15-Crown-5

About: 15-Crown-5 is a research topic. Over the lifetime, 1074 publications have been published within this topic receiving 15093 citations. The topic is also known as: 15-crown-5 ether.

Recognition of potassium ion in water by 15-crown-5 functionalized gold nanoparticles.

Abstract: Reported here is an efficient recognition of K+ by 15-crown-5 functionalized gold nanoparticles in aqueous matrix containing physiologically important cations, such as Li+, Cs+, NH4+, Mg2+, Ca2+, and excess amount of Na+. Upon exposure to K+, the colloidal solution changes from red to blue, in response to surface plasmon absorption of dispersed and aggregated nanoparticles. The concentration ranges of K+ detected in this study are 0.099−0.48 mM and 7.6 μM−0.14 mM, when concentrations of colloidal gold are 54.9 and 7.1 nM, respectively. Recognition of K+ and formation of the aggregates are proposed via a sandwich complex of 2:1 between 15-crown-5 moiety and K+. Also discussed is the possibility of a preorganized structure of 15-crown-5 at the water−organic interface for the efficient complexation with K+.

Crown thioether chemistry: structural and conformational studies of tetrathia-12-crown-4, pentathia-15-crown-5, and hexathia-18-crown-6. Implications for ligand design

Abstract: Tetrathia-12-crown-4 cristallise dans le systeme monoclinique, groupe d'espace Cc et sa structure est affinee jusqu'a R=0,0377. Pentathia-15-crown-5 cristallise dans le systeme monoclinique, groupe d'espace P2 1 /n avec R=0,0455 Hexathia-18-crown-6 cristallise dans le systeme orthorhombique, groupe d'espace Fdd2 avec R=0,0667