Lawrence T. (Larry) Scott

Strange tetra-alcohol synthesised in simulated interstellar ice After finding 'impossible molecule' methanetriol, team reaches 'the final frontier' and detects methanetetrol after 100 years

More than 100 years after it was hypothesised, researchers have finally made methanetetrol – four hydroxyl groups linked to a single carbon atom.

Two-Photon Excited Circularly Polarized Luminescence of Hetero[9]helicene with Multiresonant Thermally Activated Delayed Fluorescence #PiSky

Synthesis of a Highly Luminescent Pyrrole-Fused Dicorannulene as a Corrugated π-Extended Carbazole A pyrrole-fused dicorannulene was designed and synthesized via Pd-catalyzed reactions. This molecule can be regarded as a corrugated π-extended carbazole, which exhibited efficient blue fluorescence (...

Congratulations Takayuki - Synthesis of a Highly Luminescent Pyrrole-Fused Dicorannulene as a Corrugated π-Extended Carbazole | Organic Letters pubs.acs.org/doi/10.1021/... #PiSky

A Heptagon-Embedded Structural Isomer of Azacorannulene A nitrogen-doped heptagon-embedded bowl-shaped molecule that can be viewed as a structural isomer of azacorannulene was synthesized and characterized. The presence of a seven-membered ring significantly alters the molecular electronic structure and results in a distinct optical property. The pyramidalized geometry of nitrogen is crucial for releasing the molecular strain as well as rendering the fused pentagonal rings aromaticity to enhance the molecular stability.

A Heptagon-Embedded Structural Isomer of Azacorannulene | Organic Letters pubs.acs.org/doi/10.1021/... #PiSky

Stereoselectivity in Cyclostereoisomerism: A Case Study with Belt-Persistent Cylindrical Molecules Oxidative reactions of a chiral molecular segment of carbon nanotubes afforded a chiral macrocycle with multiple stereogenic units. The cylinder chirality originally described by a single descriptor o...

Stereoselectivity in Cyclostereoisomerism: A Case Study with Belt-Persistent Cylindrical Molecules | Organic Letters pubs.acs.org/doi/full/10.... #PiSky

Stereodirected Construction of Lemniscular Metallacycles via Linear d10 AgI/AuI–NHC Coordination Engineering

doi.org/10.1002/cjoc...

A Simple Route to Stable Antiaromatic Compounds from Diazaporphyrins - ChemistryViews Hiroshi Shinokubo, Japan, and his coauthors discovered a simple reductive dimethylation that transforms Ni(II) 5,15-diazaporphyrins into stable, antiaromatic porphyrinoids

Hiroshi Shinokubo, Japan, and his coauthors discovered a simple reductive dimethylation that transforms Ni(II) 5,15-diazaporphyrins into stable, antiaromatic porphyrinoids
🧪Research Highlight from a @chemistryeurope.bsky.social journal
www.chemistryviews.org/a_simple_rou...

Excited-State Antiaromaticity Relief Triggers Singlet Fission in Nonbenzenoid Polycyclic Hydrocarbon | CCS Chemistry Singlet fission (SF) offers the potential to improve the efficiency of photovoltaic devices (PVs) by harnessing high-energy photons to produce doubled photocurrents. However, progress in SF-based PVs ...

Excited-State Antiaromaticity Relief Triggers Singlet Fission in Nonbenzenoid Polycyclic Hydrocarbon | CCS Chemistry www.chinesechemsoc.org/doi/10.31635... #PiSky

Twelvefold Dearomative Esterification of (6,6)Carbon Nanobelt A new carbon nanobelt derivative bearing twelve ester groups has been successfully synthesized from fully conjugated (6,6)carbon nanobelt by the unique Mg-promoted dearomative esterification. This si...

Twelvefold Dearomative Esterification of (6,6)Carbon Nanobelt - Okumura - Angewandte Chemie International Edition - Wiley Online Library onlinelibrary.wiley.com/doi/10.1002/... #PiSky

Engineering Graphene Nanoribbons via Periodically Embedding Oxygen Atoms Two types of oxygen-doped graphene nanoribbons (O-doped chevron-GNR and O-doped chiral (2,1)-GNR) were synthesized on Au(111) via in situ formation of pyrans. Both O-doped GNRs are direct bandgap sem....

