Fast electronic relaxation in lathanide porphyrins

Цвирко, М. П.; Stelmakh, G. F.; Pyatosin, V. E.; Solovyov, K. N.; Kachura, T. F.; Piskarskas, A.; Gadonas, R.

doi:10.1016/0301-0104(86)87114-2

Cited by 44 publications

(24 citation statements)

References 8 publications

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“…One area of interest involves systems where optical signatures that interrogate the metal center directly are weak. In this context, we can point to emissive lanthanide ion species whose photophysics can be exploited in sensing, lighting, and laser technologies [54][55][56][57][58]. Within such systems, phosphorescence involves radially contracted 4f-electron metal-centered states.…”

Section: Impacted Areas Of Sciencementioning

confidence: 99%

Ultrafast Time-Resolved Hard X-Ray Emission Spectroscopy on a Tabletop

et al. 2016

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Experimental tools capable of monitoring both atomic and electronic structure on ultrafast (femtosecond to picosecond) time scales are needed for investigating photophysical processes fundamental to light harvesting, photocatalysis, energy and data storage, and optical display technologies. Time-resolved hard x-ray (>3 keV) spectroscopies have proven valuable for these measurements due to their elemental specificity and sensitivity to geometric and electronic structures. Here, we present the first tabletop apparatus capable of performing time-resolved x-ray emission spectroscopy. The time resolution of the apparatus is better than 6 ps. By combining a compact laser-driven plasma source with a highly efficient array of microcalorimeter x-ray detectors, we are able to observe photoinduced spin changes in an archetypal polypyridyl iron complex ½Feð2; 2 0 -bipyridineÞ 3 2þ and accurately measure the lifetime of the quintet spin state. Our results demonstrate that ultrafast hard x-ray emission spectroscopy is no longer confined to large facilities and now can be performed in conventional laboratories with 10 times better time resolution than at synchrotrons. Our results are enabled, in part, by a 100-to 1000-fold increase in x-ray collection efficiency compared to current techniques.

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Section: Impacted Areas Of Sciencementioning

confidence: 99%

Ultrafast Time-Resolved Hard X-Ray Emission Spectroscopy on a Tabletop

et al. 2016

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“…The lifetimes of luminescence (t) were determined by the least-squares method. The relative quantum yields of 4f-luminescence (f) for the ytterbium complexes were calculated using Zn-tetraphenylporphyrin as a standard, the quantum yield of which is 0.0315 [13].…”

Section: Instrumentationmentioning

confidence: 99%

Spectral-luminescent effects in heterometallic complexes of crown-porphyrins

Korovin

Жиліна

Русакова

et al. 2001

J. Porphyrins Phthalocyanines

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New complexes of ytterbium with porphyrins containing crown-and other oxygen-containing cyclic substituents were obtained. The absorption, excitation, ligand luminescence and 4f-luminescence spectra have been investigated. It has been shown that 4f-luminescence of ytterbium Yb(III) ions was a result of the intramolecular energy transfer from the triplet level of the ligands to the resonance 2 F 5/2 level of Yb(III). It has been also established that in presence of alkali metal Na, K and Cs the dimer complexes (sandwich-type) of ytterbium-crown-porphyrin were formed. Molecular luminescence of the porphyrin matrix was quenched completely in these dimers, but at the same time the quantum yield and lifetime of 4f-luminescence increase in the complexes.

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“…2). However, with respect to the summarized fluorescence properties (see Table 1 [5,9,29], the Q(0,0) fluorescence band of Lu(III) porphyrins should be slightly more intensive than that of Gd(III) porphyrins with respect to their Q(0,1) fluorescence bands. Therefore, one can expect that the Q(0,0) fluorescence band of Lu(III) porphyrins provides a majority of the overall S 1 →S 0 fluorescence intensity (however, from the studied species, this regularity concerns TBP and EP complexes only [1]).…”

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confidence: 97%

“…It facilitates a clear registration of fluorescence due to occurrence of relatively intensive bands. Secondly, according to the intensity ratio of Q(0,0) and Q(0,1) fluorescence bands of lanthanide TBP complexes[9,29], the Q(0,0) fluorescence band provides a majority of the overall S 1 →S 0 fluorescence intensity. Thirdly, fluorescence of metalloporphyrins based on TBP ligand is the least disturbed by fluorescence of free-base porphyrins(Fig.…”

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confidence: 99%