Please use this identifier to cite or link to this item: http://localhost:8080/xmlui/handle/123456789/3878
Title: Self-Assembly and Photochemistry of a Pyrene-Methyl Viologen Supramolecular Fiber System
Authors: Jeevan, A K
Gopidas, K R
Keywords: self organization
vesicles
nanostructures
absorption
lasers
Issue Date: 5-Aug-2021
Publisher: American Chemical Society
Citation: The Journal of Physical Chemistry B; 125(30):8539-8549
Abstract: This paper reports the self-assembly of a donor–acceptor system into nanoscopic structures and the photo processes taking place within these structures. The donor employed is pyrene linked to two β-cyclodextrin molecules (CD-PY-CD), and adamantane-linked methyl viologen attached to the three arms of mesitylene (Ms-(MV2+-AD)3) is the acceptor. CD-PY-CD and Ms-(MV2+-AD)3 when dissolved in water self-assembled into vesicles, which joined together to give long fibers. The self-assembly was studied using spectroscopic and microscopic techniques. Fluorescence of the pyrene chromophore was quenched within the self-assembled system due to efficient photoinduced electron transfer to methyl viologen. Photoinduced electron transfer within the assembly is confirmed through identification of product radical ions in flash photolysis experiments. Steady-state irradiation of the self-assembled system in an optical bench led to the formation of methyl viologen radical cation, which was stable for a few hours. Longevity of the radical cation was attributed to the fast reaction of pyrene radical cation with adjacent pyrene to give an unstable adduct, which slows down the back electron transfer process.
URI: https://pubs.acs.org/doi/full/10.1021/acs.jpcb.1c04417
http://hdl.handle.net/123456789/3878
Appears in Collections:2021

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