A rigid, inherently chiral bilayer nanographene has been synthesized as both the racemate and enantioenriched M isomer (with 93 % ee) in three steps from established helicenes. This folded is composed of two hexa-peri-hexabenzocoronene layers fused to a [10]helicene, with an interlayer distance 3.6 Å determined by X-ray crystallography. The rigidity helicene linker forces adopt nearly aligned AA-stacked conformation, rarely observed few-layer graphene. By combining advantages nanographenes...

A geometrically selective bottom-up synthesis of curved nanographenes is described. The synthetic methodology used involves the extension π-system positively corannulene by a [4+2] cycloaddition reaction followed cyclodehydrogenation (Scholl oxidation). By selecting conditions for Scholl oxidation, formation seven-membered ring that also confers negative curvature to resulting nanographene can be activated, offering two topologically distinct, from common precursor. Additionally,...

Helical bilayer nanographenes (HBNGs) are chiral π-extended aromatic compounds consisting of two π-π stacked hexabenzocoronenes (HBCs) joined by a helicene, thus resembling van der Waals layered 2D materials. Herein, we compare [9]HBNG, [10]HBNG, and [11]HBNG helical bilayers endowed with [9], [10], [11]helicenes embedded in their structure, respectively. Interestingly, the helicene length defines overlapping degree between HBCs (number benzene rings involved interactions layers), being 26,...

The combined advantages of layered double-hydroxide catalysts and rare-earth compounds are found in the hydroxides [R4(OH)10(H2O)4]nAn (R=Y, Dy, Ho, Yb; A=organic anion). These crystalline materials (see structure) comprise rigid organic anions (balls sticks) intercalated between inorganic layers (polyhedra). They selective heterogeneous for hydrodesulfurization sulfide oxidation.

Two novel homo and hetero three-dimensional nanographenes, NG1 NG2, featuring a cyclooctatetraene core are designed, synthesized, characterized. A concise efficient bottom-up methodology was employed during which 24 new carbon-carbon bonds were formed. By means of Scholl reaction nanographenes with 53 fused rings realized, exhibited good solubility in common organic solvents. The resulting saddle-like structures NG2 electron-rich show chemical electrochemical stability. Their molecular fully...

Abstract The introduction and precise control of stereogenic elements in chemical structures is typically a challenging task. Most asymmetric methods require the presence heteroatom starting substrates acting as an anchor point for successful transfer chiral information. For this reason, compounds comprising only carbon atoms, such optically active molecular nanographenes, are usually obtained racemates, isolated by chromatographic separation. Here, we report enantioselective strategy that...

The 3D polymeric terephthalate of scandium has been synthesized and its structure solved by single-crystal XRD. It was obtained as a single phase characterized tested hydrogen nitrogen adsorbent heterogeneous catalyst redox agent in the oxidation sulfides. compound shows BET area 721 m2 g-1 with high CBET = 7000. chemical thermal stability excellent sorption properties make this useful material for storage.

Abstract A rigid, inherently chiral bilayer nanographene has been synthesized as both the racemate and enantioenriched M isomer (with 93 % ee ) in three steps from established helicenes. This folded is composed of two hexa‐ peri ‐hexabenzocoronene layers fused to a [10]helicene, with an interlayer distance 3.6 Å determined by X‐ray crystallography. The rigidity helicene linker forces adopt nearly aligned AA‐stacked conformation, rarely observed few‐layer graphene. By combining advantages...

Abstract Three new star‐shaped hole‐transporting materials (HTMs) incorporating benzotripyrrole, benzotrifuran, and benzotriselenophene central cores endowed with three‐armed triphenylamine moieties ( BTP‐1 , BTF‐1 BTSe‐1 respectively) are designed, synthesized, implemented in perovskite solar cells (PSCs). The impact that the heteroatom‐containing scaffold has on electrochemical photophysical properties, as well photovoltaic performance, is systematically investigated compared their...

An organocatalytic strategy for the synthesis of tetrasubstituted pyrrolidines with monoactivated azomethine ylides in high enantiomeric excess and excellent exo/endo selectivity is presented. The key to success intramolecular activation via hydrogen bonding through an o-hydroxy group, which allows dipolar cycloaddition take place presence bearing only one activating group. bond ylide intermolecular catalyst have been demonstrated by DFT calculations mechanistic proofs be crucial reaction proceed.

A benchtop solution-phase synthesis of molecular nanographenes composed two orthogonal dibenzo[fg,ij]phenanthro[9,10,1,2,3-pqrst]pentaphene (DBPP) moieties covalently connected through a tetrafluorobenzene ring is described. The helical arrangement these three linked fragments leads to the existence chiral axis which gives rise racemic mixture, even with being symmetrically substituted. X-ray diffraction studies show that both enantiomers cocrystallize in single crystal, and mixture can be...

New 3D polymeric succinates of rare-earths have been synthesised: [Sc2(C4H4O4)2.5(OH)], [Y2(C4H4O4)3(H2O)2]·H2O, [La2(C4H4O4)3(H2O)2]·H2O, and their structures solved by single crystal XRD. They were obtained as phases, characterised tested heterogeneous catalysts Lewis acids in the acetalization aldehydes redox agents oxidation sulfides showing them to be effective selective catalysts, easy recover reusable. The scandium, yttrium lanthanum oxides also same catalytic reactions prove effect...

