A highly efficient Pd(OAc)2/guanidine aqueous system for the room temperature Suzuki cross-coupling reaction has been developed. The new water-soluble and air-stable catalyst Pd(OAc)2.(1f)2 from Pd(OAc)2 1,1,3,3-tetramethyl-2-n-butylguanidine (1f) was synthesized characterized by X-ray crystallography. In presence of Pd(OAc)2.(1f)2, coupling arylboronic acids with a wide range aryl halides, including iodides, bromides, even activated chlorides, carried out smoothly in solvent to afford...

Abstract Black phosphorus (BP) nanosheet (NS) is an emerging oxygen evolution reaction (OER) electrocatalyst with both high conductivity and abundant active sites. However, its ultrathin structure suffers instability because of the lone pair electrons exposed at surface, which badly restricts durability for achieving long‐term OER catalysis. Herein, a facile solvothermal reduction route designed to fabricate Co/BP NSs hybrid by in situ growth cobalt nanoparticles on BP NSs. Notably,...

The activity and stability of CdS for visible-light-driven hydrogen evolution could be significantly enhanced by embedding plasmonic Au nanoparticles. plasmon resonance energy field nanoparticles increase the formation rate lifetime e(-)/h(+) pairs in semiconductors.

A novel mechanism of folding-induced spin–orbit coupling enhancement is responsible for the efficient room temperature phosphorescence a thianthrene emitter.

Abstract Developing the single‐molecule white‐light emitters (SMWLEs) at room temperature is very challenging for pure organic metal‐free system, and it even more to achieve high efficiency of SMWLE. Here, alkoxy substituents are tailored 2‐positioned thioxanthone (TX) finely tune molecular packing mode intermolecular interaction between TX units, photoluminescence (PL) (Φ PL ) SMWLE improved successfully from 1.5% 45.0% (TX‐OCH(CH 3 2 ). This simultaneous enhancement dual emission...

Bifunctional asymmetric phase-transfer catalysts bearing multiple hydrogen-bonding donors have rarely been explored. The first quaternary ammonium type of these derived from cinchona alkaloids were readily prepared and found to be highly efficient for nitro-Mannich reactions amidosulfones. Compared with previous reports, very broad substrate generality was observed, both enantiomers the products achieved in high enantio- diastereoselectivity (90–99% ee, 13:1 99:1 dr).

Open AccessCCS ChemistryRESEARCH ARTICLE1 Jul 2021Modulating Room Temperature Phosphorescence by Oxidation of Thianthrene to Achieve Pure Organic Single-Molecule White-Light Emission Yating Wen, Haichao Liu, Shi-Tong Zhang, Guocui Pan, Zhiqiang Yang, Tong Lu, Bao Li, Jungang Cao and Bing Yang Wen State Key Laboratory Supramolecular Structure Materials, College Chemistry, Jilin University, Changchun 130012 , Liu *Corresponding authors: E-mail Address: [email protected] Zhang Pan Lu Li...

Herein, an unusual blue shift in excimer fluorescence with increasing temperature was observed from a crystal discrete π-π anthracene dimer, originating the more temperature-sensitive intermolecular geometry of dimer (e.g., distance) compared to intramolecular monomer, which is confirmed by temperature-dependent single-crystal X-ray diffraction (XRD) measurements.

An efficient enantioselective aza-Henry reaction of aryl α-ketoester-derived ketimines has been realized by using bifunctional thiourea–ammonium salt phase-transfer catalysts, which were derived from quinine. A variety N-Ts investigated, and the corresponding products obtained in high to excellent yields (up 99%) with good enantioselectivities >99% ee).

With the basic understanding and broad application prospects of luminescent materials, emission mechanism unconventional agents has been revealed gradually. Here, we report a non-conjugated biomass material, oat β-glucan (oat-β-Glu), which actually does not emit light in dilute solution but emits significantly when forming aggregates. Inherently visible oat-β-Glu from concentrated solutions solid state could be observed. In addition, have observed room temperature phosphorescence powders, is...

A highly enantioselective aza-Friedel-Crafts reaction of 1H-indoles with isatin-derived N-Cbz-ketimines catalyzed by quinine-derived phase-transfer catalysts was developed. series chiral 3-aminobisindole compounds containing a tetrasubstituted stereocenter were constructed this protocol in high yields (82-91%) and moderate to excellent enantioselectivities (46-94% ee).

We have developed a new base-promoted intermolecular cascade cyclization reaction of substituted 3-aryl(heteroaryl)-3-chloroacrylaldehydes and tetrahydroisoquinolines in one pot. The provides facile practical synthesis pyrrolo[2,1-a]isoquinolines. A number pyrrolo[2,1-a]isoquinolines were synthesized moderate to high yields (up 97%).

A high-yield, highly diastereo- and enantioselective nitro-Mannich reaction of α-aryl nitromethanes with amidosulfones catalyzed by a novel chiral phase-transfer catalyst, bearing multiple H-bonding donors, derived from quinine was developed. variety were investigated; the corresponding products obtained in excellent yields enantioselectivities (up to 99% yield, > 99:1 dr >99% ee). As demonstration synthetic utility, resulting β-nitroamines could be converted meso-symmetric optically pure...

The sol–gel process and electrospinning were used to fabricate a series of silica/Nafion electrospun hybrid products with no aggregation the inorganic component. excellent flexibility as-obtained non-woven membrane single fiber was demonstrated compared brittleness pure silica membrane. difference in wettability between product bulk aqueous sol could be caused by molecular orientation Nafion during process. hydrophobic behaviour, improved mechanical performance good thermal stability made...

Enantioselective Friedel–Crafts alkylation/cyclization of the indole carbocyclic ring with isatylidene malononitriles was performed using a new bifunctional catalyst.

A roller electrospinning technique is combined with sol-gel chemistry to fabricate silica and polymeric materials on conductive nonconductive substrates verify its ability for controlling the long-range periodic structure of final product. According experimental results, formation one-dimensional was dependent electrical conductivity collector substrate. The density seems be related width No effect from substrate system observed. An energy transformation model proposed investigate mechanism...

A fairly general and direct synthesis for the preparation of silica microbelts with a novel stacked structure controllable wetting behavior by using combination sol–gel chemistry electrospinning techniques was explored successfully. The formation mechanism potential application were confirmed.

N,N'-Acetals are sensitive compounds, and the challenging asymmetric synthesis of acyclic N,N'-acetals by general addition amines to ketimines has never been reported so far. In this study, highly enantioselective aryl isatin-derived catalyzed chiral urea derived from quinine was developed. A series new were constructed protocol in high excellent yields (78-99%) enantioselectivities (76-96% ee).

A series of bifunctional asymmetric phase-transfer catalysts containing novel fluorine-containing urea groups derived from cinchona alkaloids have been synthesized and successfully applied in the intramolecular Mannich reaction. The 4-azaindoline products bearing multiple substrates were obtained excellent yield (90−99%), with high enantioselectivity (up to 95%) diastereoselectivity >99:1).

A simple four-input dual-core (thymine & cytosine) logic gate was successfully developed that utilized a succinic imide labelled pyrene probe as the signal responser. Moreover, this molecular could be made into fluorescent paper and applied in field of cryptography.