Photophysical Characterization and Excited State Dynamics of Decamethylruthenocenium

The Journal of Physical Chemistry A, Год журнала: 2025, Номер unknown

Опубликована: Фев. 4, 2025

Understanding the landscape of molecular photocatalysis is vital to enable efficient conversion feedstock molecules targeted products and inhibit off-cycle reactivity. In this study, light-promoted reactivity [RuCp*2]+ was explored via electronic structure, photophysical, photostability studies within a photocatalytic hydrogen evolution cycle assessed. TD-DFT calculations support assignment low-energy ligand-to-metal charge transfer transition (LMCT) centered at 500 nm, where an electron from ligand-based orbital delocalized across both Cp* ligands promoted dx2-y2-based β-LUMO orbital. Upon irradiating LMCT absorption feature, ultrafast transient spectroscopy measurements show that initial excited state (τ1 = 1.3 ± 0.1 ps) populated, which undergoes fast relaxation longer-lived (τ2 12.0 0.9 ps), either internal or vibrational relaxation. Despite short-lived nature these states, bulk photolysis demonstrates photochemical decomposition possible upon prolonged illumination. Collectively, reveal light-driven decomposition, highlighting necessity construct systems resistant in ground states.

Язык: Английский

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Synthesis of 3‐Hydroxyfluorenones Based on the Cascade Reaction of Aryl Enaminones with Benzyl Substituted Cyclopropanols

Chinese Journal of Chemistry, Год журнала: 2025, Номер unknown

Опубликована: Июнь 4, 2025

Comprehensive Summary Presented herein is a novel synthesis of 3‐hydroxyfluorenones through the cascade reaction aryl enaminones with benzyl substituted cyclopropanols. The formation product initiated by introduction an enone moiety onto enaminone cyclopropanol as homoenolate precursor C−H bond activation, followed intramolecular enamine Michael addition, enol amine elimination and aromatization‐driven oxidative dehydrogenation. To our knowledge, this should be first example for specific 3‐hydroxyfluorenone derivatives via simultaneous both indenone phenol scaffolds C−H/C−C/C−N activation three C−C formation. In general, newly developed protocol features easily accessible substrates, synthetically pharmaceutically valuable products, unique pathway, good compatibility various functional groups ready scalability.

Язык: Английский

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Sequential C–H Aroylation and Formal [4 + 2] Cycloaddition of Naphthalenes with Aroylfluorides and Styrenes

ACS Catalysis, Год журнала: 2025, Номер unknown, С. 10406 - 10415

Опубликована: Июнь 4, 2025

Язык: Английский

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Electron Donor-Acceptor Complex Enabled Photocascade Strategy for Synthesis of trans-Dihydrofuro[3,2-c]chromen-4-one Scaffolds via Radical Conjugate Addition of Pyridinium Ylide

Chemical Communications, Год журнала: 2024, Номер unknown

Опубликована: Янв. 1, 2024

A photocascade strategy is disclosed for the synthesis of trans -dihydrofurocoumarin utilising EDA complex followed by 1,4-radical conjugate addition pyridinium ylide.

Язык: Английский

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