Calcium complex of 2,5-dihydroxybenzoic acid (gentisic acid): synthesis, crystal structure, and spectroscopic properties

Kalinowska, Monika; Mazur, Liliana; Regulska, E.; Korczak, A.; Świderski, Grzegorz; Lewandowski, W.

doi:10.1080/00958972.2016.1197389

Cited by 5 publications

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References 39 publications

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“…DHBA belongs to the group of plant antioxidants that are extensively studied due to their possible application in medicine, pharmacy, food industry, and so on. [ 45–47 ] Additionally, DHBA has electron‐donating as well as an electron‐acceptor group and is recognized as a fluorescent probe molecule in organic synthesis. [ 38,48 ]…”

Section: Introductionmentioning

confidence: 99%

Revisiting the photochemistry 2,5‐dihydroxy benzoic acid (gentisic acid): Solvent and pH effect

Adhikari

Joshi

et al. 2020

J of Physical Organic Chem

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In the present study, we have reinvestigated photochemistry of 2,5‐dihydroxy benzoic acid (DHBA) in a series of organic solvents of different polarities and the aqueous solution of varying pH from 1 to 14. The investigation was carried out using steady‐state and nanosecond (ns) time‐domain fluorescence measurement techniques at room temperature. Some hitherto not explored spectral features with new insight on different forms of DHBA are reported. It is found that DHBA exists as monoanionic and neutral forms in various polar protic, aprotic, and nonpolar solvents. In aqueous solution (pH 1 to 14), neutral, monoanionic, and dianion forms are found to be responsible for the observed optical spectral profiles. The observed significant Stokes shift in emission is attributed to species undergoing excited‐state intramolecular proton transfer (ESIPT) in different solvents. The analysis presented in this work elucidates and validate the presence of various species and conformers of DHBA.

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Section: Introductionmentioning

confidence: 99%