Tunable absorption and emission wavelength in conjugated microporous polymers by copolymerization

Brandt, Jessica; Schmidt, Johannes; Thomas, Arne; Epping, Jan Dirk; Weber, Jens

doi:10.1039/c1py00217a

Cited by 53 publications

(34 citation statements)

References 15 publications

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“…22 Others showed that the fluorescence of microporous polymers can be varied by copolymerization strategies. 23 Copolymerization was also used to prepare polymers with tunable gas sorption properties. 24 Of particular relevance here, we were able to tune the optical gap for pyrene-based CMPs by statistical copolymerization.…”

Section: Introductionmentioning

confidence: 99%

Tunable Organic Photocatalysts for Visible-Light-Driven Hydrogen Evolution

et al. 2015

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Photocatalytic hydrogen production from water offers an abundant, clean fuel source, but it is challenging to produce photocatalysts that use the solar spectrum effectively. Many hydrogen-evolving photocatalysts are active in the ultraviolet range, but ultraviolet light accounts for only 3% of the energy available in the solar spectrum at ground level. Solid-state crystalline photocatalysts have light absorption profiles that are a discrete function of their crystalline phase and that are not always tunable. Here, we prepare a series of amorphous, microporous organic polymers with exquisite synthetic control over the optical gap in the range 1.94-2.95 eV. Specific monomer compositions give polymers that are robust and effective photocatalysts for the evolution of hydrogen from water in the presence of a sacrificial electron donor, without the apparent need for an added metal cocatalyst. Remarkably, unlike other organic systems, the best performing polymer is only photoactive under visible rather than ultraviolet irradiation.

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Section: Introductionmentioning

confidence: 99%

Tunable Organic Photocatalysts for Visible-Light-Driven Hydrogen Evolution

et al. 2015

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“…Although we have successfully synthesized a novel POF, the gas storage capacity of this material is very poor. Statistical copolymerization has been used as a means of tuning POF properties in a small number of studies . Schmidt et al showed similar effects with POF prepared using Yamamoto coupling .…”

Section: Introductionmentioning

confidence: 84%

Synthesis and Gas Storage Application of Hierarchically Porous Materials

Ben

Qiu

2016

Macro Chemistry & Physics

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Porous organic frameworks (POFs) have been synthesized by Yamamoto‐type Ullmann cross‐coupling reaction using tetrakis (4‐bromophenyl) methane (TBPM) and poly‐4‐bromostyrene (PBS) as monomers. Among these POFs, JUC‐Z13 synthesized solely from PBS is found to be microporous (1.27 nm) and SBET = 372 m2 g−1, and copolymerization with TBPM results in POFs with apparent surface areas up to 3137 m2 g−1 and pore size up to 1.41 nm. Interestingly, JUC‐Z14 and JUC‐Z15 show hierarchical porosity. Low pressure gas uptake experiments on activated JUC‐Z13‐JUC‐Z19 show enhanced gas storage capacities and isosteric heats of sorption (Qst) among porous materials.

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“…Depending on the desired molecular properties, each fluorene unit can be structurally varied and modified. Therefore, the functionalization of such spirobifluorenes provides access to defined and tailor‐made cavities, highly attractive for the design of MOFs and porous organic polymers (POPs) . The resulting MOFs and POPs have exceptional adsorption properties and have various applications in gas separation, energy storage, and catalysis .…”

Section: Methodsmentioning

confidence: 99%

Solvent‐Adaptive Behavior of Oligospirobifluorenes at the Surface of Quartz Crystal Microbalances—A Conformational Process

et al. 2017

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Oligospirobifluorenes represent promising building blocks for the generation of microporous sensor materials based on their restricted flexibility. The contact with specific solvents leads to a change of the three‐dimensional spirobifluorene structure. The single fluorene moieties unfold to an open structure with an increased volume due to intermolecular interactions with the solvent, detectable by NMR spectroscopy. The induced microporosity was further investigated by affinity comparisons of aromatic analytes with high fundamental frequency quartz crystal microbalances.

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Tunable absorption and emission wavelength in conjugated microporous polymers by copolymerization

Cited by 53 publications

References 15 publications

Tunable Organic Photocatalysts for Visible-Light-Driven Hydrogen Evolution

Tunable Organic Photocatalysts for Visible-Light-Driven Hydrogen Evolution

Synthesis and Gas Storage Application of Hierarchically Porous Materials

Solvent‐Adaptive Behavior of Oligospirobifluorenes at the Surface of Quartz Crystal Microbalances—A Conformational Process

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