title: Structure-property relationships of a tetrapyrrolidinyl PNP-lariat ether and its complexes with potassium, sodium, and silver cations.
abstract: Spectral properties of the tetrapyrrolidinyl PNP-lariat ether, L, and its complexes with K+, Na+, and Ag+ were investigated. Crystal structures of L and its complex with potassium iodide [KL]I were determined. Protonation constants of the ligand and formation constants of its complexes with Ag+, K+, and Na+ in aqueous solutions were determined. 1H NMR, 31P NMR, FTIR, and ESIMS spectra as well as potentiometric measurements indicate that complexation of Ag+ involves participation of the polyether oxygen donors and the endocyclic nitrogen atom of the cyclophosphazene ring. On the other hand, for complexation of K+ and Na+, only polyether oxygen atoms are involved. The latter conclusion is confirmed in the solid-state structure of the [KL]I complex.
authors.affiliation: Institute of Polymer Chemistry, Polish Academy of Science, 41-800 Zabrze, Poland.
authors.forename: K
authors.initials: K
authors.lastname: Brandt
authors.forename: P
authors.initials: P
authors.lastname: Seliger
authors.forename: A
authors.initials: A
authors.lastname: Grzejdziak
authors.forename: T J
authors.initials: TJ
authors.lastname: Bartczak
authors.forename: R
authors.initials: R
authors.lastname: Kruszynski
authors.forename: D
authors.initials: D
authors.lastname: Lach
authors.forename: J
authors.initials: J
authors.lastname: Silberring