Engineering Graphene Nanoribbons via Periodically Embedding Oxygen Atoms - Zhao - Angewandte Chemie International Edition - Wiley Online Library onlinelibrary.wiley.com/doi/10.1002/... #PiSky

On-Surface Synthesis and Characterization of Tetraazanonacene onlinelibrary.wiley.com/doi/full/10.... #PiSky

A Self-Cyclocondensation Approach for the Synthesis of a Cycloparaphenylene-End-Capped Molecular Cylinder The synthesis of molecular cylinders is challenging due to their intrinsic strain and the complexity of the structure. Here we report an efficient self-cyclocondensation approach for the construction of molecular cylinder MC3, taking advantage of a cycloparaphenylene precursor comprising both diamine and diketone moieties within the macrocyclic skeleton. The tilted cylindrical geometry of MC3 was revealed by X-ray single crystal analysis, and variable temperature NMR analysis suggested a dynamic time-averaged structure in the solution phase. MC3 exhibits distinct optical properties, including solvatofluorochromism and a moderate fluorescence quantum yield, associated with the CT characteristics of the excited state. The building block in this study may be further employed for the construction of polymeric structures and fully fused cylindrical structures.

A Self-Cyclocondensation Approach for the Synthesis of a Cycloparaphenylene-End-Capped Molecular CylinderClick pubs.acs.org/doi/10.1021/... #PiSky

Alternating Donor–Acceptor Carbon Nanohoops: Synthesis and Photophysical and Supramolecular Properties Herein, we report alternating boron dipyrromethene (BODIPY)-based donor-acceptor (D–A) carbon nanohoops, BCN-1 and BCN-2. These D–A nanohoops exhibit a narrow HOMO–LUMO gap, high molar extinction coef...

Alternating Donor–Acceptor Carbon Nanohoops: Synthesis and Photophysical and Supramolecular Properties pubs.acs.org/doi/10.1021/... #PiSky

Helical π-Conjugated Structure Based on Complementary Helical Monomers with Circularly Polarized Luminescence A fully π-conjugated helical system combining rigid [6]helicenes and a flexible o-OPE unit has been developed, yielding enantiopure emitters with up to three helical loops. The compounds display remar...

Helical π-Conjugated Structure Based on Complementary Helical Monomers with Circularly Polarized Luminescence pubs.acs.org/doi/10.1021/... #PiSly

All-Aza meso-Benzo-Fused Triphyrins(2.1.1): Large Bathochromic Shift and Intensified Absorption via π-Extended Conjugation The topology that would be dependent on the effectiveness of π-electron coupling is significantly tuned by the strong conjugation that exists in fused systems. Side or linear fusion of unsaturated and conjugated hydrocarbons can have a significant effect on the π-electron cloud that is accessible in the final structure. The syntheses of three all-aza benzene-annulated triphyrins(2.1.1) were revealed. Because of the π extension, the lowest-energy Q band is not only red-shifted by more than 100 nm but also intensified to a great extent, indicating 18π-aromatic characteristics.

All-Aza meso-Benzo-Fused Triphyrins(2.1.1): Large Bathochromic Shift and Intensified Absorption via π-Extended Conjugation pubs.acs.org/doi/10.1021/... #PiSky

Precise Synthesis of Ester-Functionalized Cyclo[6]- and Cyclo[7]furans Shape-persistent conjugated macrocycles have attracted interest for their unique optoelectronic and self-assembly properties, but the syntheses to obtain these structures can be laborious. In this work, we describe the straightforward synthesis of a recently discovered class of macrocycle, the cyclo[n]furan, using Suzuki–Miyaura cross-coupling of a simple aromatic monomer. We demonstrate that the combination of hexyl 2-bromo-5-(boronic acid pinacol ester)furan-3-carboxylate with tris(dibenzylideneacetone)dipalladium(0), tri-tert-butylphosphonium tetrafluoroborate and cesium fluoride leads to cyclo[6]- and cyclo[7]furan esters in 45% yield (28% and 17%, respectively). Crude 1H NMR spectroscopy revealed that total conversion to macrocycles was 52 ± 6% over 3 runs, highlighting the robustness of this protocol for cyclofuran synthesis. The oligomerizations are rapid, and model compound studies suggest that a chain-growth mechanism may be operative. The hexyl-substituted cyclo[n]furan esters (n = 6 and 7) are separable via column chromatography. The unique optical and electronic features for each cycle can be partially explained by the size difference for the two systems, as well as the increased conformational flexibility for the larger, ester-functionalized cyclo[7]furan.

Cyclo[6]- and Cyclo[7]furans pubs.acs.org/doi/10.1021/... #PiSky

Frustration-Induced Many-Body Degeneracy in Spin −1/2 Molecular Quantum Rings Frustrated spin systems, where competing interactions prevent conventional magnetic ordering, provide a platform for uncovering emergent quantum phases and exotic many-body phenomena. Particularly, lo...

