Molecular train

Figure 5.23 Schematic illustration of the organization of the molecular train monolayer assembly on a gold electrode and its photoinduced translocation. Reprinted from /. Electroanal. Cheat., 497, I. Willner, V. Pardo-Yissar, E. Katz and K. T. Ranjit, A photoactive "molecular train" for optoelectronic applications light-simulated translocation of a /3-cyclodextrin receptor within a stoppered azobenzene-alkyl chain supramolecular monolayer assembly on an Au-electrode, 172-177, Copyright (2001), with permission of Elsevier Science...

Ashton PR et al (1991) Molecular trains - the self-assembly and dynamic properties of 2 new catenanes. Angew Chem Int Ed Engl 30 1042-1045... 

The consequences of increasing the size of the polyether macrocycle to 68 members (that is, by a factor of two over the small ring system) was investigated. Accordingly, the synthesis of tetrakis-/ -phenylene-68-crown-20 was achieved in dimethylformamide at room temperature in excellent yield and this, in turn, was initially used to produce the [2]-catenane 22 (Figure 5.13). From the temperature dependence of the H NMR spectrum, 22 appears to behave like a molecular train - with the tetracationic cyclophane travelling from station to station around the... 

In addition to these molecular shuttles, other dynamic supramolecular systems have been reported with the development of molecular trains utilizing catenanes [79], where one catenane ring can continually cycle around another via several stations. Sauvage and co-workers ]80-83] reported electrochemically induced ring gliding in copper catenanes which exploits the differing preferred geometries associated with Cu(I)/Cu(II). 

Katz K. T. Ranjit, A photoactivated molecular train for optoelectronic applications light-stimulated translocation of a beta-cydodextrin receptor within a stoppered azobenzone-alkyl chain supramolecular monolayer assembly on a Au-electrode. J. Electro-anal. Chem. 2001, 497, 172-177. 

FIGURE 89.9 Organization of the molecular train (MT) assembly on a gold electrode and its photoinduced translocation. The MT assembly consists of a station S, a railway R, a locomotive L, and a barrier B (see text). ( From Willner, I., Pardo-Yissar, V., Katz, E., and Ranjit, K., /. Electroanalytical Chemistry, 497, 172, 2001. Reprinted with... 

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