Tighten your belt: [12]Cycloparaphenylene, the sidewall segment of a carbon nanotube (see picture), has been synthesized in selective manner through stepwise palladium-catalyzed coupling reactions. The synthesis capitalizes on ability cis-1,4-dihydroxycyclohexane-1,4-diyl unit to attenuate build-up strain energy during macrocyclization. Detailed facts importance specialist readers are published as ”Supporting Information”. Such documents peer-reviewed, but not copy-edited or typeset. They...

Since their discovery in 1991, carbon nanotubes (CNTs) have attracted significant attention because of remarkable mechanical, electronic, and optical properties. Structural uniformity the CNT is critically important sidewall structures (armchair, zigzag, chiral) determine many properties CNTs. Ideally researchers would synthesize CNTs with a defined target structure diameter, but current synthetic methods, such as arc discharge chemical vapor deposition, only provide mixtures various...

We studied the UV-vis absorption and fluorescence in solution/solid states of [n]cycloparaphenylene ([n]CPP: n = 9, 12, 14, 15, 16), conducted theoretical studies to better understand experimental results. The representative findings include (i) most intense maxima (λ(abs1)) display remarkably close values (338-339 nm), (ii) longest-wavelength (λ(abs2)) are blue-shifted with increasing ring size (395 → 365 (iii) emission (λ(em)) (494 438 nm for maxima), (iv) fluorescent quantum yields (Φ(F))...

The structures and strain energies of cycloparaphenylenes (CPPs) have been determined by DFT calculation at the B3LYP/6-31G(d) level theory. Fifteen stable conformations [12]CPP were found as local minimum structures. It was also that benzene rings can rotate rather freely room temperature. [n]CPP (n = 6−20) estimated on basis homodesmotic reaction using CPP, biphenyl, p-terphenyl. CPPs higher energy in comparison to cycloparaphenyleneacetylenes (CPPAs).

Crystal clear: The title macrocycle was constructed by a nickel-mediated shotgun macrocyclization. X-ray crystallographic structure of [12]CPP revealed circular incorporating two cyclohexane molecules within the ring. were also found to crystallize into tubular and herringbone structures.

A modular strategy served in the size-selective syntheses of [14]-, [15]-, and [16]cycloparaphenylenes (CPPs). Suzuki–Miyaura coupling was used to assemble a terphenyl-equivalent, L-shaped cis-1,4-diphenylcyclohexane unit linear benzene/biphenyl 3+1+3 or 3+2+3 mode give U-shaped septi- octiphenyl units. The cyclizative dimerization these units subsequent aromatization yielded CPPs. Detailed facts importance specialist readers are published as "Supporting Information". Such documents...

Abstract Nickel-mediated synthesis of [9]cycloparaphenylene ([9]CPP) is described. L-shaped diphenylcyclohexane monomers underwent cyclotrimerization under the influence [Ni(cod)2]/bipy. X-ray crystal-structure analysis and VT NMR thus-formed cyclic trimer confirmed its triangle structure interesting cyclohexane-flipping behavior in solution. Cyclic was converted to [9]CPP by acid-mediated aromatization. The first crystal also

Abstract A new strategy for the non‐chromatographic extraction of metallofullerenes from solutions arc‐processed raw soot is based on size‐selective complexation with cycloparaphenylene (CPP). [11]CPP has a high affinity M x @C 82 ( =1, 2); example, Gd@C can be selectively extracted fullerene mixture by addition [11]CPP. This approach should open opportunities in metallofullerene chemistry, including bulk metallofullerenes.

Den Gürtel enger schnallen: [12]Cycloparaphenylen, das Wandsegment einer Kohlenstoffnanoröhre (siehe Bild), wurde mithilfe wiederholter palladiumkatalysierter Kupplungsreaktionen selektiv synthetisiert. Die Synthese profitiert von der Fähigkeit cis-1,4-Dihydroxycyclohexan-1,4-diyl-Einheit, dem Aufbau Spannungsenergie während Makrocyclisierung entgegenzuwirken. Detailed facts of importance to specialist readers are published as "Supporting Information". Such documents peer-reviewed, but not...

A simple and realistic model for the shortest sidewall segments of chiral single-walled carbon nanotubes (SWNTs) has been designed, one nanorings, cyclo[13]paraphenylene-2,6-naphthylene ([13]CPPN, 1) successfully synthesized. DFT calculations reveal that racemization energy 1 is 8.4 kcal·mol(-1). In addition, some important energetic values, such as barriers strain energies, other nanorings have systematically estimated future molecular design.

The first size-selective synthesis of [9]–[11] and [13]cycloparaphenylenes (CPP) has been achieved by strategically utilizing cis-1,4-diphenylcyclohexane-1,4-diyl as the key terphenyl-convertible L-shaped unit. To access designed triangular or rectangular macrocyclic precursors, we utilized palladium-catalysed C–B/C–Br cross-coupling (Suzuki–Miyaura coupling) and/or nickel-mediated C–Br/C–Br coupling. We also established step-economical routes to [14] [16]CPP using final aromatization steps...

DySc2N@C80 is an endohedral metallofullerene showing single-molecule magnet (SMM) behavior. In this work, we encapsulated DySc2N@C80-SMMs into the internal one-dimensional nanospace of single-walled carbon nanotubes (SWCNTs). Using transmission electron microscopy, "peapod" structures were clearly observed. From magnetic field dependent measurements, showed stepwise hysteresis characteristic SMMs even inside SWCNTs, and coercivity increased from 0.5 to 4 kOe. addition, it slow relaxation...

