One- and two-photon photochemical stability of linear and branched fluorene derivatives

Corredor, Claudia C.; Belfield, Kevin D.; Bondar, Mykhailo V.; Przhonska, Olga V.; Yao, Sheng

doi:10.1016/j.jphotochem.2006.03.036

Cited by 61 publications

(101 citation statements)

References 24 publications

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“…The experimental data on the photodecomposition quantum yields of the fluorene derivatives under one-photon excitation into the main absorption band are presented in Table 3. The values of Φ 1PA were obtained for the range of molecular concentrations 10 -3 M ≤ C ≤ 10 -6 M, as well as for air-saturated and deoxygenated solutions [70,71,73,74]. As follows from Table 3, the values of Φ 1PA strongly depend on the solvent properties.…”

Section: Photochemical Properties Of Fluorenes Under One-photon Excitmentioning

confidence: 94%

“…These methods are based on measurements of the temporal changes in the steady-state absorption and fluorescence spectra during irradiation. For the absorption method, the quantum yield of the photodecomposition under one-photon excitation, Φ 1PA , can be obtained by the equation [73]:…”

Section: Photochemical Properties Of Fluorenes Under One-photon Excitmentioning

confidence: 99%

“…The photochemical stability of the fluorene derivatives under two-photon excitation into the main absorption band was investigated by the fluorescence method described above, with the use of a Clark-MXR, CPA2010 femtosecond laser, an optical parametric generator/amplifier (TOPAS 4/800, Light Conversion) for the excitation and a PTI spectrofluorimeter for the detection [73]. The quantum yields of photodecomposition were calculated from the experimental data in a Gaussian spatial and temporal beam profile approximation [70,75] and are presented in Table 4.…”

Section: Photochemical Properties Of Fluorenes Under Two-photon Excitmentioning

confidence: 99%

See 2 more Smart Citations

Two-photon Absorbing Photonic Materials: From Fundamentals to Applications

Belfield

Yao

Bondar

2008

Advances in Polymer Science

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Section: Photochemical Properties Of Fluorenes Under One-photon Excitmentioning

confidence: 94%

Section: Photochemical Properties Of Fluorenes Under One-photon Excitmentioning

confidence: 99%

Section: Photochemical Properties Of Fluorenes Under Two-photon Excitmentioning

confidence: 99%

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Two-photon Absorbing Photonic Materials: From Fundamentals to Applications

Belfield

Yao

Bondar

2008

Advances in Polymer Science

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“…[25][26][27] Furthermore, the electron-withdrawing carbonyl group at C-9 stabilizes the LUMO of fluorene, making it remarkably electrophilic. 28 Substitution at positions 3 and 6 theoretically offers good electronic communication through the entire fluorenone skeleton.…”

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confidence: 99%

Synthesis and structure‐activity relationship of several aromatic ketone‐based two‐photon initiators

Siklos

Pucher

et al. 2011

J. Polym. Sci. A Polym. Chem.

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Several novel aromatic ketone-based two-photon initiators containing triple bonds and dialkylamino groups were synthesized and the structure-activity relationships were evaluated. Branched alkyl chains were used at the terminal donor groups to improve the solubility in the multifunctional monomers. Because of the long conjugation length and good coplanarity, the evaluated initiators showed large two-photon cross section values, while their fluorescence lifetimes and quantum yields strongly depend on the solvent polarity. All novel initiators exhibited high activity in terms of two-photon-induced microfabrication. This is especially true for fluorenone-based derivatives, which displayed much broader processing windows than well-known highly active initiators from the literature and commercially available initiators. While the new photoinitiators gave high reactivity in two-photoninduced photopolymerization at concentration as low as 0.1% wt, these compounds are surprisingly stable under one photon condition and nearly no photo initiation activity was found in classical photo DSC experiment.

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“…1, our basic idea was to build a branched system by combining two typical D-p-A systems. In view of its perfect planarity, p-conjugation, thermal and photochemical stabilities, the fluorenyl group, which confers excellent stability to the molecules in both the solid state and in solution [14,15], was chosen as the pelectron bridge. Dimesitylboryl groups were selected as the electronacceptors.…”

Section: Introductionmentioning

confidence: 99%