The growth process and activity of naphthalenic species during methanol conversion within the industrially important catalyst H-SAPO-34 is described using ab initio simulations on a large finite cluster model. The cover shows that addition of methyl groups is feasible, leading to larger hydrocarbon pool compounds. An actual side-chain methylation turns out to be a very slow step, and the involved species should be regarded as deactivated coke precursors challenging the steric limitations of the catalytic pore. For more details see the Full Paper by K. Hemelsoet, V.

Van Speybroeck et al. On • • • • • •. The working principle of a new type of probe—an allosteric molecular beacon (orange ribbon)—is depicted. The probe can bind to streptavidin (sphere with colored dots) only when it is activated by its target (green ribbon). When streptavidin microbeads are used, target-bound probes will gather on the surface of microbeads and can be easily separated from free probes and other interference species for sensitive target detection in complex biological samples.

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For more details see the Communication by Chaoyong Yang et al. David Laser Scanner 3 Keygen Mac more. On • • • • • •. 2,4-Dienals are shown to undergo highly stereoselective Diels–Alder reactions with olefinic azlactones by asymmetric trienamine catalysis. The obtained cycloadducts are easily transformed into the corresponding cyclic, -disubstituted N-protected amino acid methyl esters under mild reaction conditions. Furthermore, it is demonstrated that in situ ligation of the crude cycloaddition products with amino acid hydrochloride salts leads to the formation of non-natural dipeptide motifs in a one-pot fashion.

• • • • • • •. From fries to fuel! Reduction of CO 2 from a waste combustion product into a hydrocarbon fuel using solar energy is one of the best strategies to manage global warming and energy shortage. Homogeneously hybrid TiO 2/ZnO mesoporous “french fries” (MFFs) were synthesized by a facile furfural alcohol-derived polymerization–oxidation route (see scheme). The unusual hybrid mesoporous structure of the TiO 2/ZnO MFFs enhances the photocatalytic activity toward conversion of CO 2 into hydrocarbon fuel (CH 4) in the presence of water vapor. • • • • • • • Cycloaddition. Whiter than white: Electron-withdrawing and -donating substituents on the tris(8-hydroxyquinoline)Al III (Alq 3) complexes allow for control of the emission and electroluminescence from green (526 nm) to the blue region (487 nm), and of the fluorescence quantum yield (0.15–0.57).

The compounds used as emitters in OLEDs show a maximum external quantum efficiency (EQE) of 4.6%, which is among the highest observed for Alq 3 complexes. The complexes were used in white-light emitting OLEDs achieving high efficiency (EQE ≈19%) and high white color purity (CRI≈85). • • • • • • • Hydrocarbons. A radical exchange: Chemical modification of silicon surfaces with alkoxyamine-based self-assembled monolayers (SAMs) was achieved by reversible radical nitroxide exchange reactions. The covalent immobilization of various substrates is possible by this approach (see scheme; X=dyes, sugars, peptide or biotin). A prestructured SAM was prepared by Langmuir–Blodgett lithography and successfully used in the nitroxide exchange reaction for site-selective chemical surface modification.

• • • • • • • Ionic Liquids. Tin–carbon analogy: The isolobal relationship between carbon and its heavier congener tin has been analysed by the study of the potential energy surfaces of neutral and dianionic SnC 2P 2R 2 (R=H, tBu, see figure). The results show that major roles are played by 3D aromaticity in the case of neutral isomers and by 2D aromaticity in the case of dianionic isomers. Comparison of stannadiphospholes with other heterodiphospholes indicates that Sn might be a better isolobal analogue to P + than to BH or CH +. • • • • • • • Photophysics. Trogon Mac Scanner Crack more.