COMMUNICATIONS ence experiments, which indicate the proximity of the marked CH, groups ( Fig. 1) to the pyridine protons, and by the small chemical shift of the pyridine protons which reflect the anisotropy of the pyridine ring.
Four different hydrogenated amorphous carbon (a-C:H) coatings were deposited on polyether-ether-ketone (PEEK). Their properties in terms of surface roughness, wettability, nanoindentation, residual internal stress, adhesion, scratch resistance, friction and wear resistance were assessed. The two polymer-like carbon coatings were obtained without applying any bias voltage to the substrate. They exhibited very low hardness, Young's modulus and residual internal stress compared with what is generally achieved for diamond-like carbon films. Nonetheless, they enabled to significantly reduce wear when rubbed against an alumina ball. They also showed
Aus leicht zugänglichen chiralen Aldehyden und Pyrrol Können in einem Schritt Porphyrine wie 1 erhalten werden, deren MnCl‐Derivate effektive Katalysatoren für die enantioselektive Epoxidierung nichtfunktionalisierter Olefine sind. neue Impulse für das Design chirotroper Porphyrinliganden dürften sich auch aus der Tatsache ergeben, daß bei der Synthese von 1 bevorzugt dessen D2‐symmetrisches Isomer entsteht, aufwendige Atropisomerentrennungen also entfallen. magnified image
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