Dalton Transactions

doi: 10.1039/C6DT90110Gpmid: N/A

doi: 10.1039/c6dt90110gpmid: N/A

doi: 10.1039/C6DT90111Epmid: N/A

doi: 10.1039/c6dt90111epmid: N/A

doi: 10.1039/c6dt90112cpmid: N/A

doi: 10.1039/C6DT90112Cpmid: N/A

Ye, Ji-Jie; Wu, Chuan-De

doi: 10.1039/c6dt01378cpmid: 27230969

Polyoxometalates (POMs) are a unique class of molecular metal–oxygen clusters with attractive architecture and tunable properties. Due to their strong acidity, redox chemistry, photoactivity, charge distribution and multielectron transformation, POMs have been used as efficient catalysts in a variety of chemical reactions. To meet the requirement of sustainable chemistry, great effort has been focused on immobilization of the active POMs on different solid supports to realize heterogeneous catalysis. This short review summarizes the recent progress on immobilization of POM moieties in crystalline solids with defined crystal structures, including organic–inorganic hybrid materials, POM-based inorganic crystalline solids and POM-encapsulated metal–organic frameworks (POM@MOFs), and their catalytic properties in oxidation, hydrolysis, cyanosilylation, photocatalysis and electrocatalysis. As illustrated in the text, these crystalline solids exhibit interesting catalytic properties, such as high activity, stability and selectivity, and simple recovery and easy recycling, which are much superior to those of the corresponding constituent species in most cases.

Iglesias-Sigüenza, Javier; Izquierdo, Cristina; Díez, Elena; Fernández, Rosario; Lassaletta, José M.

doi: 10.1039/c6dt01700bpmid: 27254732

The benzoannulation of the most common families of aromatic NHCs, imidazol-2-ylidenes and 1,2,4-triazol-3-ylidenes, results in heterobicyclic imidazo[1,5-a]pyridin-3-ylidenes (ImPy's) and [1,2,4]triazolo[4,3-a]pyridin-3-ylidenes (TriPy's), characterized by a bridged N atom. These are versatile platforms that offer multiple possibilities for the modulation of the steric and electronic properties of the carbene ligand and/or organocatalyst, and offer also diverse opportunities for the introduction of several types of chiralities. In this paper the different families of chiral ImPy and TriPy carbenes and their application in asymmetric catalysis will be discussed.

Kühling, Marcel; McDonald, Robert; Liebing, Phil; Hilfert, Liane; Ferguson, Michael J.; Takats, Josef; Edelmann, Frank T.

doi: 10.1039/c6dt01439apmid: 27151931

Well-defined lanthanide polysulfide complexes containing S42− and S52− ligands, the samarium(iii) pentasulfide complex Sm(TpiPr2)(κ1-3,5-iPr2Hpz)(S5) and the tetrasulfide-bridged binuclear ytterbium(iii) complex (μ-S4)[Yb(TpiPr2)(κ1-3,5-iPr2Hpz)(κ2-3,5-iPr2pz)]2 (TpiPr2 = hydro-tris(3,5-diisopropylpyrazolyl)borate), have been synthesized and structurally characterized by single-crystal X-ray diffraction.

Mukhanov, Vladimir A.; Vrel, Dominique; Sokolov, Petr S.; Le Godec, Yann; Solozhenko, Vladimir L.

doi: 10.1039/c6dt00435kpmid: 27157207

Here we propose a new approach to the synthesis of single-phase boron phosphides (BP and B12P2) by mechanochemical reactions between boron phosphate and magnesium/magnesium diboride in the presence of an inert diluent (sodium chloride). The proposed method is characterized by the simplicity of implementation, high efficiency, low cost of the product, and good perspectives for large-scale production.