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By Vincenzo Balzani, Alberto Credi, Belen Ferrer, Serena Silvi (auth.), T. Ross Kelly (eds.)

"In my opinion, this booklet offers deep perception into this interesting, not easy, and more and more very important field.
Are you curious about molecular machines and seeking out a accomplished publication to benefit the $64000 actual paradigms and artificial options? Do you train molecular machines in a chemistry or engineering path at a faculty and wish to contain the standard and a few strange experimental innovations on your direction? Are you knowledgeable in molecular machines and want to stay alongside of fresh advancements? do you want to understand why the paintings on molecular machines is difficult the vintage definition of chemical engineering? the reply to all 4 questions is similar: this is the booklet for you! "(Stefan H. Bossmann, Kansas nation collage, J.AM.Chem.soc. vol.128, No.32, 2006, JA0697301)

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It takes virtually hours, at room temperature in a coordinating solvent such as acetonitrile, for the thermodynamically unstable 4-coordinate complex 32+ 4 to rearrange and afford the stable form of the divalent copper complex, 32+ 5 . As already mentioned, the changeover process of the monovalent complex, (3+5 → 3+4 ) is much faster 2+ than the reverse rearrangement on the divalent copper complex (32+ 4 → 35 ). The sliding process has to involve decoordination of the metal. This step is expected to be much slower for Cu(II) than for Cu(I) due to the greater charge of the former cation.

50 . 50 . 51 . 54 . 57 Conclusion and Prospective . . . . . . . . . . . . . 58 References . . . . . . . . . . . . . . . . . . . . 4 5 Abstract In the course of the last decade, many dynamic molecular systems, for which the movements are controlled from the outside, have been elaborated. P. Collin et al. 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 and studied in Strasbourg.

Upon addition of one electron in each of the BPM units, the two macrocycles move on the AMH stations (Fig. 14b, state 1), and move back to the original position when the bipyridinium units are reoxidized. A clever—albeit complex—way to obtain a unidirectional full rotation in a catenane having the same topology of 9H26+ was devised by another research group [117]. Other examples of molecular motors based on catenanes can be found in the literature [25–28, 118]. 3 Conclusion and Perspectives The results described here show that, by taking advantage of careful incremental design strategies, of the tools of modern synthetic chemistry, of the paradigms of supramolecular chemistry, as well as inspiration from natural systems, it is possible to produce compounds capable of performing nontrivial mechanical movements and exercising a variety of different functions upon external stimulation.

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