International Science Community Association Research Journal of Recent Sciences 15 3 2026 07 2 Study of Photophysical Properties of Coumarin 4-(4-Methoxy-Phenoxymethyl)-5,7-Dimethyl-Chromen-2-one (C19H18O4) and Estimation of Ground-State and Excited-State Dipole Moments 110 114 EN Sahu Suresh 1 Government Engineering College, Ajmer, Rajasthan, India Kumar Vinod 1 NTPC Energy Technology Research Alliance (NETRA), Plot No. E-3, Ecotech-II, Udyog Vihar, Greater Noida -201306, Uttar Pradesh, India Aggarwal Akanksha 2 NTPC Energy Technology Research Alliance (NETRA), Plot No. E-3, Ecotech-II, Udyog Vihar, Greater Noida -201306, Uttar Pradesh, India Kulshershtha Amit 3 NTPC Energy Technology Research Alliance (NETRA), Plot No. E-3, Ecotech-II, Udyog Vihar, Greater Noida -201306, Uttar Pradesh, India Kumar Manish 4 NTPC Energy Technology Research Alliance (NETRA), Plot No. E-3, Ecotech-II, Udyog Vihar, Greater Noida -201306, Uttar Pradesh, India Kumar Shanta 5 NTPC Energy Technology Research Alliance (NETRA), Plot No. E-3, Ecotech-II, Udyog Vihar, Greater Noida -201306, Uttar Pradesh, India Tripathi Raj Kumar 6 NTPC Energy Technology Research Alliance (NETRA), Plot No. E-3, Ecotech-II, Udyog Vihar, Greater Noida -201306, Uttar Pradesh, India Saini Yashwant Kumar 7 NTPC Energy Technology Research Alliance (NETRA), Plot No. E-3, Ecotech-II, Udyog Vihar, Greater Noida -201306, Uttar Pradesh, India Gupta Shyam Manohar 8 NTPC Energy Technology Research Alliance (NETRA), Plot No. E-3, Ecotech-II, Udyog Vihar, Greater Noida -201306, Uttar Pradesh, India Ram Anshu Beulah 1 Department of Biotechnology, Nrupathunga University, Nrupathunga Road, Bangalore, Karnataka 560001, India Kour Gurshish 2 Clinical Microbiology Division, Indian Institute of Integrative Medicine (CSIR), Canal Road, Jammu 180 001, India P. Priya 1 Department of PG studies in Biotechnology, Nrupathunga University, Bengaluru, Karnataka, India P.R. Druthi 2 Department of PG studies in Biotechnology, Nrupathunga University, Bengaluru, Karnataka, India M. Jeevitha 3 Department of PG studies in Biotechnology, Nrupathunga University, Bengaluru, Karnataka, India Kabhade Sarina P. 4 Department of PG studies in Biotechnology, Nrupathunga University, Bengaluru, Karnataka, India Stella Bhupanapadu Sunkesula Mary 5 Insearch Laboratory, Bengaluru, Karnataka, India M. Jeevitha 1 Department of Biotechnology, Nrupathunga University, Bengaluru, Karnataka, India P.R. Druthi 2 Department of Biotechnology, Nrupathunga University, Bengaluru, Karnataka, India P. Priya 3 Department of Biotechnology, Nrupathunga University, Bengaluru, Karnataka, India Kabhade Sarina P 4 Department of Biotechnology, Nrupathunga University, Bengaluru, Karnataka, India Stella Bhupanapadu Sunkesula Mary 5 Insearch Laboratory, Bengaluru, Karnataka, India P. Rajeshwari 1 Government Science College, Chitradurga, Karnataka, India Raveesha K.A. 2 Life Sciences, JSS Academy of Higher Education and Research (JSSAHER) Mysuru, Karnataka, India B. Kavitha 1 Department of Microbiology, Nrupathunga University, Bengaluru, Karnataka, India Shetty Chandana R 2 Department of Microbiology, Nrupathunga University, Bengaluru, Karnataka, India R. Pavithra 3 Department of Microbiology, Nrupathunga University, Bengaluru, Karnataka, India V. Vanaja 4 Department of Microbiology, Nrupathunga University, Bengaluru, Karnataka, India Varshini Vidhya 5 Department of Microbiology, Nrupathunga University, Bengaluru, Karnataka, India N. Anuroopa 1 Department of