- Integrative Self-Sorting of Bipyridinium/Diazapyrenium-Based Ligands into Pseudo[1]rotaxanes
-
We present here the design and synthesis of a series of multicomponent supramolecular architectures, structures formed by the PdII/PtII-directed integrative social self-sorting in aqueous media of pairs of complementary N-monoalkyl-4,4′-bipyridinium/2,7-diazapyrenium-based ligands. Out of the different potential outcomes of the processes, we have found out how the designed systems selectively enhance the production of pseudo[1]rotaxanes, hermaphroditic host–guest aggregates that maximize the strength of the occurring π–π, C?H???π, and hydrophobic interactions, as well as the number of those interactions per receptor. It is also demonstrated how both integrative social and narcissistic PdII-directed self-sorting can occur orthogonally and concomitantly for this type of ditopic ligands.
- Rama, Tamara,Blanco-Gómez, Arturo,Neira, Iago,Domarco, Olaya,García, Marcos D.,Quintela, José M.,Peinador, Carlos
-
-
Read Online
- Chromoionophores, VII. Podands Carrying Terminal Electron-Donor- and -Acceptor Groups. Cation-Influenced Charge Transfer Absorption
-
The synthesis and spectroscopic investigation of the new noncyclic neutral ligands 12-20 of the glycol ether type (podands) carrying terminal electron-donor- and -acceptor groups are described.The podands show intramolecular charge transfer interactions which can be influenced selectively by complexed cations.The ligands 13 and 20 cause significant increases of extinction and bathochromic shifts of the charge transfer bands in the UV/Vis spectra on addition of alkali perchlorates, whereas the shorter ligands 14 and 18 show a decrease of extinction and hypsochromic shifts under similar conditions.Some of the noncyclic chromoionophores discern considerably and visually perceivably between Na+ and K+ or Li+ and Na+, respectively, in acetonitrile.The cation selective alterations in the electron spectra are discussed in view of steric effects considering some complex stability constants determined by photometric titrations.
- Loehr, Hans-Gerd,Voegtle, Fritz
-
p. 914 - 921
(2007/10/02)
-