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Photocatalytic Generation of Hydroge...

Weerarathna, Kankanamge Lakshani Jayaprada,

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Photocatalytic Generation of Hydrogen Peroxide Using Tellurorosamine Dyes /

Record Type:	Electronic resources : Monograph/item
Title/Author:	Photocatalytic Generation of Hydrogen Peroxide Using Tellurorosamine Dyes // Kankanamge Lakshani Jayaprada Weerarathna.
Author:	Weerarathna, Kankanamge Lakshani Jayaprada,
Description:	1 electronic resource (99 pages)
Notes:	Source: Masters Abstracts International, Volume: 82-09.
Contained By:	Masters Abstracts International82-09.
Subject:	Chemistry. -
Online resource:	https://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=28315215
ISBN:	9798582509998

Photocatalytic Generation of Hydrogen Peroxide Using Tellurorosamine Dyes /
Weerarathna, Kankanamge Lakshani Jayaprada,

Photocatalytic Generation of Hydrogen Peroxide Using Tellurorosamine Dyes /Kankanamge Lakshani Jayaprada Weerarathna. - 1 electronic resource (99 pages)

Source: Masters Abstracts International, Volume: 82-09.

A tellurorhodamine chromophore having a xanthylium core and a mesityl group attached at the C-9 position (Te(II) mesi dye) was used in this present study to investigate the photophysical and electrochemical characteristics during its oxidation from +2 to +4 state. The photo-oxidation of this dye at pH 6 in 75% methanol / 25% water medium stabilized with acetic acid yielded telluroxide and this could be observed using UV-visible spectroscopy. Further characterization of the isolated Te(IV) mesityl xanthylium dye (Te(IV) mesiO dye) was carried out using 1H NMR spectroscopy and FTIR studies. The photocatalytic cycle proposed for this oxidation suggests that the reaction of the Te(II) mesi dye with singlet oxygen and water liberates hydrogen peroxide and that evolution was observed using NaI titration. Chemical oxidation of Te(II) mesi dye was carried out using hydrogen peroxide where it yielded the Te(IV) mesiO dye spontaneously. The bromination and halogenation of the Te(II) dye in ambient temperature showed the spectral changes in UV visible spectroscopy denoting the oxidative addition of halogen on Te atom. They were further characterized using 1H NMR spectroscopy and FTIR studies. Cyclic voltammetry, spectroelectrochemical studies and bulk electrolysis experiments were carried out on Te(II) mesi dye and Te(IV) mesiO dye to study the oxidation-reduction events taking place and the absorbance band changes in UV-visible spectroscopy with the change in potentials were used to identify the possibilities for the associated transient chemical species in the redox events.

English

ISBN: 9798582509998Subjects--Topical Terms:

516420
Chemistry.
Subjects--Index Terms:

Hydrogen peroxide generation

Photocatalytic Generation of Hydrogen Peroxide Using Tellurorosamine Dyes /
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100 1 $a Weerarathna, Kankanamge Lakshani Jayaprada, $e author. $0 (orcid)0000-0003-1084-9844 $3 3824227
245 1 0 $a Photocatalytic Generation of Hydrogen Peroxide Using Tellurorosamine Dyes / $c Kankanamge Lakshani Jayaprada Weerarathna.
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520 $a A tellurorhodamine chromophore having a xanthylium core and a mesityl group attached at the C-9 position (Te(II) mesi dye) was used in this present study to investigate the photophysical and electrochemical characteristics during its oxidation from +2 to +4 state. The photo-oxidation of this dye at pH 6 in 75% methanol / 25% water medium stabilized with acetic acid yielded telluroxide and this could be observed using UV-visible spectroscopy. Further characterization of the isolated Te(IV) mesityl xanthylium dye (Te(IV) mesiO dye) was carried out using 1H NMR spectroscopy and FTIR studies. The photocatalytic cycle proposed for this oxidation suggests that the reaction of the Te(II) mesi dye with singlet oxygen and water liberates hydrogen peroxide and that evolution was observed using NaI titration. Chemical oxidation of Te(II) mesi dye was carried out using hydrogen peroxide where it yielded the Te(IV) mesiO dye spontaneously. The bromination and halogenation of the Te(II) dye in ambient temperature showed the spectral changes in UV visible spectroscopy denoting the oxidative addition of halogen on Te atom. They were further characterized using 1H NMR spectroscopy and FTIR studies. Cyclic voltammetry, spectroelectrochemical studies and bulk electrolysis experiments were carried out on Te(II) mesi dye and Te(IV) mesiO dye to study the oxidation-reduction events taking place and the absorbance band changes in UV-visible spectroscopy with the change in potentials were used to identify the possibilities for the associated transient chemical species in the redox events.
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653 $a Hydrogen peroxide generation
653 $a Photo-catalysis
653 $a Photo-oxidation
653 $a Tellurorosamine dyes
653 $a Xanthylium dyes
690 $a 0485
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710 2 $a State University of New York at Buffalo. $b Chemistry. $e degree granting institution. $3 3824228
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