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The photochemical properties of transition metal complexes, such as those of iridium(III) or ruthenium(II),can be exploited in various ways to generate charge-separated (CS) states, in relation to the mimicry ofthe natural photosynthetic reaction centres, or to set multicomponent compounds or assemblies in motion.The first part of the present chapter summarizes the work carried out in our groups (Bologna...
In the course of the last decade, many dynamic molecular systems, for which the movements are controlled from the outside, have been elaborated. These compounds are generally referred to as “molecular machines”. Transition-metal-containing catenanes and rotaxanes are ideally suited to build such systems. In the present review article, we will discuss a few examples of molecular machines elaborated...
Völliger Kollaps: Ein porphyrinisches [4]Rotaxan kollabiert nach Demetallierung vollständig. Während die Verbindung ohne Metall nicht als Rezeptor wirkt, ist sie bei Kupfer(I)‐Komplexierung ein selektiver Rezeptor für Diamin‐ und Dipyridylsubstrate (siehe Bild). Der Erkennungsprozess kann entsprechend durch Koordination des freien Liganden an vier Kupfer(I)‐Ionen und Demetallierung an‐ bzw. ausgeschaltet...
Copper(I)-induced threading of 5,5′-diazidomethyl-2,2′-bipyridine through a coordinating ring followed by reaction of a propargyl ether attached to a stopper group leads to the desired rotaxane in 62% yield. The reaction is carried out under the ‘click chemistry’ conditions with 0.75equiv of additional copper(I).
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