The chemical shifts for the 1 H NMR signal A follow a clear trend: The ligands with higher electron density at the endocyclic backbone feature a signal shifted upfield towards lower ppm values with an overall trend dmm>maac>acac>fod>hfac, which is the same for all Cu and Ag complexes.
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Role of Anionic Backbone in NHC-Stabilized Coinage Metal Complexes: New Precursors for Atomic Layer Deposition.
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