H(C)Ag: a triple resonance NMR experiment for 109Ag detection in labile silver‐carbene complexes

In silver complexes, indirect detection of ¹⁰⁹Ag resonances via ¹H,¹⁰⁹Ag‐HMQC frequently suffers from small or absent J_HAg couplings or rapid ligand dissociation. In these cases, it would be favourable to employ H(X)Ag triple resonance spectroscopy that uses the large one‐bond J_XAg coupling (where the donor atom of the ligand X is the relay nucleus). We have applied an HMQC‐based version of the H(C)Ag experiment to a labile silver‐NHC complex (NHC = N‐heterocyclic carbene) at natural ¹³C isotopic abundance and variable temperature. In agreement with simulations, H(C)Ag detection became superior to ¹H,¹⁰⁹Ag‐HMQC detection above ?20 °C. Copyright © 2014 John Wiley & Sons, Ltd.