Freiburg 2024 – wissenschaftliches Programm
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MO: Fachverband Molekülphysik
MO 18: Poster: Cluster
MO 18.9: Poster
Mittwoch, 13. März 2024, 17:00–19:00, Tent C
Time-resolved laser photodissociation investigation of a cationic Iridium(III) complex in an ion trap — •Philipp Weber1, Marcel J. P. Schmitt1, Christoph Riehn1, and Christoph Lambert2 — 1Department of Chemistry, RPTU Kaiserslautern — 2Institute for Organic Chemistry, Universität Würzburg
Iridium complexes are well known for their exceptional photophysical properties, which lead to their application in the fields of OLEDs and photovoltaics. [1] Transient laser photodissociation experiments were conducted on an isolated Ir(III) complex in the ion trap of an electrospray ionization mass spectrometer, giving dynamics on time scales from sub-ps to µs. We present preliminary results for intrinsic gas phase dynamics of an Iridium(III) two donor- one acceptor (D2-A) system based on a substituted triarylamine as electron donor (D, ppz-TAA) and tetramethyl-phenanthroline (A, tmp) as electron acceptor, which showed a long-lived (tens of ns) non-fluorescing charge-separated state in solution. [2] We observed, both, fragmentation and photoionization (generating the dication) upon photoexcitation, with the latter dominating the signal for pump-probe investigations. The observed dynamics (∼0.2 ps, ∼9 µs) point more towards the fast formation of a long-lived triplet electronic state rather than a charge-separated state, with the latter possibly destabilized with respect to solution. We discuss different scenarios of electronic state dynamics for gas phase and solution.
[1] Longhi; De Cola. Iridium(III) Complexes for OLED Application. John Wiley & Sons, 2017. [2] Chem. Commun., 2009, 1670-1672.
Keywords: electrospray ionization mass spectrometry; action spectroscopy; femtosecond dynamics; photodissociation; laser spectroscopy