Journal Article

PUBDB-2023-05256

http://join2-wiki.gsi.de/foswiki/pub/Main/Artwork/join2_logo100x88.png Evolution of the ionisation energy with the stepwise growth of the chiral clusters of [4]helicene

Rosa Domingos, S. M. (Corresponding author)Extern*DESY* ; Tikhonov, D. (Corresponding author)DESY* ; Steber, A. (Corresponding author)CFEL*MPG*DESY* ; Eschenbach, P. ; Gruet, S. P.DESY* ; Hrodmarsson, H. R. ; Martin, K. ; Garcia, G. A. ; Nahon, L.Extern* ; Neugebauer, J. ; Avarvari, N. ; Schnell, M. (Corresponding author)DESY*

2024
Nature Publishing Group UK [London]

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Please use a persistent id in citations: doi:10.1038/s41467-024-48778-0  doi:10.3204/PUBDB-2023-05256

Abstract: We report on photoelectron-photoion coincidence (PEPICO) spectroscopy experiments on [4]helicene performed with a vacuum ultraviolet synchrotron beamline. Aggregates (up to the heptamer) of [4]helicene, the smallest polycyclic aromatic hydrocarbon with helical chirality, were produced and investigated with a combined experimental and theoretical approach using several state-of-the-art quantum-chemical methodologies. The ionisation onsets are extracted for each cluster size from the mass-selected photoelectron spectra and compared with calculations of vertical ionisation energies. We explore the complex aggregation topologies emerging from the multitude of isomers formed through clustering of P and M, the two enantiomers of [4]helicene.The very satisfactory benchmarking between experimental ionisation onsets vs. predicted ionisation energies allows the identification of theoretically predicted potential aggregation motifs and corresponding energetic ordering of chiral clusters. Our structural models suggest that a homochiral aggregation route is energetically favoured over heterochiral arrangements with increasing cluster size, hinting at potential symmetry breaking in PAH cluster formation at the scale of small grains.

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Contributing Institute(s):

1. Spectroscopy of molecular processes (FS-SMP)

Research Program(s):

1. 631 - Matter – Dynamics, Mechanisms and Control (POF4-631) (POF4-631)
2. DFG project G:(GEPRIS)328961117 - SFB 1319: Extremes Licht zur Analyse und Kontrolle molekularer Chiralität (ELCH) (328961117) (328961117)
3. GRK 2678 - GRK 2678: Funktionelle pi-Systeme: Aktivierung, Wechselwirkungen und Anwendungen (pi-Sys) (437785492) (437785492)

Experiment(s):

1. No specific instrument

Appears in the scientific report 2024

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