Monolayer-protected clusters with fluorescent dansyl ligands
Langmuir, ISSN: 0743-7463, Vol: 16, Issue: 14, Page: 5949-5954
2000
- 111Citations
- 39Captures
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Article Description
Monolayer-protected Au cluster (MPC) molecules with mixed monolayers of alkanethiolate and ω-carboxylalkanethiolate ligands were functionalized with the fluorescent label dansyl cadaverine. The emission intensity per MPC-attached dansyl group varies with (a) the number of dansyl sites per MPC (i.e., loading, 4 to 24), (b) with the linker chainlength between Au core and dansyl site, and (c) with chainlengths of alkanethiolates in the surrounding MPC monolayer coating. Emission intensity per MPC-attached dansyl group increases with loading and with the length of core-dansyl linker chains when the surrounding alkanethiolate monolayers have chain lengths equal to or greater than the linker. These results are interpreted in terms of distance-dependent energy transfer from the excited dansyl label to the metal-like MPC core and various steric constraints on thermal fluctuations of linker chains that influence the distance of approach of the label to the core. Correction for self-absorption by the highly colored MPC solution was necessary. Emission intensities of MPC-attached dansyl labels are lower than those from equivalent concentrations of dansyl units and MPCs as unattached cosolutes.
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