Issue 36, 2019

Enhancing the intermolecular singlet fission efficiency by controlling the self-assembly of amphipathic tetracene derivatives in aqueous solution

Abstract

Two kinds of nanoparticles of two tetracene derivatives with (PhTc-COOH) or without (PhTc) carboxylic groups are prepared with the re-precipitation method. Scanning electron microscopy and dynamic light scattering experiments reveal different morphologies and sizes of these two kinds of nanoparticles. Furthermore, a stronger intermolecular interaction is achieved in PhTc-COOH nanoparticles than in PhTc nanoparticles as revealed by their steady-state absorption spectra. This is most likely due to the more parallel and closer arrangement of the tetracene molecules in PhTc-COOH nanoparticles driven by the hydrophilic effect of the carboxyl group. Time-resolved fluorescence and ultrafast transient absorption spectra reveal that both PhTc-COOH and PhTc nanoparticles can conduct singlet fission (SF) upon photoexcitation. However, the SF in PhTc-COOH nanoparticles is much faster and more efficient than in PhTc nanoparticles. More importantly, SF mechanisms in these two nanoparticles are different. A charge-transfer (CT) state is identified as an intermediate for the SF in PhTc nanoparticles, while no CT state is detected in the SF process of PhTc-COOH nanoparticles. This work suggests that introduction of supramolecular interaction to tune the arrangement of tetracene molecules in nanoparticles is a useful strategy towards efficient SF. This conclusion might be also applied in other SF molecular systems.

Graphical abstract: Enhancing the intermolecular singlet fission efficiency by controlling the self-assembly of amphipathic tetracene derivatives in aqueous solution

Supplementary files

Article information

Article type
Communication
Submitted
26 jul 2019
Accepted
22 ago 2019
First published
22 ago 2019

J. Mater. Chem. C, 2019,7, 11090-11098

Enhancing the intermolecular singlet fission efficiency by controlling the self-assembly of amphipathic tetracene derivatives in aqueous solution

Z. Tang, S. Zhou, X. Wang, H. Liu, X. Yan, S. Liu, X. Lu and X. Li, J. Mater. Chem. C, 2019, 7, 11090 DOI: 10.1039/C9TC04070F

To request permission to reproduce material from this article, please go to the Copyright Clearance Center request page.

If you are an author contributing to an RSC publication, you do not need to request permission provided correct acknowledgement is given.

If you are the author of this article, you do not need to request permission to reproduce figures and diagrams provided correct acknowledgement is given. If you want to reproduce the whole article in a third-party publication (excluding your thesis/dissertation for which permission is not required) please go to the Copyright Clearance Center request page.

Read more about how to correctly acknowledge RSC content.

Social activity

Spotlight

Advertisements