Comparative studies on 1,3-xylyl and 2-bromo-1,3-xylyl crown ethers as ion-selective electrodes
作者:Sudersan M. Tuladhar、Gwyn. Williams、Claudius. D'Silva
DOI:10.1021/ac00020a016
日期:1991.10.15
1,3-Xylyl and 2-bromo-1,3-xylyl crown ethers have been tested as ion-selective electrodes in poly(vinyl chloride) (PVC) membranes. The pattern of selectivity appears to be essentially independent of ring size and probably reflects the ease with which substitution of water molecules from the inner hydration sphere of the ion can be effected. The ionophores have proved to be good K+ neutral carriers showing near-Nernstian responses to this ion, in the range 10(-1)-10(-4) M. The fixed-interference method was used to determine relative selectivity coefficients for all the electrodes. The highest selectivity for potassium relative to sodium, lithium, calcium, and magnesium was obtained with 1,3-xylyl-15-crown-5 ether using NPOE plasticizer. The compounds tested exhibited a fast Nernstian response to changes in K+ concentration, which was stable to within < 100-mu-V/h.
Crown ether Grignard reagents; x-ray structure of 2-(bromomagnesio)-1,3-xylyl-15-crown-4
作者:Peter R. Markies、Otto S. Akkerman、Friedrich. Bickelhaupt、Wilberth J. J. Smeets、Anthony L. Spek
DOI:10.1021/ja00221a030
日期:1988.6
Synthetic molecular receptors for urea. Macrocyclic ligands with intraannular acidic groups and the complexes with urea
作者:Catherina J. Van Staveren、Veronika M. L. J. Aarts、Peter D. J. Grootenhuis、Wichert J. H. Droppers、Johan. Van Eerden、Sybolt. Harkema、David N. Reinhoudt
DOI:10.1021/ja00232a028
日期:1988.11
Intraannular functionalization of macrocyclic polyethers via organolithium intermediates
作者:Maria Skowronska-Ptasinska、Veronika M. L. J. Aarts、Richard J. M. Egberink、Johan Van Eerden、Sybolt Harkema、David N. Reinhoudt
DOI:10.1021/jo00258a017
日期:1988.11
Gruter, Gert-Jan M.; Van Baar, Ben L. M.; Gerrits, Tom J., Journal of the Chemical Society. Perkin Transactions 2 (2001), 1996, vol. 5, p. 925 - 932
作者:Gruter, Gert-Jan M.、Van Baar, Ben L. M.、Gerrits, Tom J.、Akkerman, Otto S.、Bickelhaupt, Friedrich、Barkow, Anja、Kuck, Dietmar