2515-27-7Relevant articles and documents
Ammonium and Potassium Salts of a Hexacoordinate Phosphorus(V) Anion Featuring P-O and P-C Bonds
Hazin, Khatera,Patrick, Brian O.,Gates, Derek P.
, p. 188 - 198 (2019)
Ammonium and potassium salts featuring the chiral mer-[P(C6H4CO2)3]-, mer-[1]-, have been isolated. Specifically, treating phosphorane P(C6H4CO2)2(C6H4CO2H), 2, with N-containing bases [Nbase = PhNMe2, PhNH2, pyridine (py), isoquinoline, (-)-brucine, N(n-C8H17)3] afforded ammonium salts [NbaseH]+-mer-[1]-. Each compound was fully characterized spectroscopically, and four were subjected to X-ray crystallographic analysis. Salts were isolated with the racemic mixture of the mer-[1]- anion except in the case of [(-)-brucineH]-λ-mer-[1], for which the crystal analyzed was enantiomerically pure. The potassium salt, K-mer-[1], was synthesized by treating 2 with KH. The solid-state structure of K-mer-[1] is a coordination polymer consisting of seven- and eight-coordinate K+ ions that are weakly bound by oxygen of either the racemic anion or the methanol solvent. Preliminary NMR and MS data for the formation of the Br?nsted acid, H(DMF)n[1], has also been obtained. An estimate of the basicity of anion mer-[1]- was obtained from IR measurements of the N-H stretching frequency for [(n-C8H17)3NH]-mer-[1]. On the basis of these measurements, anion mer-[1]- was ranked similar to the classical weakly coordinating anion, [ClO4]-, in terms of its coordinating ability.
