calix[4](diseleno)crownethers 3 and 4 were synthesized by reaction of the disodium salt of 1,3-propanediselanol with the preorganized 1,3-dibromoethoxylcalix[4]arenes 1 and 2. Compound 3 forms an interesting infinite sheet aggregate via self-inclusion and intermolecular Se⋯Se interactions in the solid state. Preliminary evaluation of 3 and 4 as ionophores for ion-selectiveelectrodes (ISEs) is reported
The syntheses and Ag+-selective electrode properties of benzothiazolylthiaalkoxy functionalized calix[4]arenes: an investigation of the structure–selectivity relationship in the ionophore-based ISEs
A series of benzothiazolylthiaalkoxy functionalized calix[4]arenes with different tether length between the benzothiazolyl and calix[4]aryl groups have been synthesized and characterized for comparison between the coordinate adjustment behaviors of the two benzothiazolyl groups in the generation of ion-selective electrodes (ISEs). ISEs based on these calix[4]arenes showed excellent Ag+ selectivities, log K-Ag,M(pot) less than or equal to-4.0, against most of the interfering cations examined, except for H having a very weak interference (log K(Ag,M)(pot)less than or equal to-2.5). Their plausible recognition mechanism as well as their structure-selectivity relationships are also discussed. (C) 2002 Elsevier Science Ltd. All rights reserved.
Zeng; Chen; Weng, Journal of Chemical Research - Part S, 2000, # 11, p. 518 - 519