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dc.contributor.authorValente, J.
dc.contributor.authorBuntine, Mark
dc.contributor.authorLincoln, S.
dc.contributor.authorWard, D.
dc.date.accessioned2017-01-30T12:10:48Z
dc.date.available2017-01-30T12:10:48Z
dc.date.created2015-09-29T01:51:48Z
dc.date.issued2007
dc.identifier.citationValente, J. and Buntine, M. and Lincoln, S. and Ward, D. 2007. UV–Vis and fluorimetric Al3+, Zn2+, Cd2+ and Pb2+ complexation studies of two 3-hydroxyflavones and a 3-hydroxythioflavone. Inorganica Chimica Acta. 360 (10): pp. 3380-3386.
dc.identifier.urihttp://hdl.handle.net/20.500.11937/18940
dc.identifier.doi10.1016/j.ica.2007.04.011
dc.description.abstract

The complexation of Al3+, Zn2+, Cd2+ and Pb2+ by the 3-hydroxyflavones: 3-hydroxy-2-(2-methoxyphenyl)-4H-1-benzopyran-4-one (H1) and 3-hydroxy-2-(4-methoxyphenyl)-4H-1-benzopyran-4-one (H2), and by the 3-methoxythioflavone: 3-hydroxy-2-(2-methoxyphenyl)-4H-1-benzopyran-4-thione (H3) have been studied spectrophotometrically and fluorimetrically to determine the corresponding complexation constants, Ksp and Kfl, in 5:95 water:ethanol (v/v) solution for which [HClO4] was either 10-2 or 10-5 mol dm-3 and I = 0.10 mol dm-3 (NaClO4) at 298.2 K. Complexation occurs dominantly through the deprotonated ligand for [Al(1)]2+ and [Al(2)]2+ for which log Ksp = 4.51 and 4.73, respectively, in 10-2 mol dm-3 HClO4 and 4.21 and 4.61 in 10-5 mol dm-3 HClO4. For Pb2+ complexation by H1, H2 and H3 is characterized by log Ksp = 2.20, 2.57 and 3.22, respectively, in 10-2 mol dm-3 HClO4 and 4.70, 5.38 and 5.74 in 10-5 mol dm-3 HClO4. Equilibrium mixtures of [Pb(H1)]2+ and [Pb1]+, [Pb(H2)]2+ and [Pb2]+, and [Pb(H3)]2+ and [Pb3]+ appear to be formed. Complexation of Zn2+ and Cd2+ by all three ligands was only detected in 10-5 mol dm-3 HClO4. For Zn2+ complexation by H1, H2 and H3 log Ksp = 3.22, 3.74 and 4.46 and for Cd2+ the corresponding values are 2.39, 2.40 and 3.72 for Cd2+. Only [Al1]2+ and [Al2]2+ show significant fluorescence and are characterized by log Kfl = 6.30 and 7.49 in 10-2 mol dm-3 HClO4.

dc.publisherElsevier
dc.subjectFluorescence
dc.subject3-Hydroxyflavones
dc.subject3-Hydroxythioflavones
dc.subjectStability constants
dc.subjectMetal complexes
dc.titleUV–Vis and fluorimetric Al3+, Zn2+, Cd2+ and Pb2+ complexation studies of two 3-hydroxyflavones and a 3-hydroxythioflavone
dc.typeJournal Article
dcterms.source.volume360
dcterms.source.number10
dcterms.source.startPage3380
dcterms.source.endPage3386
dcterms.source.issn00201693
dcterms.source.titleInorganica Chimica Acta
curtin.accessStatusFulltext not available


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