Impact of isoelectronic substitution on the excited state processes in polycyclic aromatic hydrocarbons: a joint experimental and theoretical study of 4<i>a</i>,8<i>a</i>-azaboranaphthalene

Sturm, Floriane; Bühler, Michael; Stapper, Christoph; Schneider, Johannes S.; Helten, Holger; Fischer, Ingo; Röhr, Merle I. S.

doi:10.1039/d3cp05508f

Phys. Chem. Chem. Phys.

2024

DOI: 10.1039/d3cp05508f

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Impact of isoelectronic substitution on the excited state processes in polycyclic aromatic hydrocarbons: a joint experimental and theoretical study of 4a,8a-azaboranaphthalene

Floriane Sturm,

Michael Bühler,

Christoph Stapper

et al.

Abstract: Substituting CC by the isoelectronic BN units is a promising approach to modify the optoelectronic properties of polycyclic aromatic hydrocarbons. While computational studies have already addressed trends in the electronic...

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Non-Radiative Deactivation in Isolated Quinoline

Sturm,

Herok,

Fischer

2024

J. Phys. Chem. A

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The photophysics of the S 2 1 (ππ*) state of the polycyclic aromatic nitrogencontaining hydrocarbon (PANH) quinoline is investigated in a free jet using a picosecond laser system. A [1 + 1] multiphoton ionization spectrum yields the S 2 origin at around 32 200 cm −1 and reveals several vibronic bands. In time-resolved experiments, quinoline is then excited between 312.2 and 279.7 nm. Probe wavelengths of 351 and 263.5 nm are employed. The dynamics is monitored by time-resolved photoelectron imaging. The images reveal a shortlived band at high electron kinetic energies with a ps lifetime and a band at lower electron kinetic energies that shows an offset at long delay times. In comparison with previous work, the offset is assigned to ionization from the T 1 state. Lifetimes decrease from 45 ps at the S 2 origin to 11 ps at +3550 cm −1 . Most likely, the S 2 1 (ππ*) state deactivates by internal conversion to the S 1 1 (nπ*) state, followed by intersystem crossing to the triplet manifold.

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Non-Radiative Deactivation in Isolated Quinoline

Sturm,

Herok,

Fischer

2024

J. Phys. Chem. A

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Impact of isoelectronic substitution on the excited state processes in polycyclic aromatic hydrocarbons: a joint experimental and theoretical study of 4a,8a-azaboranaphthalene

Abstract: Substituting CC by the isoelectronic BN units is a promising approach to modify the optoelectronic properties of polycyclic aromatic hydrocarbons. While computational studies have already addressed trends in the electronic...

Cited by 1 publication

References 64 publications

Non-Radiative Deactivation in Isolated Quinoline

Non-Radiative Deactivation in Isolated Quinoline

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