Photoresponsive crown ethers. 4. Influence of alkali metal cations on photoisomerization and thermal isomerization of azobis(benzocrown ethers)

Bis(crown ethers) derived from biphenyl: extraction and electrochemical properties

“…As a result of such a complex formation, the bis(crown ether) exhibits excellent selectivities towards certain cations as compared to the corresponding monocycles analogues. 2,3 On the other hand, bis(crown ether) compounds have also been used as carriers in transport experiments, giving rise to different selectivities and efficiencies. This behaviour can be related to the strong effect of the stability of the cationcarrier complex on the transport efficiency.…”

Molecular Machines Useful for the Design of Chemosensor

“…Shinkai et al [20][21][22][23][24] synthesized a series of azobis(benzocrown ethers) called "butterfly crown ethers" such as 19 and 20. It was found that the content of the (Z)-forms at the photo stationary state is remarkably increased with increasing concentration of Rb+ and Cs+ which interact with two crown rings in a 1:2 sandwich manner.…”

Theoretical insight into azobis-(benzo-18-crown-6) ether combined with the alkaline earth metal cations

“…Besides, the well known metal cation complexing agents are molecular receptors based on macrocyclic ligands, such as crown ethers [1], TOC sheets [2], porphyrin blocks [3] and so on. These cyclic molecules which composed of oxygen donor atoms can bind cations in their cavities, especially alkali metal ions [4][5][6] and alkaline earth metal ions [7,8]. Azobenzene, one of the most famous photosensitive chromophore unit, can undergo trans-cis isomerization in response to light irradiation [9][10][11][12], thermal induction [13,14] and electric fields stimuli [15][16][17][18].…”