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dc.contributor.authorCvijetic, Ilija
dc.contributor.authorPesic, Milos P.
dc.contributor.authorTodorov, Miljana D.
dc.contributor.authorJuranic, Ivan O.
dc.contributor.authorDrakulic, Branko J.
dc.contributor.authorVerbic, Tatjana
dc.contributor.authorZloh, Mire
dc.date.accessioned2018-08-16T00:14:00Z
dc.date.available2018-08-16T00:14:00Z
dc.date.issued2017-09-30
dc.identifier.citationCvijetic , I , Pesic , M P , Todorov , M D , Juranic , I O , Drakulic , B J , Verbic , T & Zloh , M 2017 , ' Tautomerism of 4-phenyl-2,4-dioxobutanoic acid. Insights from pH ramping NMR study and quantum chemical calculations ' , Structural Chemistry . https://doi.org/10.1007/s11224-017-1039-3
dc.identifier.issn1040-0400
dc.identifier.otherPURE: 12477550
dc.identifier.otherPURE UUID: d74aafaf-e83a-459e-82f6-cf8835d36ef9
dc.identifier.otherScopus: 85030176327
dc.identifier.urihttp://hdl.handle.net/2299/20398
dc.descriptionThis document is the Accepted Manuscript version of the following article: Cvijetić, I.N., Pešić, M.P., Todorov, M.D. et al, 'Tautomerism of 4-phenyl-2,4-dioxobutanoic acid. Insights from pH ramping NMR study and quantum chemical calculations', Structural Chemistry, September 2017. Under embargo. Embargo end date: 30 September 2018. The final publication is available at Springer via https://doi.org/10.1007/s11224-017-1039-3.
dc.description.abstractAryldiketo acids (ADKs) exhibit the variety of biological activities, mainly due to large affinity toward divalent metal ions. Metal complexation ability of ADKs, as well as interactions with proteins, depend on tautomeric form present in solution. The main aim of this study was to fully explore the tautomeric preferences of 4-phenyl-2,4-dioxobutanoic acid (4PDA), as ADKs representative, in aqueous media at different pH values. 1D and 2D NMR spectroscopy in combination with quantum chemical calculations was applied in order to better understand the tautomeric preferences of 4PDA. The data in highly acidic media are especially interesting since there are no such findings in the literature due to low solubility of ADKs in molecular form. At low pH values, where 4PDA is unionized, the most abundant tautomeric form is enol with keto group closer to phenyl ring. At higher pH values, mixture of two 4PDA ionic forms coexists in solution. Their ratio calculated according to NMR data fits the values predicted using two experimentally determined pKa values. Based on the complexity of 1H NMR spectrum of monoanionic 4PDA form, coexistence of two stable rotamers was assumed. In an alkaline media 4PDA is mostly present in dianionic form. As π-electrons of dianion are delocalized over an entire keto-enol moiety, spectral distinction between tautomers was not possible. Quantum chemical calculations were used to predict relative stability of tautomers. The predictions were in good accordance with experimental results only in case when explicit water molecule was included in calculations.en
dc.format.extent12
dc.language.isoeng
dc.relation.ispartofStructural Chemistry
dc.subjectAryldiketo acid
dc.subjectketo-enol tautomerism
dc.subjectNMR spectroscopy
dc.subjectquantum chemical calculations
dc.subjectAnalytical Chemistry
dc.subjectPhysical and Theoretical Chemistry
dc.titleTautomerism of 4-phenyl-2,4-dioxobutanoic acid. Insights from pH ramping NMR study and quantum chemical calculationsen
dc.contributor.institutionSchool of Life and Medical Sciences
dc.contributor.institutionDepartment of Pharmacy, Pharmacology and Postgraduate Medicine
dc.contributor.institutionCentre for Hazard Detection and Protection Research
dc.contributor.institutionMedicinal and Analytical Chemistry
dc.contributor.institutionPsychopharmacology, Drug Misuse and Novel Psychoactive Substances Unit
dc.contributor.institutionCentre for Health Services and Clinical Research
dc.description.statusPeer reviewed
dc.date.embargoedUntil2018-09-30
rioxxterms.versionAM
rioxxterms.versionofrecordhttps://doi.org/10.1007/s11224-017-1039-3
rioxxterms.typeJournal Article/Review
herts.preservation.rarelyaccessedtrue


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