Contact and pseudo-contact lanthanide-induced shifts in the nuclear magnetic resonance spectrum of quinoline

Abstract

Contact shifts produced by trisdipivaloylmethanatogadolinium [Gd(dpm)₃] are used to analyse the observed ¹H and ¹³C lanthanide-induced shifts of quinoline with Ln(dpm)₃ complexes (Ln = Pr, Nd, Eu, Dy, Ho, Er, and Yb). The analysis gives varying contact and pseudo-contact contributions for the lanthanides, the former depending on 〈S_z〉 and the degree of covalency of the Ln–N bond, and the latter in agreement with theory.