Carbon quantum dots (CQDs, C-dots or CDs), which are generally small carbon nanoparticles (less than 10 nm in size) with various unique properties, have found wide use more and fields during the last few years. In this feature article, we describe recent progress field of CQDs, focusing on their synthetic methods, size control, modification strategies, photoelectric luminescent mechanism, applications biomedicine, optronics, catalysis sensor issues.

A homochiral porous noninterpenetrating metal-organic framework (MOF), 1, was constructed by linking infinite 1D [Cd(mu-Cl)2]n zigzag chains with axially chiral bipyridine bridging ligands containing orthogonal secondary functional groups. The dihydroxy groups accessible via the large open channels in 1 were utilized to generate a heterogeneous asymmetric catalyst for addition of diethyzinc aromatic aldehydes afford alcohols at up 93% enantiomeric excess (ee). Control experiments dendritic...

Novel heterogenized asymmetric catalysts were synthesized by immobilizing preformed Ru on magnetite nanoparticles via the phosphonate functionality and characterized a variety of techniques, including TEM, magnetization, XRD. These nanoparticle-supported chiral used for enantioselective heterogeneous hydrogenation aromatic ketones with very high enantiomeric excess values up to 98.0%. The immobilized easily recycled magnetic decantation reused 14 times without loss activity...

We report the design of a phosphorescence/fluorescence dual-emissive nanoscale metal–organic framework (NMOF), R-UiO, as an intracellular oxygen (O2) sensor. R-UiO contains Pt(II)-porphyrin ligand O2-sensitive probe and Rhodamine-B isothiocyanate O2-insensitive reference probe. It exhibits good crystallinity, high stability, excellent ratiometric luminescence response to O2 partial pressure. In vitro experiments confirmed applicability biosensor. This work is first NMOF-based sensor should...

Abstract For see ChemInform in Full Text.

Monodentate phosphorus ligands, too, can be effective: Chiral amine derivatives obtained in high enantioselectivities (up to 99.7 % ee) by the asymmetric hydrogenation of enamides presence rhodium complexes chiral spiro ligands (S)-1, first monodentate P that are effective this class reactions.

A family of chiral organometallic triangles based on cis-Pt(PEt3)2 metallocorners and enantiopure atropisomeric bis(alkynyl) bridging ligands (L1-4) has been synthesized characterized by 1H, 13C{1H}, 31P{1H} NMR, UV-vis, circular dichroism (CD) spectroscopies, FAB MALDI-TOF mass spectrometry, microanalysis. Metallocycle 4 which contains three 1,1'-bi-2-naphthol functionalities in combination with Ti(iOPr)4 shown to be an excellent catalyst for highly enantioselective additions diethylzinc...

Even after several years of research, controlled synthesis photoluminescent carbon nanodots (C-dots) still constitutes a major challenge, and investigation their photoluminescence (PL) mechanism remains elusive. Various top-down bottom-up approaches have been reported lately. However, these methods usually suffer from limited control over the factors that dictate PL behaviour fascinating materials. To this end, we discover new approach to prepare C-dots size-tunable single chain polymeric...

On-surface fabrication of covalently interlinked conjugated nanostructures has attracted significant attention, mainly because the high stability and efficient electron transport ability these structures. Here, from interplay scanning tunneling microscopy imaging density functional theory calculations, we report for first time on-surface formation one-dimensional polyphenylene chains through Bergman cyclization followed by radical polymerization on Cu(110). The formed surface were further...

Embedding Pd nanoparticles in carbon thin film-lined SBA-15 nanoreactors provides highly efficient catalysts for heterogeneous cross coupling reactions aqueous media. No leaching or aggregation of was found these after reusing them several times. The film lining further confirmed with small molecular arene probing experiments.

Catalytic building blocks: Chiral porous zirconium phosphonates containing Ru-binap moieties are synthesized by a molecular building-block approach, and characterized variety of techniques. These hybrid solids used for enantioselective heterogeneous asymmetric hydrogenation β-keto esters with ee values up to 95 % (see picture). Ready tunability such approach promises lead useful catalysts. Supporting information this article is available on the WWW under...

A family of chiral diphosphanes with systematically tunable electronic and steric properties have been used in the asymmetric hydrogenation β-aryl ketoesters excellent ee values (up to 99.8 %) by taking advantage remarkable 4,4′-substituent effects on binap. These highly enantioselective Ru catalysts also effectively immobilized room-temperature ionic liquids (RTIL). Supporting information for this article is available WWW under http://www.wiley-vch.de/contents/jc_2002/2004/z53415_s.pdf or...