Three new 3D metal-organic frameworks (MOFs), namely scandium and yttrium naphthalenedisulfonates (nds), have been obtained their crystal structures determined by single X-ray diffraction. The 1,5- 2,6-nds compounds (RPF-12 RPF-13, respectively), both with the formula [Sc2(nds)(OH)4]n, naphthalenedisulfonate [Y(1,5-nds)(OH)(H2O)]n, RPF-14, were synthesised under hydrothermal conditions. can be described as pillared layered motifs where sheets of sulfonate bridged polyhedra are connected...

The potential of structurally new ferrocene-functionalized guanidines as redox-active precursors for the synthesis heterometallic platinum(II)–guanidine complexes with anticancer activity was studied. To this end, an atom-economical catalytic approach followed by using ZnEt2 to catalyze addition aminoferrocene and 4-ferrocenylaniline N,N′-diisopropylcarbodiimide. Furthermore, reaction a platinum(II) source newly obtained Fc–N═C(NHiPr)2 (3) Fc(1,4-C6H4)–N═C(NHiPr)2 (4) provided access...

Direct reactions under ambient conditions between CuX (X = Br, I) and thiobenzamide (TBA) were carried out at different ratios, giving rise to the formation of a series one-dimensional (1D) coordination polymers, (CPs) [CuI(TBA)]n (1), [Cu3I3(TBA)2]n (4), [CuBr(TBA)]n (5), as well two molecular complexes, [CuI(TBA)3] (2) [Cu2I2(TBA)4]·2MeCN (3). Recrystallization 1 5 yielded isostructural 1D CP solvated species, [CuI(TBA)·S]n]n (1·S; S tetrahydrofuran, acetone, methanol) [CuBr(TBA)·S]n (5·S;...

The preparation and characterization of the new 3,5-diacetyl-1,2,4-triazol bis(4-cyclohexyl thiosemicarbazone) ligand, H55L11, is described. Treatment H55L11 with K2PtCl4 gave dinuclear complex [Pt(H3L1)]2, 1, but using MCl2(PPh3)2 where M = Pd or Pt, mononuclear complexes 2 3, general formula [M(H3L1)PPh3], were obtained. Subsequent reaction [Pd(H3L1)PPh3] PdCl2(PPh3)2 yielded a [(PPh3)Pd(H2L1)PdCl], 4. All compounds have been characterized by elemental analysis FAB+ spectrometry IR NMR...

Abstract Solvothermal reactions between copper(I) halides and 4‐mercaptophenol give rise to the formation of three coordination polymers with general formula [Cu 3 X(HT) 2 ] n (X=Cl, 1 ; Br, I, ). The structures these have been determined by X‐ray diffraction at both room‐ low temperature (110 K), showing a shortening in Cu−S, Cu−X Cu−Cu bond lengths temperatures. are isostructural, consisting layers which halogen ligands act as μ ‐bridges joining two Cu1 one Cu2 atoms whereas iodine is 4...

The bottom-up synthesis of 3D tetrakis(hexa-peri-hexabenzocoronenyl)methane, "tetrahedraphene", is reported. This molecular nanographene constituted by four hexa-peri-hexabenzocoronene (HBC) units attached to a central sp3 carbon atom, shows highly symmetric arrangement the HBC disposed in apex tetrahedron. X-ray crystal structure reveals tetrahedral symmetry molecule and packing achieved mostly CH⋅⋅⋅π interactions since interstitial solvent molecules prevent π⋅⋅⋅π interactions. In solution,...

Two subphthalocyanine-C

We present a structurally flexible copper-iodide-pyridine-based coordination polymer showing drastic variations in its electrical conductivity driven by temperature and sorption of acetic acid molecules. The dramatic effect on the enables fabrication simple robust device for gas detection. X-ray diffraction studies DFT calculations allow rationalisation these observations.

Abstract Scholl oxidation has become an essential reaction in the bottom‐up synthesis of molecular nanographenes. Herein, we describe a controlled by electronic effects on starting substrate ( 1 , b ). Anthracene‐based polyphenylenes lead to spironanographenes under conditions. In contrast, electron‐deficient anthracene affords helically arranged nanographene formed two orthogonal dibenzo[fg,ij]phenanthro‐[9,10,1,2,3‐pqrst]pentaphene (DBPP) moieties linked through octafluoroanthracene core....

The rational design of electroluminescent compounds has been recognized as a promising strategy to maximize the efficiency electronic devices. In this work, we analyze impact substitution n-alkyl and n-alkoxy side chains by bulkier groups (tert-butyl tert-butoxy) on photophysics two model fluorophores 1,3,5-tris(styryl)benzene 1,2,4,5-tetra(styryl)benzene. We found that bulky have significant contribution vibrational normal modes associated with non-radiative deactivation....

Abstract Previous studies on bimetallic paddlewheel compounds have established a direct correlation between metal–metal distance and ligand torsion angles, leading to the rule that higher results in longer metal‐metal bond distances. Here, new discovery based diarylformamidinate Ru₂⁵⁺ [Ru 2 Cl(DArF) 4 ] show an opposite behavior is reported: torsions lead shorter This challenges assumption internal rotation solely impacts δ bond. By combining experimental theoretical techniques, it...