Fluorescence of molecular micro- and nanocrystals prepared with Bodipy derivatives

Badré, Sophie; Monnier, Virginie; Méallet‐Renault, Rachel; Dumas‐Verdes, Cécile; Schmidt, Elena Yu.; Михалева, А. И.; Laurent, Guillaume; Lévi, G.; Ibanez, Alain; Трофимов, Б. А.; Pansu, Robert

doi:10.1016/j.jphotochem.2006.07.002

Cited by 30 publications

(19 citation statements)

References 37 publications

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“…Enhanced bands at 1530 and1 504 cm À1 are within the characteristic frequency range of dipyrrin. [23,25] Three bands between 1170-1300 cm À1 are consistentw ith the pyrrole and diene.Aband at 1175 cm À1 is close in wavenumber to ab and reported at 1172 cm À1 for crystalso fb odipy analogues by BadrØ et al [26] These enhanced bands correspond with geometry changes duringt he photoexcitation. Figure 4a lso contains the rR spectra of P1 j NiO and 4 j NiO recorded using an excitation wavelength of 413 nm.…”

Section: Resonance Raman Spectrasupporting

confidence: 84%

Resonance Raman Study of New Pyrrole‐Anchoring Dyes for NiO‐Sensitized Solar Cells

et al. 2017

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Three dyes for p-type dye-sensitised solar cells containing a novel doubly anchored pyrrole donor group were synthesised and their solar cell performances were evaluated. Dye 1 was comprised of a phenyl-thiophene linker and a maleonitrile acceptor, which has been established as an effective motif in other push-pull dyes. Two boron dipyrromethane analogues, dyes 2 and 3, were made with different linker groups to compare their effect on the behaviour of these dyes adsorbed onto nickel oxide (dye|NiO) under illumination. The photoexcited states of dye|NiO were probed using resonance Raman spectroscopy and compared to dyes anchored using the conventional 4-aminobenzoic acid moiety (P1 and 4). All three components, the anchor, the linker and the acceptor group were found to alter both the electronic structure following excitation and the overall solar cell performance. The bodipy acceptor gave a better performance than the maleonitrile acceptor when the pyrrole anchor was used, which is the opposite of the triphenylamine push-pull dyes. The linker group was found to have a large influence on the short-circuit current and efficiency of the p-type cells constructed.

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Section: Resonance Raman Spectrasupporting

confidence: 84%

Resonance Raman Study of New Pyrrole‐Anchoring Dyes for NiO‐Sensitized Solar Cells

et al. 2017

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“…[76,77] Theoretical results indicate that this visible absorption band can be assigned to the promotion of an electron from the HOMO to the LUMO. [81][82][83][84][85][86][87][88] The fluorescence spectrum of BODIPY with a maximum emission at l % 518 nm, from which the energy of the singlet state of BODIPY ( 1 BODIPY*) is % 2.4 eV, is practically the mirror image of the S 0 !S 1 absorption band ( Figure 3); this suggests similar vibrational levels in both electronic states. [76] This low tendency of BODIPYs to self-associate is a very important advantage of these dyes with respect to other dyes because the formation of non-or poorly fluorescent aggregates drastically reduces the fluorescent intensity in concentrated solutions, which are generally required to record the laser signal.…”

Section: Structure and Photophysical Properties Of Bodipysmentioning

confidence: 99%

“…[80] The BODIPYs are highly fluorescent relative to porphyrins and phthalocyanines with fluorescence quantum yields that sometimes approach unity. [81][82][83][84][85][86][87][88] The fluorescence spectrum of BODIPY with a maximum emission at l % 518 nm, from which the energy of the singlet state of BODIPY ( 1 BODIPY*) is % 2.4 eV, is practically the mirror image of the S 0 !S 1 absorption band ( Figure 3); this suggests similar vibrational levels in both electronic states. Indeed, the results of quantum mechanical calculations indicate that the optimized geometry in the S 1 excited state is similar to that of the S 0 ground state.…”

Section: Structure and Photophysical Properties Of Bodipysmentioning

confidence: 99%

Photosynthetic Antenna–Reaction Center Mimicry by Using Boron Dipyrromethene Sensitizers

2013

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Various molecular and supramolecular systems have been synthesized and characterized recently to mimic the functions of photosynthesis, in which solar energy conversion is achieved. Artificial photosynthesis consists of light-harvesting and charge-separation processes together with catalytic units of water oxidation and reduction. Among the organic molecules, derivatives of BF2-chelated dipyrromethene (BODIPY), "porphyrin's little sister", have been widely used in constructing these artificial photosynthetic models due to their unique properties. In these photosynthetic models, BODIPYs act as not only excellent antenna molecules, but also as electron-donor and -acceptor molecules in both the covalently linked molecular and supramolecular systems formed by axial coordination, hydrogen bonding, or crown ether complexation. The relationships between the structures and photochemical reactivities of these novel molecular and supramolecular systems are discussed in relation to the efficiency of charge separation and charge recombination. Femto- and nanosecond transient absorption and photoelectrochemical techniques have been employed in these studies to give clear evidence for the occurrence of energy- and electron-transfer reactions and to determine their rates and efficiencies.

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“…[38] This adds up to the possibility of the formation of excimers, which provedt oq uencht he BODIPY emission as well. [39] Moreover,a sp ointed out in Vu's study,o ther potential contributions to the reduction of the lifetimes may arise from: 1) the fact that the dyes experience different local environments once embedded into am atrix, leadingt oapossible solvatochromice ffect,a nd 2) the formation of statistical pairs of dyes [40,41] that act as non-fluorescent traps of the excitation energy.…”

Section: Photophysicsmentioning

confidence: 95%

Light‐Harvesting Antennae using the Host–Guest Chemistry of Mesoporous Organosilica

et al. 2017

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This study presents two series of new host–guest chromophoric systems, where BODIPY dyes are organized into mesoporous silica. The dyes self‐assemble with surfactants to generate micellar templates that can direct the formation of the silica networks. The materials were characterized by means of small‐angle X‐ray scattering (SAXS) and transmission electron microscopy (TEM) to elucidate their structure, and by UV/Vis absorption spectroscopy to determine their optical properties. Dye‐loaded COK‐12 materials retain an ordered structure and exhibit a green fluorescence that slightly red‐shifts and undergoes quenching as the dye loading increases. A second system is based on MCM‐41 silica and works as a polychromatic antenna, where a high energy species forms within the template and drive excitation energy transfer in timescales down to 20 ps. Such systems show promising performances for the realization of photonic antennae, to be used as sensitizers for solar cells and photocatalytic devices.

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Fluorescence of molecular micro- and nanocrystals prepared with Bodipy derivatives

Cited by 30 publications

References 37 publications

Resonance Raman Study of New Pyrrole‐Anchoring Dyes for NiO‐Sensitized Solar Cells

Resonance Raman Study of New Pyrrole‐Anchoring Dyes for NiO‐Sensitized Solar Cells

Photosynthetic Antenna–Reaction Center Mimicry by Using Boron Dipyrromethene Sensitizers

Light‐Harvesting Antennae using the Host–Guest Chemistry of Mesoporous Organosilica

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