Article detail · 2021
Chromophore Orientation-Dependent Photophysical Properties of Pyrene\u2013Naphthalimide Compact Electron Donor\u2013Acceptor Dyads: Electron Transfer and Intersystem Crossing
Journal
The Journal of Physical Chemistry BISSN 1520-6106
The ISSN points to another catalog journal; the name is from the YÖKSİS record.
- Year
- 2021
- Type
- article
Data source split
- YÖKSİS YÖKSİS article record
- YÖKSİS venue The Journal of Physical Chemistry B
- Catalog match (ISSN) Journal of Physical Chemistry B
- OpenAlex OpenAlex enrichment (abstract, citations, topics)
Abstract
OpenAlex · English
In order to study the effect of mutual orientation of the chromophores in compact electron donor–acceptor dyads on the spin-orbit charge transfer intersystem crossing (SOCT-ISC), we prepared naphthalimide ( NI )–pyrene ( Py ) compact electron donor–acceptor dyads, in which pyrene acts as an electron donor and NI is an electron acceptor. The connection of the two units is at the 4-C and 3-C positions of the NI unit and the 1-position of the pyrene moiety for dyads NI-Py-1 and NI-Py-2, respectively. A charge transfer absorption band was observed for both dyads in the UV–vis absorption spectra. Upon nanosecond pulsed laser excitation, long-lived triplet states (lifetime is 220 μs) were observed and the triplet state was confined to the pyrene moiety. The ISC efficiency is moderate to high in nonpolar to polar solvents (singlet oxygen quantum yield: Φ Δ = 14–52%). Ultrafast charge separation ( ca . 0.81 ps) and charge recombination-induced ISC (∼3.0 ns) were observed by femtosecond transient absorption spectroscopy. Time-resolved electron paramagnetic resonance spectroscopy confirms the SOCT-ISC mechanism; interestingly, the observed electron spin polarization pattern of the triplet state is chromophore orientation-dependent; and the population rates of the triplet sublevels of NI-Py-1 ( P x: P y: P z = 0.2:0.8:0) are drastically different from those of NI-Py-2 ( P x: P y: P z = 0:0:1).
Topics
Citations
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47 citations
OpenAlex cited_by_count (cache / database)
10 publications in the local catalog that cite this work (OpenAlex reference match; not the full global list).
- Efficient Spin–Orbit Charge‐Transfer Intersystem Crossing and Slow Intramolecular Triplet–Triplet Energy Transfer in Bodipy–Perylenebisimide Compact Dyads and Triads 2023
- Two-photon absorption and triplet excited state quenching of near-IR region aza-BODIPY photosensitizers via a triphenylamine moiety despite heavy bromine atoms 2022
- Two-photon absorption and triplet excited state quenching of near-IR region aza-BODIPY photosensitizers via a triphenylamine moiety despite heavy bromine atoms 2022
- Two-photon absorption and triplet excited state quenching of near-IR region aza-BODIPY photosensitizers via a triphenylamine moiety despite heavy bromine atoms 2022
- Two-photon absorption and triplet excited state quenching of near-IR region aza-BODIPY photosensitizers via a triphenylamine moiety despite heavy bromine atoms 2022
- Two-photon absorption and triplet excited state quenching of near-IR region aza-BODIPY photosensitizers via a triphenylamine moiety despite heavy bromine atoms 2022
- Two-photon absorption and triplet excited state quenching of near-IR region aza-BODIPY photosensitizers via a triphenylamine moiety despite heavy bromine atoms 2022
- The effect of thionation of the carbonyl group on the photophysics of compact spiro rhodamine-naphthalimide electron donor–acceptor dyads: intersystem crossing, charge separation, and electron spin dynamics 2023
- The effect of thionation of the carbonyl group on the photophysics of compact spiro rhodamine-naphthalimide electron donor–acceptor dyads: intersystem crossing, charge separation, and electron spin dynamics 2023
- Microenvironment-controlled switchable intersystem crossing in organic dyes: insights from ultrafast transient optical spectroscopy and theoretical calculations 2026