Hypersensitive Transitions: A Greener Micellar Study of Tb(III)-Indole Derivative Complexes through Optical Absorption Spectra

Ramswaroop Regar, Sumit Ghasia, Hemendra Singh Bhandari

Abstract: Optical absorption spectra of Terbium(III)-complexes with Nitrogen and Oxygen containing ligand Indole derivative [viz: 1H-indole-3-carboxylic acid (I₃CA), 1-(1H-indole-3-yl)ethanone (3ATI), and 1H-indole-3-carbaldehyde (I₃CD)] have been studied and analyzed in non-micellar solvent (Alcohol+water) as well as micellar surfactant medium [Polyethylene glycol monododecyl ether (BRIJ35), Cetyltrimethylammonium bromide (CTAB), Sodium dodecyl sulphate (SDS)] at 298 K temperature. UV-Visible absorption spectra of metal-ligand complexes produce eight multiplet-to-multiplet transition bands in the 250?400 nm range. These transitions originate from the ⁷F₆ ground state and are obtained as ⁵H₆ ? ⁷F₆, ⁵H₇ ? ⁷F₆, ⁵D₁ ? ⁷F₆, ⁵L₈ ? ⁷F₆, ⁵L₉ ? ⁷F₆, ⁵G₅ ? ⁷F₆, ⁵L₁₀ ? ⁷F₆, and ⁵G₆ ? ⁷F₆ for Terbium(III)-indole derivatives complexes. The transition ⁵H₇ ? ⁷F₆ is highly sensitive as it has a high Oscillator Strength (P) with the non-ionic BRIJ35 micellar medium. The hypersensitivity of transitions and enhancements in spectral peaks are applicable in resolution techniques. In this optical absorption study, intensity parameters are studied by applying Judd-Ofelt theory. Covalency characters are assigned by four covalency parameters, ?, b_1/2, and ? for the studied metal-ligand complexes and are found better in green micellar medium. Green micellar solvents are safer for the environment.

Keywords: Oscillator strength, Micellar medium, Hypersensitive transition, Covalency parameters

How to Cite?: Ramswaroop Regar, Sumit Ghasia, Hemendra Singh Bhandari, "Hypersensitive Transitions: A Greener Micellar Study of Tb(III)-Indole Derivative Complexes through Optical Absorption Spectra", Volume 13 Issue 6, June 2024, International Journal of Science and Research (IJSR), Pages: 1936-1947, https://www.ijsr.net/getabstract.php?paperid=SR24066091725, DOI: https://dx.doi.org/10.21275/SR24066091725

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