Bipyridine complexes of E³⁺ (E = P, As, Sb, Bi): strong Lewis acids, sources of E(OTf)₃ and synthons for E^I and E^V cations.

ABSTRACT: Triflate salts of trications [(bipy)₂E]³⁺ ([6E][OTf]₃) and [(tbbipy)₂E]³⁺ ([6'E][OTf]₃) (bipy = 2,2'-bipyridine, tbbipy = 4,4'-di- ^t butyl-2,2'-bipyridine; E = P, As, Sb, Bi) have been synthesized and comprehensively characterized. The unique molecular and electronic structures of this new class of complexes involving pnictogen Lewis acids has been assessed in the solid, solution and gas phases to reveal systematic variations in metric parameters, ligand lability and charge concentration. While the Lewis acidity of E³⁺ has the trend E = Bi < Sb < As < P as determined by gas-phase calculations and ¹H NMR spectroscopy, the Lewis acidity of [6E]³⁺ has the t

SUBMITTER: Chitnis SS 

PROVIDER: S-EPMC6054056 | biostudies-literature | 2015 Nov

REPOSITORIES: biostudies-literature