Intramolecular Energy Transfer in a Series of Star-Shaped Molecules with a Central Porphyrin Core and Four Oligocarbazole Arms

Huo, Dayujia; Qin, Peng; Xu, Tinghua; Wang, Xian; Xia, Andong; Lu, Ran; Cui, Ganglong; Yan, Wei

doi:10.1021/acs.jpcc.0c08451

Cited by 3 publications

(1 citation statement)

References 75 publications

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“…The femtosecond transient absorption spectra were measured at ∼150 fs time-resolution using a commercial femtosecond broadband pump−probe setup (Harpia-TA, Light Conversion) 57 with an amplified femtosecond Ti:sapphire laser (Coherent Astrella, 7 mJ, 40 fs, 800 nm, 1 kHz). The pumping wavelengths were generated by an optical parametric amplifier (TOPAS-C, Coherent), and the probe pulses were obtained with a CaF2 plate (2 mm thick).…”

Section: Methodsmentioning

confidence: 99%

Atomic structure of a seed-sized gold nanoprism

Song

Zhou

et al. 2022

Nat Commun

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The growth of nanoparticles along one or two directions leads to anisotropic nanoparticles, but the nucleation (i.e., the formation of small seeds of specific shape) has long been elusive. Here, we show the total structure of a seed-sized Au56 nanoprism, in which the side Au{100} facets are surrounded by bridging thiolates, whereas the top/bottom {111} facets are capped by phosphine ligands at the corners and Br− at the center. The bromide has been proved to be the key to effectively stabilize the Au{111} to fulfill a complete face-centered-cubic core. In femtosecond electron dynamics analysis, the non-evolution of transient absorption spectra of Au56 is similar to that of larger-sized gold nanoclusters (n > 100), which is ascribed to the completeness of the prismatic Au56 core and an effective electron relaxation pathway created by the stronger Au-Au bonds inside. This work provides some insights for the understanding of plasmonic nanoprism formation.

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Section: Methodsmentioning

confidence: 99%

Atomic structure of a seed-sized gold nanoprism

Song

Zhou

et al. 2022

Nat Commun

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Photoinduced Electron Transfer Reactions of Water Soluble Porphyrins in Zeolite Environment

2021

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Excited state interactions of zeolite adsorbed porphyrins have been investigated by steady state luminescence quenching technique with certain antioxidants such as reduced glutathione, ascorbic acid and L-cysteine. The zeolite supported porphyrins, meso-tetra (N-methyl-4-pyridyl) porphyrin (H2TMPyP 4+ ) and zinc tetra(N-methyl-4-pyridyl) porphyrin (ZnTMPyP 4+ ) was prepared and characterized by various techniques such as Diffuse Reflectance Spectra (DRS), Scanning Electron Microscope (SEM), powder X-Ray Diffraction (XRD) and BET surface area. The interaction of zeolites with porphyrins are shown to increase the lifetime of the singlet excited state of porphyrins and decays are biphasic in nature. The splitting of the emission band of porphyrins occurs in 1:1 glycerol: water solution due to the changes in the dielectric of the solvation sphere associated with porphyrin. The Stern-Volmer plots of I0/I vs quencher total concentration [Q] were linear in the whole range of [Q] used. This study revealed effective quenching for zinc porphyrin compared to free base porphyrin. The effect of quenchers and zeolite acidity has also been studied. Quenching rate constant (kq) is on the order of 10 9 M −1 s −1 . The quenching reaction obeys Rehm-Weller Equation and is shown to be due to thermodynamically favoured electron transfer from quenchers to the excited singlet state of porphyrins (reductive quenching).

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Plasmon induced heat funneling from Au to Cu in the bimetallic Au@Cu core-shell nanoparticles

Shi,

Yang,

et al. 2024

Chinese Journal of Chemical Physics

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The bimetallic nanostructures that mix a plasmonic metal with a transition metal in the form of the core-shell nanoparticles are promising to promote catalytic performance. But it is still unclear how the heat (hot electrons and phonons) transfers on the interface between two metals. We have designed and synthesized Au@Cu bimetallic nanoparticles with Au as core and Cu as shell. By using transient absorption spectroscopy, we find that there are two plasmon induced heat funneling processes from Au core to Cu shell. One is the electron temperature equilibrium (electron heat transfer) with equilibration time of ~560 fs. The other is the lattice temperature equilibrium (lattice heat transfer) with equilibration time of ~13 ps. This plasmon induced heat funneling may be universal in similar bimetallic nanostructures, so our finding could contribute to further understanding the catalytic mechanism of bimetallic plasmonic photothermal catalysis.

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Intramolecular Energy Transfer in a Series of Star-Shaped Molecules with a Central Porphyrin Core and Four Oligocarbazole Arms

Cited by 3 publications

References 75 publications

Atomic structure of a seed-sized gold nanoprism

Atomic structure of a seed-sized gold nanoprism

Photoinduced Electron Transfer Reactions of Water Soluble Porphyrins in Zeolite Environment

Plasmon induced heat funneling from Au to Cu in the bimetallic Au@Cu core-shell nanoparticles

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