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AuthorSivakumar, V.
AuthorPonnamma, Deepalekshmi
AuthorHussein, Yasser H. A.
Available date2018-02-07T11:21:26Z
Publication Date2017-02-15
Publication NameSpectrochimica Acta - Part A: Molecular and Biomolecular Spectroscopy
Identifierhttp://dx.doi.org/10.1016/j.saa.2016.11.001
CitationSivakumar, V., Ponnamma, D., & Hussein, Y. H. (2017). Photoinduced electron transfer interaction of anthraquinones with aniline quenchers: Influence of methyl substitution in aniline donors. Spectrochimica Acta Part A: Molecular and Biomolecular Spectroscopy, 173, 931-938. 10.1016/j.saa.2016.11.001
ISSN1386-1425
URIhttp://hdl.handle.net/10576/6251
Abstract© 2016 Elsevier B.V. Photoinduced electron transfer between triplet state of 9,10-anthraquinone (AQ) and its two derivatives: 2-chloro-9,10-anthraquinone (CAQ) and sodium anthraquinone-2-sulfonate (AQS) and ground state aniline (AN) and its dimethyl substitutions: 2,3-dimethylaniline (2,3-DMA), 2,6-dimethylaniline (2,6-DMA), 3,5-dimethylaniline (3,5-DMA) and N,N-dimethylaniline (N,N-DMA) is studied using nanosecond laser flash photolysis at room temperature. Detection of radical bands of quinone anions and aniline cations along with their formation and/or decay kinetics are used to confirm the electron transfer (ET) process. In MeCN medium, AN quenches the triplet state of CAQ (CAQ T ) but not the triplets AQ T or AQS T . However in aqueous medium, AN quenches AQS T and forms radical ion pair. All the DMAs can react through ET with all the triplet quinones at different degrees of efficiency in MeCN medium. Noticeably, the ring substituted DMAs are less efficient in electron donation to AQ T or AQS T while the N,N-DMA shows high efficiency in donating electron to all triplet quinones in MeCN medium. Charge distribution of donor molecules, in MeCN medium is calculated using density functional theory (DFT), and shows an enhancement of electron density of the ring of N,N-DMA, making it an ideal electron donor for ET studies compared to other DMAs. This systematic selection and usage of anilines with electrochemically tunable quinones can be viewed as a working model of donor-acceptor system that can be utilized in photoinduced ET applications.
Languagear
PublisherElsevier
SubjectAniline
Anthraquinone
Photoinduced electron transfer
Photolysis
Triplet quenching
TitlePhotoinduced electron transfer interaction of anthraquinones with aniline quenchers: Influence of methyl substitution in aniline donors
TypeArticle
Pagination931-938
Volume Number173
ESSN1873-3557
dc.accessType Abstract Only


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