title: Cucurbit[7]uril disrupts aggregate formation between rhodamine B dyes covalently attached to glass substrates.
abstract: Dye aggregation is detrimental to the performance of high optical density dye-doped photonic materials. To overcome this challenge, the ability of cucurbit[7]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 cucurbit[7]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.
authors.affiliation: Department of Chemistry and Biochemistry, 101 Stephenson Parkway, University of Oklahoma, Norman, OK 73019, USA. RHalterman@ou.edu
authors.forename: Ronald L
authors.initials: RL
authors.lastname: Halterman
authors.forename: Jason L
authors.initials: JL
authors.lastname: Moore
authors.forename: Wai Tak
authors.initials: WT
authors.lastname: Yip
mesh_terms: D001952:Bridged-Ring Compounds / Q000737:chemistry*; D005453:Fluorescence; D005898:Glass / Q000737:chemistry; D007093:Imidazoles / Q000737:chemistry*; D015394:Molecular Structure; D012235:Rhodamines / Q000737:chemistry*; D013050:Spectrometry, Fluorescence; D013499:Surface Properties; D047028:Macrocyclic Compounds; D000099246:Cucurbit(n)urils
chemical_list: D001952:Bridged-Ring Compounds; D007093:Imidazoles; D012235:Rhodamines; C456276:cucurbit(7)uril; D047028:Macrocyclic Compounds; D000099246:Cucurbit(n)urils; C029773:rhodamine B