Cyclic pentamer and hexamer phenalenyl derivatives on Au(111) pubs.acs.org/doi/10.1021/... #PiSky

Silicon-based ‘ladder molecules’ take a step up in complexity New compounds are 'among the most complex organosilanes ever synthesised'

Ladder molecules just got more complex, with a series of compounds featuring fused six-membered silicon rings, created by reacting a silicon dianion with a tetrasubstituted cyclohexasilane ring. #ChemSky

Face-to-Face Helical Columns with Permanent Polarity Consisting of Homochiral End-Functionalized Helicenes Chiral π-conjugated molecules hold great potential for applications in spin-selective organic semiconductors and chiroptical electronic devices that respond to circularly polarized light. Their perfor...

New helicenes pubs.acs.org/doi/10.1021/... #PiSky

Check out our most recent paper in @chemrxiv.bsky.social (doi.org/10.26434/che...), documents a nice structure-property relationship of the impact of incorporation of spirobifluorene units on the photophysics and device performance of DiKTa-based #mrtadf emitters and #oleds.
@braeselab.bsky.social

Optical and nonlinear optical properties calculated for derivatives of rippled C84 www.sciencedirect.com/science/arti... #PiSky

Solution is not the only solution: nanographenes by mechanochemistry - nice review, Ela sciencedirect.com/science/arti... #PiSky

A Nitrogen‐Containing Graphenic Buckybowl for Photocatalysis and Assembly With Fullerenes Hexa-peri-hexabenzocoronene (HBC) is bent to a nitrogen-containing buckybowl (3N-HBC) through the incorporation of only three pentagons. The electron-donating nature and curved π-surface of 3N-HBC en...

A Nitrogen‐Containing Graphenic Buckybowl for Photocatalysis and Assembly With Fullerenes - Liu - Angewandte Chemie International Edition - Wiley Online Library onlinelibrary.wiley.com/doi/10.1002/... #PiSky

Ring Contraction of Cyclooctatetraenes toward Non‐Benzenoid Polycyclic Aromatic Hydrocarbons by Au(111)‐Catalysis and Bulk Pyrolysis The Au(111)-catalyzed cyclodehydrogenation of tetraphenylated DA-COT and TA-COT is compared with bulk pyrolysis. On Au(111), a strain-induced contraction of the central COT unit toward six-membered r....

Ring Contraction of Cyclooctatetraenes toward Non‐Benzenoid Polycyclic Aromatic Hydrocarbons by Au(111)‐Catalysis and Bulk Pyrolysis - Weigold - Chemistry – A European Journal - Wiley Online Library chemistry-europe.onlinelibrary.wiley.com/doi/10.1002/... #PiSky

Enantiomer-enriched π-extended helicenes with a perylene core from binaphthol: axial-to-helical chirality transfer with a stepwise Scholl reaction mechanism π-Extended helicenes, as chiral nanographene molecules, possess unique chiral structures and properties, making them highly valuable for applications in advanced chiral materials. However, their enant...

Enantiomer-enriched π-extended helicenes with a perylene core from binaphthol: axial-to-helical chirality transfer with a stepwise Scholl reaction mechanism - now published in Chemical Science pubs.rsc.org/en/content/a... #PiSky

Chirality Unbound in Graphene Nanoribbons This study unveils a method to wind chiral graphene nanoribbons into either right-handed or left-handed helices, depending on the functional groups that adorn their edges. These helically wound graph...

Chirality Unbound in Graphene Nanoribbons onlinelibrary.wiley.com/doi/10.1002/... #PiSky

Terbenzo- and Tetrabenzoolympicenyl Radicals and Their Cations www.mdpi.com/2624-8549/7/... #PiSky

Lanthanide–carbon triple bond synthesised and characterised Cluster stabilised within a C80 fullerene cage

A bond between cerium and carbon, encapsulated within a C80 fullerene cage, is the first lanthanide-carbon triple bond to be created. #ChemSky

#PiSky

Double [8]Helicene Featuring a Dibenzo[g,p]chrysene Core: Synthesis and Chiroptical Response Double [8]helicene 1, featuring a dibenzo[g,p]chrysene core, was synthesized via the Scholl reaction, and its structure was unambiguously confirmed by single-crystal X-ray diffraction analysis of its dicationic salt [1–Cl]2+·(SbCl6–)2. The compound exhibits red fluorescence with an emission maximum at 618 nm (λem) and a quantum yield of 16.2%, highlighting its potential in optoelectronic applications. Furthermore, circular dichroism (CD) and circularly polarized luminescence (CPL) measurements reveal notable chiroptical activity, with absorption and emission dissymmetry factors of |gabs| = 5.11 × 10–3 and |glum| = 7.1 × 10–4, respectively.

Double [8]Helicene Featuring a Dibenzo[g,p]chrysene Core: Synthesis and Chiroptical Response | Organic Letters pubs.acs.org/doi/10.1021/... #PiSky