Polyhedral oligomeric silsesquioxane‐bound iminofullerene

Clarke, David J.; Matisons, Janis G.; Simon, George P.; Samoć, Marek; Samoc̀, Anna

doi:10.1002/aoc.1568

“…Among various inorganic building blocks, polyhedral oligomeric silsesquioxanes (POSS) are a new class of condensed three‐dimensional oligomeric organosiliceous compounds with cage frameworks. They provide an excellent platform for the synthesis of organic–inorganic molecular hybrid materials10 and have resulted in the recent preparation of quite a number of novel POSS‐containing molecular hybrid materials including MCM‐POSS,11a C 60 ‐POSS,11b and graphene‐POSS 11c. However, POSS‐containing molecular hybrid materials with porphyrin as organic component remain unknown.…”

Section: Methodsmentioning

confidence: 99%

Porphyrin‐POSS Molecular Hybrids

Sun

¹

,

Chen

²

,

Zhao

³

et al. 2013

Chemistry A European J

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Porphyrin-POSS hybrid: Porphyrin-POSS molecular hybrid composites (see scheme; POSS = polyhedral oligomeric silsesquioxanes) were synthesized and structurally characterized, allowing the realization of truly homogenous dispersion of basic functional building blocks between organic and inorganic components at the molecular level. These materials allow the optimization of aggregation/association behavior and thus the functional optical properties of the porphyrinato zinc compounds.

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“…11 A wide variety of research has been conducted on SQ based systems towards developing materials applicable in electronic and photonic applications. 39 Most of these studies have been dedicated to the chromophore functionalization of SQ cages at each cage corner, [40][41][42][43][44] monofunctionalization of one corner, [45][46][47] or their use as conjugated oligomer stabilizers. 11,35 Sellinger et al used mono and multifunctionalized T8 cage systems with fluorene based conjugated moieties for applications as OLED emitters.…”

Section: Introductionmentioning

confidence: 99%

Beads on a Chain (BoC) Fluorescent Oligomeric Materials: Interactions of Conjugated Organic Cross-Linkers with Silsesquioxane Cages

Mahbub¹,

Saha²,

Ramakrishna³

et al. 2021

Preprint

0

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<div> <div> <div> <p>Organic electronic materials have advantages over inorganics in terms of versatility, cost and processability. Recent advancements in organic materials for light emitting diodes (OLED), field effect transistors (OFET), and photovoltaics have engendered extensive innovation potential on this field. In this research, we focus on synthesizing SQ (silsesquioxane) based oligomers cross- linked by di-bromo-aromatic linkers and explore how the cross-linker and oligomer length influence their photophysical properties. Bis-tri-alkoxy silyl (linker) model compounds were synthesized to compare non-cage photophysical properties with the oligomers. Several techniques such as UV/Vis, fluorescence, FTIR, thermal gravimetric analysis (TGA) have been used to characterize the systems. Time-resolved fluorescence and femtosecond transient absorption spectroscopy are used to understand the excited state dynamics of these materials. Studies are carried out to understand the differences between monomers and oligomers and potential energy transfer and charge transfer between the cages and cross-linking chromophores. Transient absorption showed lower energy absorption from the excited states, suggesting short range communication between moieties. Single photon counting studies have shown distinct lifetime differences between most linkers and cages showing possible excitation energy transfer through these materials. Transient absorption anisotropy measurements have shown signatures for excitation energy transfer between linker chromophores for oligomeric compounds. The silsesquioxane (SQ) backbone of the oligomers gives substantial thermal stability as well as solution processability, giving better flexibility for achieving energy transfer between linking chromophores. </p> </div> </div> </div>

show abstract

“…11 A wide variety of research has been conducted on SQ based systems towards developing materials applicable in electronic and photonic applications. 39 Most of these studies have been dedicated to the chromophore functionalization of SQ cages at each cage corner, [40][41][42][43][44] monofunctionalization of one corner, [45][46][47] or their use as conjugated oligomer stabilizers. 11,35 Sellinger et al used mono and multifunctionalized T8 cage systems with fluorene based conjugated moieties for applications as OLED emitters.…”

Section: Introductionmentioning

confidence: 99%

Beads on a Chain (BoC) Fluorescent Oligomeric Materials: Interactions of Conjugated Organic Cross-Linkers with Silsesquioxane Cages

Mahbub¹,

Saha²,

Ramakrishna³

et al. 2021

Preprint

1

0

View full text Add to dashboard Cite

<div> <div> <div> <p>Organic electronic materials have advantages over inorganics in terms of versatility, cost and processability. Recent advancements in organic materials for light emitting diodes (OLED), field effect transistors (OFET), and photovoltaics have engendered extensive innovation potential on this field. In this research, we focus on synthesizing SQ (silsesquioxane) based oligomers cross- linked by di-bromo-aromatic linkers and explore how the cross-linker and oligomer length influence their photophysical properties. Bis-tri-alkoxy silyl (linker) model compounds were synthesized to compare non-cage photophysical properties with the oligomers. Several techniques such as UV/Vis, fluorescence, FTIR, thermal gravimetric analysis (TGA) have been used to characterize the systems. Time-resolved fluorescence and femtosecond transient absorption spectroscopy are used to understand the excited state dynamics of these materials. Studies are carried out to understand the differences between monomers and oligomers and potential energy transfer and charge transfer between the cages and cross-linking chromophores. Transient absorption showed lower energy absorption from the excited states, suggesting short range communication between moieties. Single photon counting studies have shown distinct lifetime differences between most linkers and cages showing possible excitation energy transfer through these materials. Transient absorption anisotropy measurements have shown signatures for excitation energy transfer between linker chromophores for oligomeric compounds. The silsesquioxane (SQ) backbone of the oligomers gives substantial thermal stability as well as solution processability, giving better flexibility for achieving energy transfer between linking chromophores. </p> </div> </div> </div>

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Polyhedral oligomeric silsesquioxane‐bound iminofullerene

Cited by 20 publications

References 46 publications

Porphyrin‐POSS Molecular Hybrids

Porphyrin‐POSS Molecular Hybrids

Beads on a Chain (BoC) Fluorescent Oligomeric Materials: Interactions of Conjugated Organic Cross-Linkers with Silsesquioxane Cages

Beads on a Chain (BoC) Fluorescent Oligomeric Materials: Interactions of Conjugated Organic Cross-Linkers with Silsesquioxane Cages

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