Journal
ACS APPLIED MATERIALS & INTERFACES
Volume 5, Issue 11, Pages 4516-4520Publisher
AMER CHEMICAL SOC
DOI: 10.1021/am400282p
Keywords
conjugated oligomer; singlet oxygen; light activated biocide; donor-acceptor
Funding
- Defense Threat Reduction Agency [HDTRA 1-11-1-0004]
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The photophysical properties of three cationic pi-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)(3)NMe3+ group. 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 approximate to 4c.
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