Synthesis and Photoswitchable Complexation/Extraction Properties of Lipophilic Azabis(benzo-15-crown-5) Ionophores for Alkali Metal Cations
摘要:
Novel lipophilic derivatives of azobis(benzo-15-crown-5) (1b, 1c) were synthesized and their photoisomerization, complexation and extraction properties for alkali metal cations were investigated. Upon UV light irradiation, the photostationary state of the trans and cis isomers was reached and, with both 1b and 1c, the extractabilities of Rb+ and Cs+ increased due to the formation of 1:1 sandwich-type complexes by the cis isomers. On the other hand, the extractability of K+ decreased, possibly because the 2:1 complexes formed by the trans isomers are more stable and/or lipophilic than the complexes of the cis isomers.
Various new nucleosides bearing one or two lipophilic groups at the 2′-position have been synthesized. The lipophilic substituents were attached to a 2′-hydroxy, 2′-amino, or 2′-thio function. These lipophilic nucleosidesanchor in large unilamellar POPC vesicles serving as phospholipidmembrane models. The insertion of these molecules into the membranes was investigated by NMR techniques. For comparison
Synthesis of alkyl glycerolipids with various cationic groups linked directly to the glycerol backbone
作者:M. A. Maslov、E. V. Sycheva、N. G. Morozova、G. A. Serebrennikova
DOI:10.1007/bf02495307
日期:1999.7
A number of positively charged lipids containing pyridinium, N-methylmorpholinium, N-methylimidazolinium, 4-N,N-dimethylaminopyridinium, and 4-N,N-dimethylcyclohexylammonium groups linked directly to the C(3) atom of 1,2-di-O-alkylglycerols with Br-, MsO-, and TsO- anions as counterions were synthesized.