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Unprecedented light induced aggregation of cationic 1,4,5,8-Naphthalenediimide amphiphiles [dataset] Open Access

Bola amphiphiles from naphthalenediimide (NDI-bas) with quaternary ammonium groups (DC4, DaP, and DaO) display association in solution, as well as, surprisingly, visible light promoted photochromism in concentrated solutions of water, acetonitrile and THF. The photochromism is correlated with an aggregation process that leads to a significant modification of the electronic transitions, resulting in an unusual absorption band distribution that points out to a type of H-aggregation in transverse. This assembly can be reversibly broken up by heating at 70 °C and adding bulk salt (NaBF4). By 1H-NMR spectroscopic analysis of the irradiation/heating cycle the assembly/disassembly process can be followed by the changes in peak width and intensity. These photoinduced aggregates can sensitize dissolved O2 to give singlet oxygen, a surprising observation when it comes to sensitization efficiency for dyes where aggregation usually decreases the sensitization yield. Laser-induced luminescence measurements corroborate the existence of triplet states as phosphorescence was detected, being particularly intense in concentrated THF solutions.

Descriptions

Resource type

Dataset

Contributors

Contact person: Steed, Jonathan ¹
Creator: Triboni, Eduardo R. ²
Data collector: Triboni, Eduardo R. ²

¹ Durham University, UK
² Universidade de São Paulo, Brazil

Funder

Fundação de Amparo à Pesquisa do Estado de São Paulo
Engineering and Physical Sciences Research Council
Conselho Nacional de Desenvolvimento Científico e Tecnológico
PRP-USP
Fundação para a Ciência e a Tecnologia

Research methods

NMR spectroscopy, UV-Vis spectroscopy

Other description

Keyword

Twisted H-type aggregate
Type-II sensitizer
Stimuli responsive
UV-light induced aggregation

Subject

Location

Language

Cited in

Identifier

ark:/32150/r1c534fp00n
doi:10.15128/r1c534fp00n

Rights

Creative Commons Attribution 4.0 International (CC BY)

Publisher

Durham University

Date Created

File Details

Depositor

J.W. Steed

Date Uploaded

26 February 2024, 11:02:58

Date Modified

8 March 2024, 14:03:34

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Characterization

File format: zip (ZIP Format)

Mime type: application/zip

File size: 19487728

Last modified: 2024:03:08 12:19:26+00:00

Filename: Unprecedented light induced aggregation.zip

Original checksum: d95876cbf40b2c11f8a375dc8e44c367