Formation of intersystem crossing transitions in Pd(II) and Pt(II) porphyrins: Nonplanar distortions of the macrocycle and charge transfer states

Knyukshto, V. N.; Шульга, А. М.; Sagun, E. I.; Zenkevich, É. I.

doi:10.1134/s0030400x06040163

Cited by 26 publications

(30 citation statements)

References 29 publications

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“…The quenching of the fluorescence of halogenated porphyrins and metalloporphyrins has been the subject of several studies [1][2][3][4]. It was established that there is a significant increase in the intersystem crossing rate constant due to the heavy-atom effects, which is consistent with the research of other series of compounds [5][6][7][8].…”

Section: Introductionsupporting

confidence: 58%

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Fluorescence properties of halogenated mono-hydroxyl corroles: the heavy-atom effects

Shi

Liu

Han

et al. 2009

J. Porphyrins Phthalocyanines

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A series of mono-hydroxyl corrole bearing a fluorine (1), chlorine (2), bromine (3) and iodine (4) atom on its 10-phenyl group have been synthesized. Fluorescence spectroscopy shows that the halogen atom at meso-phenyl group of corroles exhibit significant heavy-atom effect on their photo physical properties. Fluorescence quantum yields and the lifetime of these corroles decrease with the increasing of the atomic weight of halogen atoms. The quenching of the fluorescence could be interpreted in terms of a heavy atom-induced increase in intersystem crossing from S 1 to T 1 . The intersystem crossing rate constant of these corroles were also determined by transient fluorescence spectra.

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Section: Introductionsupporting

confidence: 58%

“…This shows these halogenated corroles exhibit a smaller fluorescence quantum yields than other triaryl corroles (Φ fl = 0.13-0.22) [26]. From Table 2, it can be seen that the fluorescence quantum yields (4). That is, with the increasing of atomic weight of the substituted halogen, the fluorescence quantum yield decreases significantly.…”

Section: Resultsmentioning

confidence: 81%

Fluorescence properties of halogenated mono-hydroxyl corroles: the heavy-atom effects

Shi

Liu

Han

et al. 2009

J. Porphyrins Phthalocyanines

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“…Unfortunately, the spectroscopic properties of nonsymmetrically functionalized porphyrins have only been sparsely investigated in the literature . The porphyrin‐monomer structure was, therefore, selected by inference from the energy levels of symmetrically functionalized porphyrins and those of meso‐phenyl‐octaethylporphyrin . To introduce a reactive group at the meso‐position, 4‐(2‐hydroxyethoxy)benzaldehyde was chosen.…”

Section: Resultsmentioning

confidence: 99%

Glassy poly(methacrylate) terpolymers with covalently attached emitters and sensitizers for low-power light upconversion

Lee

Thévenaz

Weder

et al. 2015

J. Polym. Sci. Part A: Polym. Chem.

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Low‐power light upconversion by triplet–triplet annihilation (TTA‐UC) was only recently demonstrated in glassy polymers and the upconversion efficiency in these materials is typically much lower than in solution. As aggregation of the chromophores was thought to be the culprit, we here report the covalent tethering of a suitable chromophore pair to a polymeric backbone. The new materials were based on the sensitizer‐bearing monomer palladium meso‐phenoxy‐tris(heptyl)porphyrin‐ethylmethacrylate (PdmPH3PMA), which was copolymerized with a diphenylanthrancene methacrylate (DPAMA), as the emitter‐bearing monomer, and methyl methacrylate (MMA) as an optically inert comonomer. The DPA content was kept within a narrow range of 30–37 wt %, while the PdmPH3PMA content was varied between 0.73 and 0.012 wt %. To explore additional compositions, blends of a high‐porphyrin‐content terpolymer with a DPAMA‐MMA copolymer were also prepared. All of the materials studied were processed into thin films by solution‐casting and displayed blue TTA‐UC emission. The UC emission intensity was found to strongly depend on the composition and the underlying effects were investigated through a systematic study. © 2015 Wiley Periodicals, Inc. J. Polym. Sci., Part A: Polym. Chem. 2015, 53, 1629–1639

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“…Regular (non-extended) PtP’s also possess S 0 →T 1 bands [13], but these are significantly blue-shifted relative to the 2PA maxima of dyes capable of FRET onto PtP’s.…”

Section: Resultsmentioning

confidence: 99%

Design of metalloporphyrin-based dendritic nanoprobes for two-photon microscopy of oxygen

Lebedev

Troxler

Vinogradov

2008

J. Porphyrins Phthalocyanines

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Metalloporphyrin-based phosphorescent nanoprobes are being developed for two-photon microscopy of oxygen. In these molecular constructs generation of porphyrin triplet states upon twophoton excitation is induced upon the intramolecular Förster-type resonance energy transfer from a covalently attached 2P antenna. In the earlier developed prototypes, electron transfer between the antenna and the metalloporphyrin strongly interfered with the phosphorescence, reducing the sensitivity and the dynamic range of the sensors. By tuning the distances between the antenna and the core and adjusting their redox potentials the unwanted electron transfer could be prevented. An array of phosphorescent Pt porphyrins (energy transfer acceptors) and 2P dyes (energy transfer donors) was screened using dynamic quenching of phosphorescence, and the FRET-pair with the minimal ET rate was identified. This pair, consisting of Coumarin-343 and Pt meso-tetra-(4-alkoxyphenyl)porphyrin, was used to construct a probe in which the antenna fragments were linked to the termini of G3 poly(arylglycine) (AG) dendrimer with PtP core. The folded dendrimer formed an insulating layer between the porphyrin and the antenna, simultaneously controlling the rate of oxygen quenching (Stern-Volmer oxygen quenching constant). Modification of the dendrimer periphery with oligoethyleneglycol residues made the probe's signal insensitive to the presence of proteins and other macromolecular solutes.

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Formation of intersystem crossing transitions in Pd(II) and Pt(II) porphyrins: Nonplanar distortions of the macrocycle and charge transfer states

Cited by 26 publications

References 29 publications

Fluorescence properties of halogenated mono-hydroxyl corroles: the heavy-atom effects

Fluorescence properties of halogenated mono-hydroxyl corroles: the heavy-atom effects

Glassy poly(methacrylate) terpolymers with covalently attached emitters and sensitizers for low-power light upconversion

Design of metalloporphyrin-based dendritic nanoprobes for two-photon microscopy of oxygen

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