In this work, we described a simple and effective synthesis method for preparing well-dispersed Pdgraphene nanohybrids through simultaneous chemical reduction of functionalized graphene oxide and Pd 2+ ions. The structure and physicochemical properties of the resulting nanohybrids were characterized in detail by Fourier transformation infrared spectroscopy, Raman, X-ray photoelectron spectroscopy, high-resolution transmission electron microscopy and scanning electron microscopy. The obtained results indicated that Pd nanoparticles distributed uniformly on the surface of the functionalized graphene when the loading amount of Pd is less than 1.0 wt%. Moreover, the so-formed Pd-FG hybrid material could be well dispersed in water, forming a homogeneous dispersion. This nanohybrid, combining the unique catalytic properties of Pd with the excellent adsorption and electron transfer ability of graphene, exhibited enhanced catalytic activity toward the reduction of 4-nitrophenol by NaBH 4 even under lower Pd loading.

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Catalyst-dependent oxidative cyclization of diynes with pyridine N-oxides is discovered using an amide directing group. Non-polarized and aminated alkyne could be selectively activated by copper and gold, thus leading to...

A new fluorescent probe (probe 1) was developed for recognition of cysteine (Cys) and homocysteine (Hcy). Probe 1 exhibited a large absorption peak blue-shift (107 nm) as well as enhanced fluorescence responses to Cys/Hcy based on cyclization of thiol containing amino acids with aldehydes, inhibiting the C = N isomerization-induced quenching process by an intramolecular hydrogen bond. The detection mechanism was proved by (1)H NMR and mass spectrometry analysis.

Naphthalimide-based fluorescent probes 1 and 2 were synthesized, and were designed to form probe-Hg complexes through Hg(2+) ions coordinated to the amide group and imidazole group. They showed high sensitivity and were selective 'naked-eye' chemosensors for Hg(2+) in phosphate buffer. The fluorescence of compounds 1 and 2 could be quenched up to 90% by the addition of Hg(2+) . Reversible probes can detect Hg(2+) ions over a wide pH range (7.0-10.0). Copyright © 2015 John Wiley & Sons, Ltd.