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H(C)Ag: a triple resonance NMR experiment for 109 Ag detection in labile silver‐carbene complexes
Author(s) -
Weske Sebastian,
Li Yingjia,
Wiegmann Sara,
John Michael
Publication year - 2015
Publication title -
magnetic resonance in chemistry
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.483
H-Index - 72
eISSN - 1097-458X
pISSN - 0749-1581
DOI - 10.1002/mrc.4196
Subject(s) - chemistry , carbene , ligand (biochemistry) , dissociation (chemistry) , resonance (particle physics) , nuclear magnetic resonance spectroscopy , crystallography , stereochemistry , organic chemistry , catalysis , atomic physics , biochemistry , physics , receptor
In silver complexes, indirect detection of 109 Ag resonances via 1 H, 109 Ag‐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 13 C isotopic abundance and variable temperature. In agreement with simulations, H(C)Ag detection became superior to 1 H, 109 Ag‐HMQC detection above −20 °C. Copyright © 2014 John Wiley & Sons, Ltd.