Ion-Transfers of Sodium and Potassium Cations Facilitated by Naphtho-15-crown-5 between Water and Nitrobenzene.

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

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 ra...

Bis[aqua­(2,3-naphtho-15-crown-5)sodium] tetra­kis(thio­cyanato-κN)cobaltate(II)

The title complex, [Na(C(18)H(22)O(5))(H(2)O)](2)[Co(NCS)(4)], consists of two aqua-(2,3-naphtho-15-crown-5)sodium complex cations and one [Co(NCS)(4)](2-) complex anion, which has crystallographic symmetry. In the anion, the Co(II) centre is coordinated by the N atoms of four NCS(-) ligands in a distorted tetra-hedral geometry. In the complex cations, the Na(I) centre is coordinated by five O ...

Potassium ion recognition by 15-crown-5 functionalized CdSe/ZnS quantum dots in H2O.

Based on 15-crown-5 functionalized CdSe/ZnS quantum dots (QDs), we report a novel fluorogenic sensor to probe K+ ions in H2O; recognition of K+ can be achieved via the Förster type of energy transfer between two different color QDs, so that [K+] of the order of 10(-6) M can be promptly detected.

Distribution of Microamounts of Cesium in the Two-Phase Water-HCl-Nitrobenzene-2,3-Naphtho-15-crown-5-Hydrogen Dicarbollylcobaltate Extraction System.

Extraction of microamounts of cesium by a nitrobenzene solution of hydrogen dicarbollylcobaltate (H+B-) in the presence of 2,3-naphtho-15-crown-5 (N15C5, L) has been investigated. The equilibrium data have been explained assuming that the complexes HL+, HL+2, CsL+ and CsL+2 are extracted into the organic phase. The values of extraction and stability constants of the species in nitrobenzene satu...

Ion-transfer polarographic determination of successive formation constants of rubidium and cesium complexes with benzo-15-crown-5 and -18-crown-6 ethers in nitrobenzene.