A cycloparaphenylene-based molecular lemniscate (CPPL) was obtained in a short synthesis involving masked p-phenylene equivalents. The strained figure-eight geometry of CPPL is sustained by the incorporated 9,9′-bicarbazole subunit, which also acts as stereogenic element. shape distorted [16]cycloparaphenylene nanohoop embedded accurately approximated with Booth lemniscate. structure CPPL, investigated using NMR and Raman spectroscopic methods, revealed strain-dependent features, consistent...

In this study, we reported a simple and efficient route for the one-pot sonochemical synthesis of substituted 3-pyrrolin-2-ones by citric acid as an additive.

Abstract Octulene, the higher homologue of kekulene and septulene, was synthesized using fold‐in method. This new hydrocarbon macrocycle contains a large 24‐membered inner circuit, which is peripherally fused to 24 benzene rings. Such an arrangement produces considerable hyperbolic distortion π‐conjugated surface. The consequences in octulene were explored photophysical methods, revealed reduced electronic band gap greater flexibility π system. Octulene functional cavity with diameter larger...

Chiral heteroaromatic propellers based on radially π-extended hexapyrrolohexaazacoronenes were obtained in a concise synthesis from suitably functionalized donor-acceptor monopyrroles. To overcome steric hindrance, new cyclodehydrogenation method was developed, and it uses bromine electrophiles as oxidative coupling agents instead of the commonly employed high-potential oxidants. The reaction offers high yields propeller-shaped targets, even for electron-deficient precursors, shows...

In the present work, based on a convergent protocol, we synthesized proline-Cu complex 1,3,5-triazine coated Fe3O4 magnetic nanoparticles as green and recyclable nanocatalyst by an inexpensive simple procedure. Then, fully specified Fourier transform infrared spectroscopy (FT-IR), pursued field emission scanning electron microscopy (FESEM), vibrating sample magnetometry (VSM), powder X-ray diffraction (PXRD), energy dispersive analysis (EDX), thermogravimetric (TGA), Brunauer–Emmet–Teller...

Diradicaloid helicenes constructed formally by non-benzenoid double π-extension of phenanthrene were synthesized a common strategy involving electrophilic benzannulation. Steric effects in the second benzannulation step led to considerable structural diversity among products, yielding symmetrical dinor[7]helicene 1 and two isomeric unsymmetrical 2 3, containing nor[5]helicene [4]helicene fragment, respectively, addition nor[6]helicene motif. Geometries, configurational dynamics, electronic...

Synthesis and characterization of a heterogeneous catalyst based on silica supported Zn( ii )–hydrazone complex its activity in the chemical CO 2 fixation reaction have been reported.

ABSTRACT A novel mononuclear Cr(III) coordination compound, [Cr(HL)(N 3 ) 2 ], was synthesized by the reaction of CrCl ·6H O and NaN with Schiff base ligand (H L‐Cl). The ] were characterized spectroscopic methods. Single‐crystal X‐ray analysis also accomplished to confirm structure compound. According results analysis, this compound crystallizes in triclinic system P‐1 space group CrN 6 environment around ion can be described as a distorted octahedral geometry. catalytic activity...

In der Kürze liegt die Würze: Die nichtaromatische freie Base 6,16-Dimesityl-11-phenylsubpyriporphyrin, verwandt mit Triphyrin(1.1.1), enthält eine dreizentrige Wasserstoffbrücke. Laut Röntgenstrukturanalyse hat diese Verbindung den kleinsten bekannten N⋅⋅⋅N-Abstand (2.370 Å) zweier N-Atome, an einer Wasserstoffbrücke beteiligt sind. Das Molekül fungiert auch als Ligand, wie Bildung eines Borkomplexes belegt. Supporting information for this article is available on the WWW under...

The X-ray single crystal structure determination of Lu2O3 sesquioxide and polycrystalline transparent ceramic fabricated by the unconventional spark plasma sintering (SPS) method is presented for first time. High quality crystals samples were obtained using both micropulling-down (μ-PD) laser heated pedestal growth (LHPG) technique. SPS promising obtaining high-density ceramics with fine grains at a relatively low temperature within short holding structural characterizations helped to...

Nonclassical nanotube end-caps have been constructed from strain-free heterocyclic precursors using a one-step synthetic procedure, involving multiple nickel-mediated Ullmann couplings. These systems consist of tubular macrocyclic sections that are tightly capped on one side with bridging benzene ring, forming deep, chemically accessible cavities. The characterized by exceptionally high internal strain energies reaching 144 kcal/mol. optical absorption and emission properties these molecules...

