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

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• 作者：Anand Parthasarathy ; Subhadip Goswami ; Thomas S. Corbitt ; Eunkyung Ji ; Dimitri Dascier ; David G. Whitten ; Kirk S. Schanze
• 刊名：ACS Applied Materials & Interfaces
• 出版年：2013
• 出版时间：June 12, 2013
• 年：2013
• 卷：5
• 期：11
• 页码：4516-4520
• 全文大小：267K
• 年卷期：v.5,no.11(June 12, 2013)
• ISSN：1944-8252

文摘

The photophysical properties of three cationic 蟺-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 鈭?CH₂)₃NMe₃⁺ groups. The oligomers absorb in the visible region due to their donor鈥揳cceptor鈥揹onor 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 鈮?4c.

Keywords:

conjugated oligomer; singlet oxygen; light activated biocide; donor鈭抋cceptor