RAMESH K S
@adithyatech.edu.in
Assistant Professor/ Deparment of Chemistry
Adithya Institute of Technology
RESEARCH, TEACHING, or OTHER INTERESTS
Chemistry, Organic Chemistry, Spectroscopy, Physical and Theoretical Chemistry
Scopus Publications
Scholar Citations
Scholar h-index
Scholar i10-index
Scopus Publications
K. S. Ramesh, Saravanabhavan Munusamy, Shabbir Muhammad, Hamed Algarni, and Marimuthu Sekar
Springer Science and Business Media LLC
K.S. Ramesh, M. Saravanabhavan, Shabbir Muhammad, D. Edison, Mon-Shu Ho, M. Sekar, and Abdullah G. Al-Sehemi
Elsevier BV
K. S. Ramesh, M. Saravanakumar, R. Saravanan, Mohanraj Kumar, Jih-Hsing Chang, and Saravanabhavan Munusamy
Springer Science and Business Media LLC
Amsaveni Arumugam, Ramesh Shanmugam, Saravanabhavan Munusamy, Shabbir Muhammad, Hamed Algarni, and Marimuthu Sekar
American Chemical Society (ACS)
Two Schiff bases, (E)-4-((2-chlorobenzylidene)amino)-1,5-dimethyl-2-phenyl-1,2-dihydro-3H-pyrazol-3-one (4AAPOCB) and (E)-4-((4-chlorobenzylidene)amino)-1,5-dimethyl-2-phenyl-1,2-dihydro-3H-pyrazol-3-one (4AAPPCB), have been synthesized and grown as single crystals. Single-crystal X-ray diffraction analysis was employed to determine the crystal structure of the compounds, and the results suggest that the compounds crystallized into an orthorhombic crystal system having P212121 and Pbca space groups, respectively. Further, the crystallinity of the compounds was analyzed by the PXRD technique. The UV–vis–NIR spectra of the compounds demonstrate excellent transmittance in the entire visible region. The lower cutoff wavelengths of the compounds were determined to be 338 and 333 nm, respectively; additionally, optical band gaps of the compounds found were 4.60 and 4.35 eV. FTIR and NMR (1H and 13C) spectral techniques were utilized to analyze the molecular structure of the compounds. The compounds emit photoluminescence with broad emission bands with centers at 401 and 418 nm. The thermal stability and phase transitions were assessed through thermogravimetric methods. The phase transition prior to melting was indicated by the endothermic event at around 190 °C in the DTA curves of both crystals, and the same was observed in the DSC curves. The second harmonic efficiencies of the powdered compounds I and II were found to be 3.52 and 1.13 times better than that of the standard reference KDP. The 4AAPOCB and 4AAPPCB compounds showed isotropic polarizability amplitudes of 46.02 × 10–24 and 46.52 × 10–24 esu, respectively. The calculation of linear polarizability and NLO second-order polarizability (β) along with other optical parameters was performed for optimized geometries. The nonzero amplitudes of the average β values for compounds 4AAPOCB and 4AAPPCB were found to be 14.74 × 10–30 and 8.10 × 10–30 esu, respectively, which show a decent potential of the synthesized molecules for NLO applications. The calculated β amplitudes were further explained based on calculated electronic parameters like molecular electrostatic potentials, frontier molecular orbitals, molecular orbital energies, transition energies, oscillator strengths, and unit spherical representation of NLO polarizability. The current analysis emphasizes the significance of synthesized compounds as prospective candidates for optical and NLO applications through the use of experiments and quantum computations.
K. S. Ramesh, Saravanabhavan Munusamy, Shabbir Muhammad, Mari Sithambaram Karthikeyan, Abdullah G. Al-Sehemi, and M. Sekar
Springer Science and Business Media LLC
C. Sudhakar, Saravanabhavan Munusamy, Ramesh Shanmugam, Shabbir Muhammad, Saifeldin M. Siddeeg, Vishnu Nayak Badavath, Chandrasekar Sivakumar, and M. Sekar
Springer Science and Business Media LLC
A. Franklin Ebenazer, M. Saravanabhavan, K.S. Ramesh, Shabbir Muhammad, Abdullah G. Al-Sehemi, and N. Sampathkumar
Elsevier BV
C. Sudhakar, M. Saravanabhavan, K.S. Ramesh, V.N. Badavath, S. Chandrasekar, B. Babu, and M. Sekar
Elsevier BV
K.S. Ramesh, M. Saravanabhavan, M. Rajkumar, D. Edison, M. Sekar, Shabbir Muhammad, and Abdullah G. Al-Sehemi
Elsevier BV