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Helquat-Induced Chiroselective Aggregation of Au NPs

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Institute of Chemistry, Center for Nanoscience and Nanotechnology, The Hebrew University of Jerusalem, Jerusalem 91904, Israel
Institute of Organic Chemistry and Biochemistry, Academy of Sciences of the Czech Republic, v. v. i., Flemingovo n. 2, 166 10 Prague 6, Czech Republic
*(F.T.) E-mail: [email protected]. Phone: 420-220-183412. Fax: 420-220-183578. (I.W.) E-mail: [email protected]. Phone: 972-2-6585272. Fax: 972-2-6527715.
Cite this: Nano Lett. 2012, 12, 11, 5835–5839
Publication Date (Web):October 8, 2012
Copyright © 2012 American Chemical Society

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    Au nanoparticles (NPs) are functionalized with chiral (R) or (S) binaphthol phenylboronic acid ligands, (1a) or (1b). The (R)- or (S)-binaphthol phenylboronic acid ligands form donor–acceptor complexes with the chiral dicationic helicene, helquat (P)-HQ2+ or (M)-HQ2+, (2a) or (2b). The association constants between (1a)/(2a) and (1a)/(2b) correspond to (7.0 ± 0.5) × 105 M–1 and (2.5 ± 0.3) × 105 M–1, respectively, whereas the association constants between (1b)/(2b) and (1b)/(2a) correspond to (4.0 ± 0.5) × 105 M–1 and (1.8 ± 0.3) × 105 M–1, respectively. Chiroselective aggregation of chiral binaphthol phenylboronic acid-capped Au NPs triggered by the chiral helquats, is demonstrated.

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    CD spectra of the (R)- and the (S)-modified Au NPs, determination of the loading of the Au NPs with the respective binaphthol phenylboronic acid ligands, cyclic voltammogram of the helquat, determination of the binding constants, and Job’s plots corresponding to the binding of the (S)- or (R)-modified Au NPs in the presence of the different helquats. This material is available free of charge via the Internet at

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