Abstract A hexapyrrolohexaazacoronene derivative containing 37 fused rings, the largest such system to date, was obtained from a naphthalenomonoimide–pyrrole hybrid in concise and efficient synthesis. This large heterocycle is electron‐deficient shows extended redox activity, spanning at least 13 oxidation levels, but otherwise chemically stable. Radial expansion of π creates chromophore characterized by strong fluorescence solvatochromism neutral state, near‐infrared absorption charged...

A family of azacoronenes containing up to two saturated bridges at the periphery was synthesized from substituted hexapyrrolylbenzenes using a two-step condensation–aromatization procedure. The introduction peripheral provides access nonplanar, sterically crowded systems that display complex reactivity patterns, involving stereospecific aromatization and nucleophile additions. Despite interrupted conjugation on periphery, new have easily accessible higher oxidation levels, quadruply charged...

A family of bandgap-tunable pyrroles structurally related to rylene dyes was computationally designed and prepared using robust, easily scalable chemistry. These show highly variable fluorescence properties can be used as building blocks for the synthesis electron-deficient oligopyrroles. The latter application is demonstrated through development π-extended porphyrins containing naphthalenediamide or naphthalenediimide units. new macrocycles exhibit simultaneously tunable visible near-IR...

Nine dioxidomolybdenum(VI) complexes were synthesized through the reactions of MoO 3 with tridentate hydrazone Schiff base ligands obtained from aromatic acid hydrazides (3‐hydroxy‐2‐naphthoic hydrazide, 4‐pyridinecarboxylic hydrazide and 2‐furoic hydrazide) ortho ‐hydroxy aldehyde derivatives (5‐iodo‐2‐hydroxybenzaldehyde, 2‐hydroxy‐1‐naphthaldehyde 2‐hydroxy‐3‐methoxybenzaldehyde). All characterized by elemental analysis spectroscopic methods. The structures seven further elucidated...

In this study the solvent free catalytic oxidation of olefins by a new silica supported hydrazone-dioxidotungsten( vi ) coordination compound is investigated.

Electronic and steric effects are known to greatly influence the structure, characteristics reactivity of organic compounds. A typical π bond is weakened by oxidation (corresponding removal electrons from bonding orbitals), reduction (through addition antibonding orbitals) unpairing electrons, such as in triplet state. Here we describe tetrafluorenofulvalene (TFF), a twisted, open-shell alkene for which these general rules do not hold. Through synthesis, experimental characterization...

(CH3NH3)3Sb2Cl9 single crystals are grown which appear to be isomorphous with Cs3Sb2Cl9 of β-modification. They characterized by the space group Pmcn lattice constants: a = 0.7920(5), b 1.3334(11), and c 1.966(2) nm. In crystal one can distinguish poly-anionic (Sb2Cl9)3- stacks directed along a-axis three crystallographically inequivalent CH3NH cations. The DSC, dielectric, PMR studies reveal structural phase transition at 208 K is related freezing rotational motion Kristalle von...

The synthesis and magnetic properties of 13 new homo- heterometallic Co(II) complexes containing the artificial amino acid 2-amino-isobutyric acid, aibH, are reported: [CoII4(aib)3(aibH)3(NO3)](NO3)4·2.8CH3OH·0.2H2O (1·2.8CH3OH·0.2H2O), {Na2[CoII2(aib)2(N3)4(CH3OH)4]}n (2), [CoII6LaIII(aib)6(OH)3(NO3)2(H2O)4(CH3CN)2]·0.5[La(NO3)6]·0.75(ClO4)·1.75(NO3)·3.2CH3CN·5.9H2O (3·3.2CH3CN·5.9H2O),...

Unsymmetrical Schiff base obtained by the condensation reaction of (1R,2R)(−)cyclohexanediamine with 2-hydroxybenzaldehyde and 2-hydroxynaphthaldehyde was used as a ligand for copper(II) nickel(II). The complexes were characterized circular dichroism (CD), UV-VIS, fluorescence, IR 1H (NOE diff), NOESY 13C NMR (ligand) spectra. X-ray crystal structures solved (1R,2R)(−)chxn(salH)(naftalH) Cu(II)(1R,2R)(−)chxn(sal)(naftal) revealed tetrahedral distortion coordination sphere in solid phase....

Two ruthenium(III) complexes composed of 5,7-ditertbutyl-1,2,4-triazolo[1,5-a]pyrimidine (dbtp) ligands were prepared and structurally characterized by X-ray crystallography, IR, UV-Vis, EPR spectroscopies cyclic voltammetry (CV). The crystal structures trans-[RuCl(3)(H(2)O)(dbtp)(2)] 1 mer-[RuCl(3)(dbtp)(3)]·0.815OCMe(2) 2 showed slightly distorted octahedral geometries with two or three monodentate dbtp bound in a head-to-head orientation. In both complexes, the heterocyclic to ion through...