Fluorescence quenching of four dyes [acridine orange (AO), rhodamine B (Rd B), rhodamine 110 (Rd 110), and rhodamine 640 (Rd 640)] by colloidal graphene oxide (GO) in phosphate buffer (pH 6.0) was studied. Dynamic and static quenching were analyzed using the Stern–Volmer equation. Static quenching by graphene oxide was observed for AO, Rd 640, and Rd B whereas mixed dynamic and static quenching was characteristic of Rd 110. The Stern–Volmer constant of dynamic quenching was 10 times less than that of static quenching. The measured association constants of the dyes with GO fell in the order 2540 (AO) > 495 (Rd 640) > 260 (Rd 110) > 144 L/g (Rd B). The value of the π–π-stacking interaction was strongly influenced by the phthalic fragment oriented perpendicular to the xanthene in the rhodamine dyes and the four alkyl groups of Rd B as a result of their torsional vibrations and rotational motions.
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Translated from Zhurnal Prikladnoi Spektroskopii, Vol. 85, No. 4, pp. 550–556, July–August, 2018.
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Povedailo, V.A., Ronishenko, B.V., Stepuro, V.I. et al. Fluorescence Quenching of Dyes by Graphene Oxide. J Appl Spectrosc 85, 605–610 (2018). https://doi.org/10.1007/s10812-018-0693-6
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DOI: https://doi.org/10.1007/s10812-018-0693-6