Charge-transfer complexation: A highly effective way towards chiral nanoparticles endowed by intrinsically chiral helicene and enantioselective SERS detection

0575451 - ÚCHP 2024 RIV CH eng J - Journal Article
Guselnikova, O. - Elashnikov, R. - Švorčík, V. - Záruba, K. - Jakubec, Martin - Žádný, Jaroslav - Storch, Jan - Lyutakov, O.
Charge-transfer complexation: A highly effective way towards chiral nanoparticles endowed by intrinsically chiral helicene and enantioselective SERS detection.
Sensors and Actuators B - Chemical. Roč. 394, 1 NOV (2023), č. článku 134332. E-ISSN 0925-4005
R&D Projects: GA ČR(CZ) GA20-19353S
Grant - others:RSF(RU) RSF 23–73-00117
Institutional support: RVO:67985858
Keywords : chirality * plasmon * helicene
OECD category: Organic chemistry
Impact factor: 8.4, year: 2022
Method of publishing: Open access with time embargo

An ordered chiral gold nanoparticle (AuNPs) array was prepared by the treatment of achiral sphere-shaped gold nanoparticles endowed with electron-accepting dinitro-phenyl (DNP) groups complexing with enantiomers of [6]helicene representing electron donors with strong chiroptical properties. Such surface-functionalization utilizes the principles of charge-transfer (CT) interaction. The incorporation of [6]helicene molecules with unique electronic and optical properties and subsequent arrangement of AuNPs caused chirality induction to intrinsically non-chiral plasmon-active nanostructures. The created nanostructures enabled the excitation of chiral plasmon and its application in highly sensitive enantioselective detection of small chiral molecules by surface-enhanced Raman spectroscopy (SERS). The chiral plasmonic response of such a system was shown to be fully controlled via the helicity of the parent [6]helicene. Upon calibration, it allowed us to directly determine the enantiomeric composition of non-racemic mixtures of (R)/(S)− 1-phenylethanol and (R)/(S)− 2-butanol.
Permanent Link: https://hdl.handle.net/11104/0345237