The influence of molecular geometry on photophysical properties and self-assembly of phthalimide end-capped thiophene-based organic molecules

Eftaiha, Ala’a F.; Hendsbee, Arthur D.; Sun, Jon‐Paul; Hill, Ian G.

doi:10.1016/j.matlet.2015.05.136

Cited by 3 publications

(1 citation statement)

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“…Indeed, the molecular geometry and electronic configurations of chromophores can have significant implications toward their observed photophysical properties. [154][155][156] It is therefore reasonable to assume that if a particular conformation of a given fluorophore has an exceptionally high energy in its ground state relative to other ground state conformations of the same fluorophore, the high energy conformation theoretically would make up a small proportion of the overall population of fluorophore molecules. In turn, the fluorophores in the high energy conformation would be expected to contribute minimally toward the overall fluorescence observed.…”

Section: Density Functional Theory Investigation Of 7 Andmentioning

confidence: 99%

A Comprehensive Investigation Into How Metal Nanoparticles Enhance Photochemical Processes

Dogantzis

2024

Preprint

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<p>Integrated nanoparticle-fluorophore systems are an emerging class of hybrid materials with potential for a variety of applications. Within these systems, Metal-Enhanced Fluorescence (MEF) is a phenomenon that arises through the unique near-field interactions between organic fluorophores and metallic nanoparticles. These interactions can enhance fluorophore brightness by operating under two mechanistic pathways: increased fluorophore excitation, and increased fluorophore emission. It is critical, however, to garner an understanding of the balance between the two mechanisms in order to optimize its use for customized applications. In this work, silver nanoplates (AgNP) were synergistically integrated with a photoactivatable system consisting of a fluorogenic boron dipyrromethene (BODIPY) and select photoacid generators (PAGs). Light irradiation of the PAGs promotes the release of acid, which encourages the formation of a fluorescent BODIPY analogue. AgNP were found to enhance the output of steady-state emission via MEF. Furthermore, single molecule total internal reflection fluorescence microscopy (TIRFM) was executed to distinguish the relative contributions of the two MEF mechanisms between the quenched and fluorescent BODIPY fluorochromes and AgNP. Interestingly, increased excitation was the dominant MEF mechanism amongst both dyes. Finally, the rational design of a ‘uninanomolecular’ superstructure incorporating both a photoactivatable dihydrofluorescein dye and AgNP within a single system was investigated. Two synthetic approaches were proposed, however neither method yielded superstructures that photoactivated with subsequent MEF. Overall, this work aids to advance the understanding of complex particle-molecule interactions.</p>

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Section: Density Functional Theory Investigation Of 7 Andmentioning

confidence: 99%