Azadioxatriangulenium and diazaoxatriangulenium: quantum yields and fundamental photophysical properties

Publikation: Bidrag til tidsskriftTidsskriftartikelForskningfagfællebedømt

Dokumenter

Sidsel Ammitzbøll Bogh, Mats Simmermacher, Michael Westberg, Mikkel Bregnhøj, Martin Rosenberg, Luca De Vico, Manoel Veiga, Bo Wegge Laursen, Peter R. Ogilby, Stephan P. A. Sauer, Thomas Just Sørensen

Over the last decade, we have investigated and exploited the photophysical properties of triangulenium dyes. Azadioxatriangulenium (ADOTA) and diazaoxatriangulenium (DAOTA), in particular, have features that make them useful in various fluorescence-based technologies (e.g., bioimaging). Through our work with ADOTA and DAOTA, we became aware that the reported fluorescence quantum yields (ϕfl) for these dyes are lower than their actual values. We thus set out to further investigate the fundamental structure–property relationships in these unique conjugated cationic systems. The nonradiative processes in the systems were explored using transient absorption spectroscopy and time-resolved emission spectroscopy in combination with computational chemistry. The influence of molecular oxygen on the fluorescence properties was explored, and the singlet oxygen sensitization efficiencies of ADOTA and DAOTA were determined. We conclude that, for these dyes, the amount of nonradiative deactivation of the first excited singlet state (S1) of the azaoxa-triangulenium fluorophores is low, that the rate of such deactivation is slower than what is observed in common cationic dyes, that there are no observable radiative transitions occurring from the first excited triplet state (T1) of these dyes, and that the efficiency of sensitized singlet oxygen production is low (ϕΔ ≤ 10%). These photophysical results provide a solid base upon which technological applications of these fluorescent dyes can be built.
OriginalsprogEngelsk
TidsskriftACS Omega
Vol/bind2
Tidsskriftsnummer1
Sider (fra-til)193-203
Antal sider11
ISSN2470-1343
DOI
StatusUdgivet - 2017

Antal downloads er baseret på statistik fra Google Scholar og www.ku.dk


Ingen data tilgængelig

ID: 173435903