Cucurbit[7]uril Disrupts Aggregate Formation Between Rhodamine B Dyes Covalently Attached to Glass Substrates |
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Authors: | Ronald L Halterman Jason L Moore Wai Tak Yip |
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Institution: | (1) Department of Chemistry and Biochemistry, 101 Stephenson Parkway, University of Oklahoma, Norman, OK 73019, USA |
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Abstract: | Dye aggregation is detrimental to the performance of high optical density dye-doped photonic materials. To overcome this challenge,
the ability of cucurbit7]uril (CB7) as a molecular host to disrupt aggregate formation on glass substrates was examined.
Rhodamine B was covalently attached to glass slides by initially coating the surface with azidohexylsiloxane followed by copper-catalyzed
“click” triazole formation with rhodamine B propargyl ester. The absorption and emission spectra of rhodamine B coated slides
in water indicated diverse heterogeneous properties as surface dye density varied. Fluorescence quenching due to dye aggregation
was evident at high surface dye density. Addition of aqueous cucurbit7]uril (CB7) to the surface-tethered dyes perturbed
the spectra to reveal a considerable reduction in heterogeneity, which suggested that the presence of a surface in close proximity
does not significantly impair CB7’s ability to complex with tethered rhodamine B. |
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