Conjugated polymer (CP) aggregates with linear/cross-linked structures are widely reported as photocatalysts for hydrogen evolution reaction. For full disclosure of the relationship between photocatalytic performance and structural features CP photocatalysts, homogeneous dispersion these CPs in aqueous medium is necessary, which however difficult to be achieved. Herein, we report several coassembled polymeric dots (Pdots) consisting PEG45-b-PMMA103 various features. We found that Pdots...

Novel monodentate phosphorus ligands containing the 1,1′-spirobiindane backbone have been synthesized and applied in asymmetric rhodium-catalyzed hydrogenation of functionalized olefins, providing excellent enantioselectivities (up to 99.3% ee).

Abstract A family of tunable precatalysts [Pd(( S )‐L*)(NCMe) 2 ](OTf) , where L* is 4,4′‐disubstituted BINAP or SEGPHOS, was synthesized and used for the asymmetric intermolecular hydroamination aniline to vinylarenes with ee values up 85 %, it believed that bulky groups on 4,4′‐positions narrower dihedral angle biaryl moiety are responsible enhancement in these reactions.

A three dimensional porous carbon nanomembrane (CNM), silica-supported CNM (SS-CNM), is developed by formation of a self-assembled monolayer an enediyne compound on the surface mesoporous silica (SBA-15) followed Bergman cyclization and carbonization. The SS-CNM applied as conductive support for electroactive material Co3O4 to fabricate advanced supercapacitors. large fraction clusters (66% total weight) are impregnated in host form regularly packed nanorods with diameters 7 nm. specific...

As emergent nanolights for bioimaging, catalysis, sensors, and photoelectronics, carbon dots (C-dots) have attracted much research attention. However, the practical scalable preparation of C-dots has been less explored, even after various top-down bottom-up approaches being reported recently. To this end, we discover a new approach to prepare by simply unzipping core–shell polymeric nanoparticles, prepared microemulsion polymerization. Uniformly distributed N-doped are pyrolysis PAN@PMMA...

A fluorescence sensing array (or fluorescent electronic nose) is designed on a disposable paper card using 36 sets of soluble conjugated polymeric nanoparticles (SCPNs) as sensors to easily identify wide ranges volatile analytes, including explosives and toxic industrial chemicals (amines pungent acids). 108-dimensional vector obtained from the color change in defined directly treated an index standard chemical library (30 kinds analytes control group). Hierarchical clustering analysis (HCA)...

Electrochemical capacitors (ECs) have traditionally been considered as standing at the opposite end against batteries in energy–power diagram. They charge and discharge faster than but are limited by much lower energy density. By optimizing pore structure of porous electrode materials, performance ECs could overcome this limitation. However to date, no study has addressed complex relationship between texture parameters materials supercapacitance ECs. Using silica-supported carbon...

Highly ordered metal oxide nanorods (MnO2, SnO2, NiO) inside mesoporous silica supported carbon nanomembranes have been applied for electroactive materials to fabricate symmetrical supercapacitors. Maximum specific capacitance of the obtained cells reaches up 964 F g–1 in aqueous electrolyte with energy density 33.5 Wh kg–1 a 1 V voltage window, which are among highest values two electrodes supercapacitor employing similar oxide/carbon materials. This high performance is attributed from...

Porous organic polymers are typically synthesized through coupling reactions between multifunctional monomers. While rich-pore structures can be generated with long building blocks, the synthesis of molecules functional groups large spatial separation is challenging. Herein, we report a strategy using conjugated as and rigid blocks. A hyper-cross-linked polymer was click reaction internal alkyne units in triazido-compound to give an organogel hierarchical porous structure. Benefitting from...

Novel chiral monodentate phosphorus ligands, SIPHOS, were conveniently synthesized from 1,1'-spirobiindane-7,7'-diol. The Rh complexes of SIPHOS can catalyze the hydrogenation alpha-dehydroamino esters in mild conditions, providing alpha-amino acid derivatives up to 99% ee. Enamides and beta-dehydroamino also be hydrogenated good excellent enantioselectivities (up 94% ee, respectively). ligand with smaller alkyl groups on N-atom afforded higher enantioselectivity. X-ray analysis single...

Polymeric nanoparticles were synthesized through Bergman cyclization mediated intramolecular chain collapse. Enediyne moieties incorporated into linear polymers copolymerization or post-polymerization modification. The resulted enediyne containing copolymers then subjected to collapse under ultra-dilute condition applying a continuous addition technique. occurrence of was confirmed with IR, NMR and DSC analysis. characterized GPC, DSC, AFM. Dramatic decreases apparent molecular weights...