Kristallklar: Der Titelmakrocyclus [12]CPP wurde durch eine nickelvermittelte Makrocyclisierung aufgebaut. Eine Röntgenstrukturanalyse zeigt, dass das kreisförmige zwei Cyclohexanmoleküle einschließen kann. Die [12]CPP-Moleküle bilden im Kristall überdies Röhren- und Fischgrätstrukturen.

Eine modulare Strategie führte zur größenselektiven Synthese von [14]-, [15]- und [16]Cycloparaphenylenen (CPPs). Suzuki-Miyaura-Kupplung wurde genutzt, um eine L-förmige cis-1,4-Diphenylcyclohexan-Einheit als Terphenyl-Äquivalent lineare Benzol- oder Biphenyl-Einheit im [3+1+3]- [3+2+3]-Modus zu U-förmigen Septi- bzw. Octiphenyl-Einheiten zusammenzufügen. Die cyclisierende Dimerisierung dieser Einheiten nachfolgende Aromatisierung lieferten die CPPs.

A simple method for the synthesis of linear-chain diamond-like nanomaterials, so-called diamantane polymers, is described. This synthetic approach primarily based on a template reaction dihalogen-substituted precursors in hollow cavities carbon nanotubes. Under high vacuum and presence Fe nanocatalyst particles, dehalogenated radical intermediates spontaneously form linear polymer chains within Transmission electron microscopy reveals formation well-aligned polymers. We expect that present...

Abstract A new strategy for the non‐chromatographic extraction of metallofullerenes from solutions arc‐processed raw soot is based on size‐selective complexation with cycloparaphenylene (CPP). [11]CPP has a high affinity M x @C 82 ( =1, 2); example, Gd@C can be selectively extracted fullerene mixture by addition [11]CPP. This approach should open opportunities in metallofullerene chemistry, including bulk metallofullerenes.

Nanotemplated growth of graphene nanoribbons (GNRs) inside carbon nanotubes is a promising mean to fabricate ultrathin ribbons with desired side edge configuration. We report the optical properties GNRs formed in single-wall nanotubes. When coronene used as precursor, extended are grown via high-temperature annealing at 700 °C. Their responses probed through diazonium-based side-wall functionalization, which effectively suppresses excitonic absorption peaks without damaging inner GNRs....

Abstract D 5 h ‐symmetric fullerene C 70 ( ‐C ) is one of the most abundant members family. One longstanding mystery in field chemistry whether capable accommodating a rare‐earth metal atom to form an endohedral metallofullerene M@ , which would be expected show novel electronic properties. The molecular structure La@C remains unresolved since its discovery three decades ago because extremely high instability under ambient conditions and insolubility organic solvents. Herein, we report...

Endohedral metallofullerenes have been extensively studied since the first experimental observation of La@C60 in a laser-vaporized supersonic beam 1985. However, most these studies focused on larger than C60 such as (metal)@C82, and there are no reported purified C60-based monomeric metallofullerenes, except for [Li@C60]+(SbCl6)- salt. Pure (metal)@C60 compounds not obtained because their extremely high chemical reactivity. One route to stabilization is through functionalization. Here we...

Abstract The concise synthesis of sulfur‐enriched graphene for battery applications is reported. direct treatment oxide (GO) with the commercially available Lawesson's reagent produced sulfur‐enriched‐reduced GO (S‐rGO). Various techniques, such as X‐ray photoelectron spectroscopy (XPS), confirmed occurrence both sulfur functionalization and reduction. Also fabricated was a nanohybrid material by using S‐rGO polyoxometalate (POM) cathode‐active rechargeable battery. Transmission electron...

We theoretically investigated the possibility of a carbon nanomaterial with Saturn shape (nano-Saturn) as novel inclusion compound consisting C60 and cyclohexabiphenylene based on total energy calculations using density functional theory. found that nano-Saturn is energetically stable similar or lower to other compounds experimentally synthesized date. Furthermore, formation reaction exothermic an gain about 0.7 eV per molecule.

The photoluminescence of lanthanide ions inside fullerenes is usually very weak due to the quenching effect fullerene cage. In case Er@C82, near-infrared emission from Er3+ ion completely quenched by C82 It remains challenging turn on Er@C82 and other monometallofullerenes. this work, we adopt a covalent modification strategy alter electronic structure cage for sensitizing in metallofullerenes Er@C2n (2n = 72, 76, 82). After with trifluoromethyl, phenyl, or dichlorophenyl groups, erbium...

This study describes the concise exfoliation of multilayer Ti3C2T x MXene containing residual aluminum atoms. Treatment with tetramethylammonium base in a co-solvent tetrahydrofuran and H2O produced single-layer , which was confirmed via atomic force microscopy observations, an electrical conductivity 100+ times that prepared under previously reported conditions. The scanning electron X-ray diffraction measurements showed exfoliated MXenes were reconstructed to assembled large-domain layered...

The first results of high-speed atomic oxygen (AO) irradiation tests for atomically thin single-layer graphene sheets are presented as space environmental tolerance evaluation toward application in astronomy. sample was prepared without a metal coating, and AO were conducted with an averaged velocity ∼6 km/s using laser-detonation beam source assuming low Earth orbit (LEO) case. Raman spectral features examined before after the fluence values 2×1015, 2×1016, 2×1017, 2×1018, 2×1019 atoms/cm2....