On the photophysics of nanographenes-investigation of functionalized hexa-: Peri -hexabenzocoronenes as model systems

Haines P, Reger D, Träg J, Strauss V, Lungerich D, Zahn D, Jux N, Guldi DM (2021)

Publication Type: Journal article

Publication year: 2021

Journal

Book Volume: 13

Pages Range: 801-809

Journal Issue: 2

DOI: 10.1039/d0nr06802k

Abstract

In this study, we report on hexa-peri-hexabenzocoronenes (HBCs) as representative models for nanographenes. To this end, we synthesized a family of functionalized HBCs and investigated the impact of the substituents on the π-extended systems of the HBCs. DFT and TD-DFT calculations suggested a charge transfer character, which intensified as the electron density withdrawing effects of the substituents (-M-effect) increased. Unambiguous corroboration of the charge transfer character in the case of NO2-substituents was realized via steady-state absorption and fluorescence experiments, which focused on the dependencies on the solvent polarity and temperature featuring. Going beyond HBCs with NO2-substituents, time-correlated single photon counting, and femtosecond and nanosecond transient absorption spectroscopy unveiled long-lived singlet and triplet excited states. As a complement, we performed electrochemical and spectroelectrochemical measurements. These measurements were carried out to shed light onto the nature of the functionalized HBCs as electron acceptors and/or donors, on the one hand, and their corresponding spectroscopic signatures, on the other hand. All of the aforementioned information enabled intermolecular charge separation assays with, for example, suitable electron acceptors by steady-state and time-resolved spectroscopy. This journal is

Authors with CRIS profile

Involved external institutions

Max-Planck-Institut für Kolloid- und Grenzflächenforschung / Max Planck Institute of Colloids and Interfaces Germany (DE) Institute for Basic Science Korea, Republic of (KR)

How to cite

APA:

Haines, P., Reger, D., Träg, J., Strauss, V., Lungerich, D., Zahn, D.,... Guldi, D.M. (2021). On the photophysics of nanographenes-investigation of functionalized hexa-: Peri -hexabenzocoronenes as model systems. Nanoscale, 13(2), 801-809. https://dx.doi.org/10.1039/d0nr06802k

MLA:

Haines, Philipp, et al. "On the photophysics of nanographenes-investigation of functionalized hexa-: Peri -hexabenzocoronenes as model systems." Nanoscale 13.2 (2021): 801-809.

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