As imple and efficient synthesis of NBN-doped conjugated polycyclic aromatic hydrocarbons (sucha sd iazaborinines) has been accomplished by ac atalyst-free intermolecular dehydration reaction at room temperature between boronic acid and diamine moieties with yields up to 99 %. Polycyclic aromatic hydrocarbons with as ix-membered NBN ring are an ew class of aggregation-induced emissive luminogens.E xtremely sensitive detection of ppb levels of TNT by phenyl naphthodiazaborinine is straightforward. Visual detection of TNT is illustrated by fabrication of TNT test strips, which can detect as little as 100 ng of TNT powder.This simple and sensitive detection of TNT has potential applications in the area of public safety and security against terrorist activities.Doping of polycyclica romatic hydrocarbons (PAHs) with boron-nitrogen units,t hat is,i soelectronic and isosteric replacement of aC =Cb ond with aB ÀNb ond (Scheme 1), has emerged as av ersatile strategy for the preparation of novel hybrid PA Hs with unusual and attractive optical, electronic,a nd chemical properties that are absent from their C=Cc ongeners. [1] Them olecular design of boronnitrogen-doped PA Hs therefore expands the structure and functionality library of p-systems,and such chemistry is highly desirable in the development of useful materials. [2] For example,since the pioneering work on BN doped p-systems, namely azaborinines,b yD ewar and White in the 1960s, considerable research effort has been devoted by,for example Ashe,L iu, Braunschweig,S chäfer,a nd Jäkle [3] to the synthesis,p roperties,a nd reactivity of azaborinines.S ince Weberspioneering work on NBN-doped compounds,specifically diazaborinines,t here have been numerous investigations of their synthesis,o na ccount of their potential applications as drugs and as reagents that can be used in the Suzuki-Mayaura reaction. [4] Although considerable progress has been made in boron-nitrogen doped p-systems,t he currently available preparative methods suffer from the need for rigorous reaction conditions including the requirement for conditions which are air-and/or moisture-free,multiple steps and unsatisfactory total yield. Finding as imple and mild strategy with which to synthesize boron-nitrogen-doped PA Hs is therefore significant and highly desirable.Boron-containing p-systems have attracted considerable research attention since the 1960s due to their desirable optical, electronic, and sensory properties. [5] With the presence of an empty porbital of the boron center in p-systems, such compounds are luminogens and are widely utilized as such. [6] Tr aditional luminogens fluoresce strongly in dilute solution but are subject to aggregation-caused quenching (ACQ) [7] and the luminogens are quenched at higher concentrations or in aggregation states.I n2 001, Tang described the aggregation-induced emission (AIE) of luminogens (AIEgens), [8] which fluoresce weakly when dissolved, but emit strongly when aggregated. As an important class of luminogens,b oron containing p-systems featuring AIE,...
Uniform AgCl nanocubes with an average edge length of 85 nm have been prepared by a facile reverse micelle method. Partially reducing the as-produced AgCl nanocubes enables us to achieve a class of sunlight-driven plasmonic AgCl : Ag nanophotocatalysts. The optical absorption spectrum of the thusachieved nanophotocatalyst exhibits strong absorption in the visible region due to surface plasmon resonance (SPR) of silver nanoparticles. Under sunlight illumination the hybrid AgCl : Ag nanoparticles exhibit high activity and durability towards decomposition of organic pollutant, e.g., methyl orange. The catalyst can be reused for 19 times without loss of activity. The possible photocatalytic mechanism is discussed, which indicates that metallic silver nanograins (or nanoparticles) play a critical role in enhancing photocatalytic performance and stabilizing the photocatalyst. These features mean the present nanophotocatalyst can be applied in environmental remediation, and waste water disinfection.
The Barbier reaction, a widely utilized reaction for carbon–carbon bond formation, has played important roles in modern organic chemistry for more than a century. Here, we show its successful introduction to polymer chemistry. Through one-pot Barbier polyaddition (both A2+B2 type and AB type) of monomers containing an organic halide and a benzoyl group, a series of phenylmethanol group containing polymers, including polymonophenylmethanol (PMPM), polydiphenylmethanol (PDPM), and polytriphenylmethanol (PTPM), have been synthesized. Para-PTPM exhibits interesting aggregation-induced emission, tunable thermo-responsive over a wide temperature range, sensory, luminescence enhancement of fluorescent dye in solid-state and processing properties. This significantly expands the libraries of monomer and polymer, and opens up an avenue for the design and application of functional polymer materials.
Three novel diquaternary ammonium salts with alkanediyl spacers of varying chain length were synthesized, and their corrosion inhibition effects on N80 steel in 15 wt % HCl solution were studied by weight loss measurement, electrochemical polarization, electrochemical impedance spectroscopy (EIS), scanning electron microscope (SEM), and energy dispersive X-ray spectroscopy (EDX). The results indicated that the inhibition efficiency increased with the inhibitor concentration and the length of hydrophobic spacer of the inhibitor. At 90 °C, the inhibition efficiency of diquaternary ammonium salt N,N′-octane-1,8-diyl-bisquinolinium dibromide reached about 91% at the inhibitor concentration of 0.01 mol/L. Potentiodynamic polarization curves indicated that all synthesized compounds acted as mixed-type inhibitors. The inhibition mechanism involved the formation of an inhibitor protective layer on the N80 steel surface by a Langmuir-type adsorption process. The presence of Br and N in chemical composition detected by EDX confirmed the adsorption of inhibitors on the N80 steel surface.
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