Enhanced two-photon absorption properties of weakly conjugated oligomers

Martineau, Claude; Lemercier, Gilles; Andraud, Chantal

doi:10.1016/s0925-3467(02)00199-4

Cited by 19 publications

(7 citation statements)

References 8 publications

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“…Equation (5) shows the relation between the angle θ of the coupling monomer unit (Figure 3), the transition dipole of the respective monomer unit ${\overrightarrow{\mu }}$ ${{{m\hfill \atop ij\hfill}}}$ , and the number of coupling units N 25. 26b In a stiff, conjugated sample, the angle θ can be small, depending on the molecular constitution, and therefore ${\overrightarrow{\mu }}$ ij is often only slightly diminished according to Equation (5) if θ becomes slightly larger than zero. The parameter N is related to the molecular weight of the sample.…”

Section: Resultsmentioning

confidence: 99%

One‐ and Two‐Photon Photochemistry and Photophysics of Poly(arylenevinylene)s Containing a Biphenyl Moiety

et al. 2005

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Photochemical and photophysical properties were investigated for poly(arylenevinylene)s containing a flexible biphenyl "hinge" unit by applying one-photon (OP) and two-photon (TP) excitation to explore excited-state properties. The poly(arylenevinylene)s were poly[(2,5-dihexyloxy-p-phenylenevinylene)-alt-(4,4'-dihexyloxy-3,3'-biphenylenevinylene)] (1), poly[(2,5-dihexyloxy-p-phenylenevinylene)-alt-(2,2'-dihexyloxy-3,3'-biphenylenevinylene)] (2), and poly[(2,5-dihexyloxy-p-phenylenevinylene)-alt-(2,2'-biphenylenevinylene)] (3). Effective emission quantum yields and related photonic properties were evaluated on a realistic per-chromophore basis using effective conjugation lengths based on the Strickler-Berg relationship. Intramolecular photocyclization was deduced to occur in the one case where the biphenyl molecular connectivity permitted the reaction, based on matrix-assisted laser desorption/ionization time-of-flight (MALDI-TOF), heteronuclear multiple-quantum coherence (HMQC)-NMR, and gel-permeation chromatography (GPC) results. The various photoprocesses could be induced by either OP or TP excitation, though the first excited singlet state is the photoactive state. The higher excitation energy of the TP excited state favors indirect population of the S, state by electronic coupling between the TP and OP excited states [lambda(max)TPE (nm): 726; delta (GM): 1=229, 2=215, 3= 109). Photochemical processes occurring from the lowest OP excited state (S1) could therefore also be indirectly induced by TP excitation.

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Section: Resultsmentioning

confidence: 99%

One‐ and Two‐Photon Photochemistry and Photophysics of Poly(arylenevinylene)s Containing a Biphenyl Moiety

et al. 2005

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“…Its uncaging cross‐section has been increased in comparison with the well‐known methoxynitrobenzyl platform by extending the π system. Another approach was proposed by Andraud, Baldeck, and co‐workers, who pointed out that TPA cross‐sections of oligomers can be enhanced by biexcitonic coupling between two weakly conjugated monomers 24–26. We applied this concept to the molecular engineering of new linear caging platforms.…”

Section: Methodsmentioning

confidence: 99%

Molecular Engineering of Photoremovable Protecting Groups for Two‐Photon Uncaging

Gug

Bolze²,

Specht

et al. 2008

Angewandte Chemie

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“…Another approach was proposed by Andraud, Baldeck, and co-workers, who pointed out that TPA cross-sections of oligomers can be enhanced by biexcitonic coupling between two weakly conjugated monomers. [24][25][26] We applied this concept to the molecular engineering of new linear caging platforms. The first designed molecule Figure 2) was composed of two vinylogues of PMNB linked together to take advantage of a possible interaction between the two monomers.…”

mentioning

confidence: 99%

Molecular Engineering of Photoremovable Protecting Groups for Two‐Photon Uncaging

Gug

Bolze²,

Specht

et al. 2008

Angew Chem Int Ed

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Open the cage: Symmetrical photoremovable bis‐glutamate cages have been designed, synthesized, and characterized that can release a neurotransmitter with unprecedented two‐photon efficiencies (see picture), up to 5 GM for BNSF–Glu (BNSF=2,7‐bis‐{4‐nitro‐8‐[3‐(2‐propyl)‐styryl]}‐9,9‐bis‐[1‐(3,6‐dioxaheptyl)]‐fluorene) at 800 nm, the optimal window both for tissue transparency and classically available laser sources.

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Enhanced two-photon absorption properties of weakly conjugated oligomers

Cited by 19 publications

References 8 publications

One‐ and Two‐Photon Photochemistry and Photophysics of Poly(arylenevinylene)s Containing a Biphenyl Moiety

One‐ and Two‐Photon Photochemistry and Photophysics of Poly(arylenevinylene)s Containing a Biphenyl Moiety

Molecular Engineering of Photoremovable Protecting Groups for Two‐Photon Uncaging

Molecular Engineering of Photoremovable Protecting Groups for Two‐Photon Uncaging

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