mechanism of amine sensing. Limit of detections 3.67 nM (DA), 28.3 nM (EDA), 65.3 nM (HA) and 15.8 nM (n-BA) are also obtained for this probe 7 with remarkable ratiometric fluorescence enhancement. Additionally, fluorescence test paper with probe (7) was also fabricated and utilized to detect amines.

Published
2020

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