Ion-chromatographic Behavior of Silica Gels Modified by Poly- and Bis(crown ether)s of Benzo-18-crown-6

Hydration to benzo-15-crown-5, benzo-18-crown-6 and the benzo-18-crown-6-potassium ion complex in the low-polar organic solvents.

The coextraction of water with benzo-15-crown-5 (B1SC5), benzo-18-crown-6 (B18C6) and the B18C6-K+ complex into seven low-polar solvents, i.e., carbon tetrachloride (CTC), chloroform (CF), dichloromethane (DCM), 1,2-dichloroethane (1,2-DCE), benzene (BZ), chlorobenzene (CB) and o-dichlorobenzene (o-DCB), has been investigated. The mean hydration number, nH2O, of these solutes in the water-satur...

EXTRACTION-SPECTROPHOTOMETRIC DETERMINATION OF AMMONIUM ION BY DIBENZO- 18-CROWN-6 AND CALMAGITE

An extraction-spectrophotometric method for the determination of trace amounts of ammonium ion is described. Ammonium ion is effectively extracted as a neutral ternary complex NH . DB 18C6. calmagite at pH 3.0 into chloroform, followed by spectrophotometric determination at =48 5 nm. Molar absorptivity of the ternary complex at this wavelength is 1.08 10 mol cm . Beer's law is obeyed over...

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.

Di-Benzo-18-Crown-6 and its Derivatives as Ligands in the Search for Ion Channels

Based on the previously reported one-dimensional channel system [(H2O) (DB18C6)(μ2-H2O)2/2][(H3O) (DB18C6)(μ2H2O)2/2]I3 (2), which is realized by stacking of crown ether molecules (DB18C6 dibenzo-18-crown-6), other synthetic approaches towards ionic channels and their results are presented in this paper. The “cutting out” approach using DB18C6 as scissor, applied on NaI, yields the compound [Na...

extraction-spectrophotometric determination of ammonium ion by dibenzo- 18-crown-6 and calmagite

an extraction-spectrophotometric method for the determination of trace amounts of ammonium ion is described. ammonium ion is effectively extracted as a neutral ternary complex nh . db 18c6. calmagite at ph 3.0 into chloroform, followed by spectrophotometric determination at =48 5 nm. molar absorptivity of the ternary complex at this wavelength is 1.08 10 mol cm . beer's law is obeyed over ...