Alkoxy-Terminated Si Surfaces: A New Reactive Platform for the Functionalization and Derivatization of Silicon Quantum Dots

by Purkait, Tapas K.; Iqbal, Muhammad; Islam, Muhammad Amirul; Mobarok, Md Hosnay; Gonzalez, Christina M.; Hadidi, Lida; Veinot, Jonathan G. C.

JOURNAL OF THE AMERICAN CHEMICAL SOCIETY, 138(22), pg 7114-7120, DOI: 10.1021/jacs.6b03155

Alkoxy-terminated silicon quantum dots (SiQDs) were synthesized via hydrosilylation of aliphatic ketones on hydride-terminated SiQD (H-SiQD) surfaces under microwave-irradiation. Aromatic ketones undergo hydrosilylation on H-SiQD surfaces at room temperature without requiring any catalyst. The alkoxy-terminated SiQDs are soluble in organic solvents, colloidally stable, and show bright and size dependent photoluminescence (PL). The alkoxy-functionalized silicon surfaces were used as reactive platform for further functionalization via unprecedented ligand exchange of the alkoxy-surface groups with alkyl or alkenyl-surface groups in the presence of BH3 center dot THF. Proton nuclear magnetic resonance (1H NMR), Fourier transform infrared (FTIR), and X-ray photoelectron spectroscopy (XPS) spectroscopy confirmed alkoxy-terminated surfaces and their ligand exchange reactions in the presence of various alkenes and alkynes.

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