Energy transfer (EnT) is a fundamental activation process in visible-light-promoted photocycloaddition reactions. This work describes the performance of imidazoacridine-based TADF materials for visible-light mediated triplet-triplet EnT photocatalysis. The material ACR-IMAC has been discovered as an inexpensive, high-performance organic alternative to commonly used metal-based photosensitizers efficiency photosensitizer comparable with Ir-based both intra- and intermolecular [2 + 2]...

The synthesis of multicomponent nanoscale structures with precisely addressable function is critical to the discovery both new phenomena and applications in nanotechnology. Though self-assembly offers low-cost routes many such materials, these methods often require building blocks particular structural motifs, thus limiting scope nanomaterials that can be prepared ways. Herein we use a bottom-up approach based on covalent chemistry synthesize series bottlebrush copolymers from red, green,...

The electrochemical production of acid and base from water enables their use as regenerable reagents in closed-loop processes that drive chemical transformations by sequential addition. Such have attractive applications for industrial decarbonization including CO2 capture or mineralization low-temperature Ca(OH)2. Conventional methods acid-base utilize ion exchange membranes (IEMs) to inhibit proton (H+) hydroxide (OH–) recombination, but these components lead high resistive losses, low...

Methods are described for the preparation of fiber-like nanomaterials that mimic multilayer structure organic electronic devices on individual polymer chains. By combining Cu(0) reversible-deactivation radical polymerization (RDRP) and ring-opening metathesis (ROMP), multiblock bottlebrush copolymers synthesized from ordered sequences semiconductors. Narrowly dispersed fibers prepared materials commonly used as hole transport, electron host in electronics, with molecular weights exceeding 2...

A series of acrylic donor and acceptor monomers were prepared to investigate the effect electronic structural changes on through-space charge-transfer (TSCT) thermally activated delayed fluorescence (TADF) phenomenon. Donor (D) (A) copolymerized using a Cu(0) reversible-deactivation radical polymerization (RDRP) approach, resulting in nonconjugated polymers with molecular weights between 8 21 kDa dispersities below 1.3. Many found exhibit TSCT TADF, while several cases, phosphorescence...

A series of four acrylic monomers were synthesized based on p-type organic semiconductor motifs found commonly in light-emitting diodes (OLEDs), thin-film transistors (OTFTs) and photovoltaics (OPVs).

An N-phenylbenzimidazole constrained in a coplanar fashion with methylene tether (IMAC) was designed and used to prepare series of emitters exhibiting thermally activated delayed fluorescence (TADF). Four novel TADF using 9,9-dimethylacridine, phenoxazine, phenothiazine, bis(di-p-tolylamino)carbazole as the donor group were synthesized IMAC acceptor. Additionally, two deep-blue fluorescent prepared carbazole tercarbazole moieties. The twisted conformation between acceptor these molecules...

Brightly fluorescent semiconducting polymer dots (Pdots) are emerging as very useful probes for bioanalysis and imaging. Unfortunately, Pdot materials often suffer from limitations such poor colloidal physical stability, nonspecific adsorption, relatively few reported surface chemistries bioconjugate chemistries. To help address these limitations, we have developed dextran-functionalized Pdots (Dex-Pdots). This functionalization improves particle stability over a range of pH at high ionic...

Three acrylic monomers have been prepared based on organic semiconductor motifs commonly used as n-type materials in light-emitting diodes (OLEDs) and thin-film transistors (OTFTs) polymerized by Cu(0)-RDRP.

Consisting of polymeric side chains attached covalently to a linear backbone, bottlebrush copolymers provide route multicomponent nanoscale structures that remain nanosegregated regardless environmental conditions. This perspective highlights recent work on the preparation polymers from optoelectronic materials, creating new class nanofibers organic semiconductors. Bottlebrush have been synthesized polythiophenes and polyselenophenes as well materials commonly found in charge transport or...

Bottlebrush copolymers have shown promise as building blocks for self-assembled nanomaterials due to their reduced chain entanglement relative linear polymers and ability self-assemble with remarkably low critical micelle concentrations (CMCs). Concurrently, the preparation of bottlebrush from organic electronic materials has recently been described, allowing multiple optoelectronic functions be incorporated along length single strands. Here we describe self-assembly surfactants containing...

