Ultrafast Charge Separation Driven by Solvation-Coupled Intramolecular Torsion DOI
Yang Li, Lin Ma, Jiang‐Yang Shao

и другие.

The Journal of Physical Chemistry A, Год журнала: 2024, Номер 128(42), С. 9201 - 9207

Опубликована: Окт. 10, 2024

Photoinduced intramolecular charge separation in a pyrene- and triarylamine-based donor–acceptor dyad was studied by polarization-dependent femtosecond time-resolved transient absorption (TA) spectroscopy polar solvents. Photoexcitation forms an excited state with transfer (CT) character due to the intrinsic electronic coupling between triarylamine pyrene groups, resulting ultrafast (CS) TA measurements reveal correlation rate of CS solvation dynamics, which implies that is involved reaction. In addition, devoted tracking anisotropy evolution cationic band, attributed torsional motion proposed be coupled diffusive orientational solvent modes. The results therefore CT condensed phase driven solvation-coupled excited-state structural relaxation. other words, directly confirmed reaction coordinate strongly dyad.

Язык: Английский

A Review on Fluorescent Molecular Probes for Hg2+ Ion Detection: Mechanisms, Strategies, and Future Directions DOI
Rajib Pramanik

ChemistrySelect, Год журнала: 2025, Номер 10(7)

Опубликована: Фев. 1, 2025

Abstract Fluorescent molecular probes have gained significant attention due to their exceptional attributes, such as enhanced specificity, sensitivity, and reversibility. This review explores how organic probe molecules' fluorescence properties change when metal ions like Hg 2+ bind the receptors. The alteration in results from distinct photophysical mechanisms photoinduced electron transfer, proton energy charge excimer formation, aggregation‐induced emission, C═N isomerization etc. Besides, induce chemical reactions resulting changes structural conformation properties. As a result, this effect specifically affects signal of molecules, which is beneficial for advancing sensor technology developed detect contamination. Focusing on environmental pollution biological sample analysis, study highlights applying fluorescent techniques using chromophores heavy ions, particularly ions. Thus, dyes with modifiable functional groups ensure precise detection offering robust platform monitoring public health safety. We examine capacities, sensing mechanisms, limits, strategies, methodologies utilized. article provides insights into efficacy progress domain sensors detecting

Язык: Английский

Процитировано

3
Modulating the Charge Transfer Coupling in Boron-Dipyrromethene Homodimers by π-Bridge Units DOI
Li Ma, Zhuoran Kuang, Hao Zhang

и другие.

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

Опубликована: Март 19, 2025

To mimic the excitation energy conversion mechanisms observed in natural light-harvesting systems, we have extensively investigated photoinduced symmetry-breaking charge separations (SBCSs) various multichromophoric model systems been investigated. However, designing capable of simultaneously achieving ultrafast and complete SBCS remains a significant challenge. In this study, employed benzene, thiophene, furan as π-bridges to develop series boron dipyrromethene (BODIPY) homodimers. Spectral analysis, together with an estimation π-bridge-dependent transfer (CT) coupling using fragment difference method, reveals that π-bridge units different electron-donating abilities can effectively modulate CT between chromophores. Notably, furan-based π-bridge, exhibiting most pronounced character, facilitates (SBCT), i.e., excimer formation time constant about 12 ps weak polar toluene. Furthermore, dramatic increase rate was highly acetonitrile, improving from 60.4 for benzene-bridged homodimer 2.9 furan-bridged counterpart. These findings underscore potential tuning photophysical properties covalent molecular aggregates by optimizing such specific applications organic photovoltaics photocatalysis.

Язык: Английский

Процитировано

0
Facilitating Intrinsic Delayed Fluorescence of Conjugated Emitters by Inter-Chromophore Interaction DOI Creative Commons
Yixuan Gao,

Yingman Sun,

Zilong Guo

и другие.

Chemical Science, Год журнала: 2024, Номер unknown

Опубликована: Янв. 1, 2024

Delayed fluorescence (DF) is a unique emitting phenomenon of great interest for important applications in organic optoelectronics. In general, DF requires well-separated frontier orbitals, inherently corresponding to charge transfer (CT)-type emitters. However, facilitating intrinsic local excited (LE)-type conjugated emitters remains very challenging. Aiming overcome this obstacle, we demonstrate new molecular design strategy with DF-inactive B,N-multiple resonance (MR) emitter as model system. Without the necessity doping heavy atoms, synthesized co-facial dimer which an excimer-like state (S

Язык: Английский

Процитировано

2
Ultrafast Charge Separation Driven by Solvation-Coupled Intramolecular Torsion DOI
Yang Li, Lin Ma, Jiang‐Yang Shao

и другие.

The Journal of Physical Chemistry A, Год журнала: 2024, Номер 128(42), С. 9201 - 9207

Опубликована: Окт. 10, 2024

Photoinduced intramolecular charge separation in a pyrene- and triarylamine-based donor–acceptor dyad was studied by polarization-dependent femtosecond time-resolved transient absorption (TA) spectroscopy polar solvents. Photoexcitation forms an excited state with transfer (CT) character due to the intrinsic electronic coupling between triarylamine pyrene groups, resulting ultrafast (CS) TA measurements reveal correlation rate of CS solvation dynamics, which implies that is involved reaction. In addition, devoted tracking anisotropy evolution cationic band, attributed torsional motion proposed be coupled diffusive orientational solvent modes. The results therefore CT condensed phase driven solvation-coupled excited-state structural relaxation. other words, directly confirmed reaction coordinate strongly dyad.

Язык: Английский

Процитировано

1