Experimental insights on the coordination modes of coumarin-3-carboxilic acid towards Cr(III)-, Co(II)-, Ni(II)-, Cu(II)- and Zn(II): A detailed potentiometric and spectroscopic investigation in aqueous media

Malacaria, Luana; Bruno, Rosaria; Corrente, Giuseppina Anna; Armentano, Donatella; Furia, Emilia; Beneduci, Amerigo

doi:10.1016/j.molliq.2021.118302

Cited by 2 publications

(3 citation statements)

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“…This background salt was chosen to control the ionic strength due to its high inertia towards complexation [26]. Results are provided according This ligand can act as a monodentate via carboxylic moiety involving one or both oxygen atoms, as well as a bidentate ligand through the lactone and the carboxylic oxygen to realize a high stabilized 6-membered metallocycle [22].…”

Section: Potentiometric Measurementsmentioning

confidence: 99%

“…The complexation ability of coumarin-3-carboxylic acid towards selected metal cations in aqueous solutions at 37 • C and in 0.16 mol L −1 [i.e., inert salt NaCl or NaClO 4 depending on specific metal ions] has been reported [22][23][24][25]. In these previous investigations it has been verified that, with the single exception of Fe(III), HCCA exhibits only one mode of binding, in which the deprotonated carboxylic group acts as a bidentate chelating ligand.…”

Section: Potentiometric Measurementsmentioning

confidence: 99%

“…Previously, the biological action of coumarin-3-carboxylic acid (HCCA, Figure 1) has been potentiated through complexing with metals [21]. This ligand can act as a monodentate via carboxylic moiety involving one or both oxygen atoms, as well as a bidentate ligand through the lactone and the carboxylic oxygen to realize a high stabilized 6-membered metallocycle [22].…”

Section: Introductionmentioning

confidence: 99%

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Insights on Stability Constants and Structures of Complexes between Coumarin Derivatives and Pb(II) in Aqueous Media

Furia,

Lettera,

Napoli

et al. 2024

Molecules

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In the frame of a systematic study on the sequestering ability of natural antioxidants towards metal cations, here the complexation of coumarin-3-carboxilic acid (HCCA) with Pb(II) and the overall stability constants of the resulting complexes, at 37 °C and in 0.16 M NaClO4, are discussed. Reaction of Pb(ClO4)2 with HCCA in an aqueous medium at a pH range from 2 to 6 and various ratios (1:1–1:10) yielded the Pb–CCA complexes, which were characterized spectrometrically by laser desorption ionization mass spectrometry (LD-MS). LD-MS has provided the composition and structure of Pb–CCA species according to the speciation model proposed on the basis of the potentiometric data. The graphic representation of the complex’s concentration curves is given by the distribution diagram, which provides a whole depiction of the species present in the solution at the selected pH ranges.

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Section: Potentiometric Measurementsmentioning

confidence: 99%