Preparation of amino-substituted anthraquinone: study of the intersystem crossing and application as efficient photoinitiators for photopolymerization

Wang, Shengping; Cao, Huaiman; Zhao, Jianzhang; Yu, Fabiao

doi:10.1039/d3nj01330h

New J. Chem.

2023

DOI: 10.1039/d3nj01330h

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Preparation of amino-substituted anthraquinone: study of the intersystem crossing and application as efficient photoinitiators for photopolymerization

Shengping Wang

Huaiman Cao

Jianzhang Zhao

et al.

Abstract: We prepared a series of amino-substituted 9,10-anthraquinone (AQ) derivatives to study the photophysical property, especially the intersystem crossing (ISC) efficiency and the triplet excited states. Monoamino substituted AQ derivatives show...

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Electron Spin Dynamics of the Intersystem Crossing in Aminoanthraquinone Derivatives: The Spectral Telltale of Short Triplet Excited States

Wang,

Sukhanov,

et al. 2024

J. Phys. Chem. B

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We studied the excited state dynamics of two bisamino substituted anthraquinone (AQ) derivatives, with absorption in the visible spectral region, which results from the attachment of a electron-donating group to the electron-deficient AQ chromophore. Femtosecond transient absorption spectra show that intersystem crossing (ISC) takes place in 190−320 ps, and nanosecond transient absorption spectra demonstrated an unusually short triplet state lifetime (2.06−5.43 μs) for the two AQ derivatives. Pulsed laser-excited time-resolved electron paramagnetic resonance (TREPR) spectra show an inversion of the electron spin polarization (ESP) phase pattern of the triplet state at a longer delay time after laser flash. Spectral simulations show faster decay of the T y sublevel than the other two sublevels (τ x = 15.0 μs, τ y = 1.50 μs, τ z = 15.0 μs); theoretical computation predicts initial overpopulation of the T y sublevel, and rationalizes the short T 1 state lifetime and the ESP inversion. Theoretical computations taking into account the electron-vibrational coupling, i.e., the Herzberg−Teller effect, successfully rationalize the TREPR experimental observations.

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Electron Spin Dynamics of the Intersystem Crossing in Aminoanthraquinone Derivatives: The Spectral Telltale of Short Triplet Excited States

Wang,

Sukhanov,

et al. 2024

J. Phys. Chem. B

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show abstract

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Preparation of amino-substituted anthraquinone: study of the intersystem crossing and application as efficient photoinitiators for photopolymerization

Abstract: We prepared a series of amino-substituted 9,10-anthraquinone (AQ) derivatives to study the photophysical property, especially the intersystem crossing (ISC) efficiency and the triplet excited states. Monoamino substituted AQ derivatives show...

Cited by 1 publication

References 44 publications

Electron Spin Dynamics of the Intersystem Crossing in Aminoanthraquinone Derivatives: The Spectral Telltale of Short Triplet Excited States

Electron Spin Dynamics of the Intersystem Crossing in Aminoanthraquinone Derivatives: The Spectral Telltale of Short Triplet Excited States

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