The colorimetric fiber sensor reported in this study shows excellent selectivity and sensitivity towards Hg²⁺ over other common metal ions can be repeatedly used more than 50 times.

Redistribution of primary silanes through C–Si and Si–H bond cleavage reformation provides a straightforward synthesis secondary silanes, but the poor selectivity low efficiency severely hinders application this synthetic protocol. Here, we show that newly synthesized divalent ytterbium alkyl complex exhibits unprecedentedly high catalytic activity toward selective redistribution arylsilanes to arylsilanes. More significantly, also effectively catalyzes cross-coupling between...

ABSTRACT Molecularly imprinted polymer (MIP) for selective extraction of p ‐hydroxybenzoic acid ( ‐HB) was synthesized by suspension polymerization using ‐HB as template, 4‐vinyl pyridine functional monomer and ethylene glycol dimethacrylate crosslinker. As characterized scanning electron microscopy, the MIP particles are spherical, with size ranging from 1 to 8 μm. Compared non‐imprinted (NIP), shows higher binding capacity toward ‐HB: maximum being 8.07 μmol g −1 over 3.88 NIP. The...

A simple and effective route to improve the fluorescence of carbon dots is reported. weak fluorescent solution was obtained by a diminution step obtain tiny particles from bagasse-based carbonaceous blocks. This subjected hydrothermal treatment under alkaline conditions its performance. The luminescence found be improved more than 20-fold after treatment. ultraviolet absorption surface structure were also significantly changed. process shown involves hydrolysis, isomerization, dehydration,...

The synthesis and catalytic applications of trivalent rare-earth metal alkyl complexes have been well developed, but the chemistry divalent lagged much behind. Herein, we report synthesis, structure, a samarium(II) monoalkyl complex supported by β-diketiminato-based tetradentate ligand, [LSmCH(SiMe3 )2 ] (L=[MeC(NDipp)CHC(Me)NCH2 CH2 N(Me)CH2 NMe2 ]- , Dipp=2,6-(iPr)2 C6 H3 ). This is synthesized salt metathesis reaction samarium iodide [LSm(μ-I)]2 KCH(SiMe3 in 63 % yield. Its structure...

In principle, catalytic dehydrogenative silylation and mono/dihydrosilylation tandem reactions of terminal alkynes with hydrosilanes provide gem-disilylated alkenes or gem-trisilylated alkanes, but very little progress has been made. Herein, we report organocalcium-complex-catalyzed in one pot, which produce moderate yields alkanes high yields. We also briefly demonstrate that the synthesized can be easily transformed into other organosilanes.

Polycarbosilanes with SiH2 units in the main chain may undergo diverse reactions to access a family of functionalized polymers enhanced added values. However, preparation such has been hampered by uncontrollable side involving Si–H bonds under transition-metal-catalyzed conditions. We described here first selective bis-hydrosilylation dienes bis(hydrosilanes) enabled rare-earth-metal catalysts yield linear polycarbosilanes chain. The could halogenation, Si–O coupling, and hydrosilylation...

The solvent extraction, complexing ability, and basicity of tetradentate N-donor 2,9-bis(5,5,8,8-tetramethyl-5,6,7,8-tetrahydro-1,2,4-benzotriazin-3-yl)-1,10-phenanthroline (CyMe4-BT- Phen) its derivatives functionalized by Br, hydroxyphenyl, nitryl were discussed compared. It was demonstrated that four BTPhen ligands are able to selectively extract Am(lll) over Eu(lll). notable the distribution ratio 5-nitryl-CyMe4-BTPhen for Eu(lll) suppressed under 0.02, which much lower compared DEu(lll)...

Tea is a popular drink around the world. It also one of sources metal intake. The objectives this study were to assess chromium (Cr) intake from green, oolong, black and Pu-erh tea. In total, 128 Chinese made teas analysed concentration differences among four types tea explored. Black contained highest total Cr, which varied between 0.63 17.60 mg/kg. lowest content was found in green samples, 0.26 1.30 Cr(III) Cr(VI) higher than other Cr(III), Cr different infusions analysed. results suggest...

A novel formal [3+2] and [4+2] annulation of ketoxime acetates ynals for the synthesis pyrroles isoquinolines has been developed. By simply switching catalyst solvent, reaction proceeds via two pathways. The reactions are achieved under mild conditions with broad substrate scope excellent regioselectivity.

The polyamide reverse osmosis (RO) membranes were prepared through interfacial polymerization of m-phenylenediamine (MPD) and trimesoyl chloride (TMC). use dimethyl sulfoxide (DMSO) glycerol as additives for the formation thin-film composite (TFC) was investigated. We studied effect DMSO addition on membrane property RO performance. Microscopic morphology examined by atomic force microscopy scanning electron microscopy. surface hydrophilicity characterized basis water contact angle...

An efficient nano-Cu₂O-catalyzed CO-free reaction toward phthalimides from 2-halobenzoic acids, TMSCN and amines “on water”.

A chiral cationic low-molecular-weight amphiphile, derived from L-phenylalanine, was synthesized. It can gel benzene, toluene and chlorobenzene cause viscous liquids in deionized water tetrahydrofuran. Ethenylene-silica hollow nanospheres with a single-layer of pore channels their shells were prepared using the self-assemblies this amphiphile as templates. Small angle X-ray diffraction pattern indicated that did not arrange high degree order. The formation hierarchical porous structure...

Abstract Indolizine is one of the important nitrogen containing heterocycles due to their wide range bioactivities. A convenient and efficient intermolecular cyclization reaction catalyzed by I 2 was developed, affording 3‐acylated indolizines in good excellent yields. 2‐Pyridylacetonitrile, 2‐pyridylacetone 2‐pyridylacetamides were all compatible, water considered as source carbonyl oxygen products. Furthermore, conjugated enynenitriles afforded from 2‐pyridylacetonitrile with ynals high

Abstract Immunoassay methods, notably enzyme‐linked immunosorbent assays (ELISAs), renowned for their signal amplification capabilities, are extensively employed in scientific research and clinical diagnostics. However, the instability of enzymes sensitivity to cellular environments present significant challenges broad application ELISA living cells. In this work, we a bioorthogonal (poly)catalysis‐linked assay (BCLISA) designed detection cell membrane antigens, which involves coupling...

Abstract Immunoassay methods, notably enzyme‐linked immunosorbent assays (ELISAs), renowned for their signal amplification capabilities, are extensively employed in scientific research and clinical diagnostics. However, the instability of enzymes sensitivity to cellular environments present significant challenges broad application ELISA living cells. In this work, we a bioorthogonal (poly)catalysis‐linked assay (BCLISA) designed detection cell membrane antigens, which involves coupling...

In this paper, the effects of extraction temperature, pressure and dosage entrainer on flavonoids yield were studied. The optimal process determined by response surface method was temperature as 48.52°, 40MPa, 36.13mL, theoretical predictive 0.791%, actual verified 0.793%, there an interaction between entrainer. optimum orthogonal design 50°, 37.5mL, 0.779%. Although two methods obtained similar best processes, could provide more accurate information, final also highest, which worth promoting.

An environmentally friendly pretreatment for mild steel, based on silane and zirconium, was developed with the aim of replacing conventional chromating phosphating. Electrochemical polarization salt spray testing were employed to evaluate anticorrosive ability silane-zirconium film. The surface morphology studied by scanning electron microscopy, adhesion strength epoxy coating steel evaluated using a pulloff test. test results demonstrated that corrosion protection performance treated...