Microbiology, Nrupathunga University, Bengaluru, Karnataka, India R. Prajwal 2 Department of Microbiology, Nrupathunga University, Bengaluru, Karnataka, India M. Kishore Rao 3 Department of Microbiology, Nrupathunga University, Bengaluru, Karnataka, India C. Deepika 4 Department of Microbiology, Nrupathunga University, Bengaluru, Karnataka, India M. Jayashree 5 Department of Microbiology, Nrupathunga University, Bengaluru, Karnataka, India P. Rashmi 6 Department of Microbiology, Nrupathunga University, Bengaluru, Karnataka, India N. Hithyshi 1 Department of Post-Graduate Studies in Zoology, Nrupathunga University, Bengaluru, India B.C. Shashikanth 2 Department of Post-Graduate Studies in Zoology, Nrupathunga University, Bengaluru, India D.A. Uday Kumar 3 Department of Post-Graduate Studies in Zoology, Nrupathunga University, Bengaluru, India H.M. Mohan Kumar 4 Department of Post-Graduate Studies in Zoology, Nrupathunga University, Bengaluru, India S. Priya 1 Department of Computer Science, Government First Grade College, Domlur Shanthi Nagar, Bengaluru, India Urs Bharathi Shettahalli Nagaraje 1 Department of Mathematics, Government Science College, Chitradurga, Karnataka, India Gonasagi Pushpalata 1 Department of Computer Science, Govt. First Grade College Mahagaon Cross, Kalaburagi, Karnataka, India L.A. Priyanka 1 St Pauls College, Bangalore, Karnataka, India C. Subramani 2 GFGC and PG centre Shankaranarayana, Udupi, Karnataka, India N. Asha 1 Department of Computer Science, Nrupathunga University (Formerly Government Science College), Bangalore, Karnataka, India S. Sinchana 2 Department of CSE, BGS College of Engineering and Technology, Bangalore, Karnataka, India B.S. Jyothsna 1 Department of Botany, Government Science College, N.T. Road, Bangalore-01, Karnataka, India Gonchigara Thippeswamy 1 Department of Mathematics, Government First Grade College, Harapanahalli, Vijayanagara Dt.-583131, Karnataka, India Lingappa Alageri 1 Government First Grade College, Sandur- 583119, Karnataka, India Hanagodimath S.M. 2 Department of PG Studies and Research in Physics, Gulbarga University, Kalaburagi-585 106, Karnataka, India > Research Article 2026 4 10 2026 07 2 The photophysical properties of coumarin-4-(4-Methoxy-Phenoxymethyl)-5,7-dimethyl-chromen-2-one (C19H18O4) (4MPDC) at room temperature are investigated in pure polar and nonpolar solvents using Gaussian 16W software with the B3LYP/6-31 basis set. The influence of pure solvents on spectral characteristics is investigated by applying theories such as the Lippert-Mataga polarity function, Reichardt's microscopic solvent polarity parameter, and Kamlet and Catalan's multiple linear regression techniques. The main role of solute-solvent interactions in pure solvents depend on particularly dielectric interaction and hydrogen bonding. Hydrogen bonding interactions dominate the contribution of dielectric interactions. The electric dipole moments of both the ground state and excited states have been estimated using the Solvatochromic method. The value of the electric dipole moment of the excited state and the red shifts of emission spectra show that the emitting singlet state has an intramolecular charge transfer (ICT) character. The DFT data showed that λ_max resulted from the support of the highest occupied molecular orbital to the lowest unoccupied molecular orbital transition. We conclude that polar solvents change the fluorescent properties of coumarin. Copyright@ International Science Community Association