The synthesis and characterization of a new class nickel‐containing polymers is described. optimized copolymerization alkyne‐bearing nickel(II) complexes Goedken's macrocycle (4,11‐dihydro‐5,7,12,14‐tetramethyldibenzo[b,i][1,4,8,11]tetraazacyclotetradecine) brominated 9,9‐dihexylfluorene produced with potential application as functional redox‐active materials. title exhibit electrochemically reversible, ligand‐centered oxidation events at 0.24 0.73 V versus the ferrocene/ferrocenium redox...

Efficient deep blue luminescent materials are highly sought after for applications in both electronics and bioimaging.

ABSTRACT A series of acrylic monomers based on cyclometalated iridium(III) complexes have been synthesized common phosphorescent emitters for organic light‐emitting diodes. simple room‐temperature polymerization procedure these materials was developed using Cu(0) reversible deactivation radical polymerization, providing polymers with low dispersities 1.08–1.14 at conversions from 81 to 93% when the Ir are copolymerized a carbazole‐based host. These methods were also found be suitable...

Self-assembly presents bottom-up strategies for the construction of complex micelles from luminescent bottlebrush copolymers.

The synthesis and characterization of a series Group 6 metal pentacarbonyl complexes air stable primary, secondary, tertiary phosphines containing ferrocenylethyl substituents are reported [M(CO)5L: M = Cr, Mo, W; L PH2(CH2CH2Fc), PH(CH2CH2Fc)2, P(CH2CH2Fc)3]. structure composition the were confirmed by multinuclear NMR spectroscopy, IR UV-Vis absorption mass spectrometry, X-ray crystallography, elemental analysis. solid-state structural data revealed trends in M-C M-P bond lengths that...

Chemical transformations that are effected by sequential addition of acid and base can be performed in closed-loop processes powered electricity if the produced electrochemically from water. Conventional methods electrochemical acid-base production utilize ion exchange membranes (IEMs) to inhibit proton (H^+) hydroxide (OH^–) recombination, but these components lead high resistive losses, low current densities, poor tolerance for polyvalent metal ions, which compromise energy efficiency...

ABSTRACT The transesterification of 1,1,1,3,3,3‐hexafluoroisopropyl acrylate (HFIPA) homopolymers and block copolymers with methyl (MA) or n ‐butyl ( ‐BuA) were investigated for the efficient synthesis p‐type n‐type organic semiconductor acrylates. HFIPA, MA, ‐BuA are readily prepared in a one‐pot by Cu(0) reversible deactivation radical polymerization high yield low dispersity to give poly(HFIPA) 100 , PMA ‐ b ‐poly(HFIPA) x PnBuA = 100, 50,25). was also studied using 19 F NMR spectroscopy....

Millimeter sized polymer crystallites grow rapidly when anthracene-containing siloxanes are photocrosslinked using UV light.

Bottlebrush polymers with optoelectronic function show promise for applications in photonic crystals, nanomedicine, and encoding of information. In particular, bottlebrush formed from organic semiconductors give wire-like nanoparticles where band gaps, fluorescence, energy transfer can be tuned. To date, such have largely been prepared by grafting-through polymerization semiconductor macromonomers, pre-synthesized side chains are polymerized along a backbone. While this approach provides...

A dimer with two PdII–Me fragments is stabilized by the bridging coordination of supporting 1-azaallyl/phosphine ligand. Heating complex results in C(sp3)–C(sp3) bond formation and release ethane. Two different palladium products are generated, each distinct modes

A series of axially chiral sulfur-bridged dimers were prepared from 1,1'-binaphthyl-2,2'-diol and subsequently oxidized to the respective sulfones. The chiroptical properties chromophores studied as a function oxidation state. Upon oxidation, an increase in quantum yields was observed for directly linked sulfur bridged binaphthyls (0.04 0.32), modest dissymmetry factor diphenylsulfide-bridged (-8.9 × 10-4 -1.4 10-3). Computational calculations used elucidate changes photophysical properties.