Exploring solvatochromism in Nile Blue 690 dye: Evaluating dipole moments across the ground and excited states

Darukaswamy Tulahalli Hirematada; Mallikarjun Kalagouda Patil; Sanjeev Ramchandra Inamdar; Kotresh Mare Goudar

doi:10.5155/eurjchem.15.2.178-185.2533

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Published: Jun 30, 2024

DOI: https://doi.org/10.5155/eurjchem.15.2.178-185.2533

Keywords:

Nile blue 690, Dipole moment, Solvatochromism, Bakhshiev correlation technique, Lippert-Mataga correlation technique, Kawski-Chamma-Viallet correlation technique

Section

Research Article

Issue

Vol. 15 No. 2 (2024): June 2024

Dates

Received 2024-02-25
Accepted 2024-05-08
Published 2024-06-30

Darukaswamy Tulahalli Hirematada

Department of Physics, Faculty of Pure Science, Vijayanagara Sri Krishnadevaraya University, Ballari-583105, Karnataka, India

https://orcid.org/0009-0009-5984-8798

Mallikarjun Kalagouda Patil

Department of Studies in Physics, Faculty of Pure Science, Laser Spectroscopic Laboratory, Karnatak University, Dharwad-580003, Karnataka, India

https://orcid.org/0000-0001-7126-9486

Sanjeev Ramchandra Inamdar

Department of Studies in Physics, Faculty of Pure Science, Laser Spectroscopic Laboratory, Karnatak University, Dharwad-580003, Karnataka, India

https://orcid.org/0000-0003-3398-4897

Kotresh Mare Goudar

Department of Physics, Faculty of Pure Science, Vijayanagara Sri Krishnadevaraya University, Ballari-583105, Karnataka, India

https://orcid.org/0000-0001-8738-2221

Abstract

This study investigates the photophysical properties of Nile Blue 690 (NB-690) dye using spectroscopic techniques. Absorption and fluorescence spectroscopy were used to analyze NB-690, revealing pronounced bathochromic shifts in both absorption and fluorescence spectra, indicative of the π → π* transition. The study focuses on estimating ground- and excited-state dipole moments of NB-690 through solvatochromic shifts in absorption and fluorescence spectra. Various computational methods, including the Bilot-Kawski approach for ground state dipole moment computation, and the Reichardt correlation, the Bakhshiev, the Lippert-Mataga, and the Kawski-Chamma-Viallet methods for calculating the excited state dipole moment, were utilized. The results demonstrate excited-state dipole moment values of 6.922, 5.529, 5.529, 5.529, and 4.615 D, respectively, using the Lippert-Mataga, Bakhshiev, Kawski-Chamma-Viallet and solvent polarity correlation approaches. Significantly, the excited state dipole moment surpasses the ground state dipole moment, attributed to the significant π-electron density redistribution upon excitation. Intriguingly, both excited- and ground-state dipole moments align parallel to each other at a 0° angle. In general, these findings underscore the potential utility of NB-690 in optoelectronic applications, highlighting its responsiveness to environmental signals and providing valuable information for further exploration in the field.

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Hirematada, D. T.; Patil, M. K.; Inamdar, S. R.; Goudar, K. M. Exploring Solvatochromism in Nile Blue 690 Dye: Evaluating Dipole Moments across the Ground and Excited States. Eur. J. Chem. 2024, 15, 178-185.

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Supporting Agencies

Karnatak University, Dharwad-580003, Karnataka, India

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