Photophysics and Light-Activated Biocidal Activity of Visible-Light-Absorbing Conjugated Oligomers

The photophysical properties of three cationic π-conjugated oligomers were correlated with their visible light activated biocidal activity vs S. aureus. The oligomers contain three arylene units (terthiophene, 4a; thiophene-benzotriazole-thiophene, 4b; thiophene-benzothiadiazole-thiophene, 4c) cappe...

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Published inACS applied materials & interfaces Vol. 5; no. 11; pp. 4516 - 4520
Main Authors Parthasarathy, Anand, Goswami, Subhadip, Corbitt, Thomas S, Ji, Eunkyung, Dascier, Dimitri, Whitten, David G, Schanze, Kirk S
Format Journal Article
LanguageEnglish
Published United States American Chemical Society 12.06.2013
Subjects
Bacterial Infections - prevention & control
Disinfectants - chemistry
Drug Resistance, Bacterial
Humans
Light
Photochemical Processes
Polymers - chemistry
Singlet Oxygen - chemistry
Thiophenes - chemistry
conjugated oligomer
light activated biocide
singlet oxygen
donor−acceptor
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Summary:The photophysical properties of three cationic π-conjugated oligomers were correlated with their visible light activated biocidal activity vs S. aureus. The oligomers contain three arylene units (terthiophene, 4a; thiophene-benzotriazole-thiophene, 4b; thiophene-benzothiadiazole-thiophene, 4c) capped on each end by cationic −(CH2)3NMe3 + groups. The oligomers absorb in the visible region due to their donor–acceptor–donor electronic structure. Oligomers 4a and 4b have high intersystem crossing and singlet oxygen sensitization efficiency, but 4c has a very low intersystem crossing efficiency and it does not sensitize singlet oxygen. The biocidal activity of the oligomers under visible light varies in the order 4a > 4b ≈ 4c.
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ISSN:1944-8244
1944-8252
DOI:10.1021/am400282p