Organometallic chemistry of silver and copper N‐heterocyclic carbene complexes

Structural Diversity of Copper(I)–N‐Heterocyclic Carbene Complexes; Ligand Tuning Facilitates Isolation of the First Structurally Characterised Copper(I)–NHC Containing a Copper(I)–Alkene Interaction

“…The Cu-C bond lengths of 1.91 and 1.92 Å are within the usual range for copper(I)-NHC complexes, as are the Cu-Br bond lengths (both 2.28 Å). [24,25,28] This indicates that the cuprophilic interaction does not significantly modify the electronic properties of the copper(I) centres.…”

“…The Cu-C bond length, at 1.91 Å, is normal for this type of complex. [24,25,28] Complex 2b crystallises as a dimer with a weak though unusual cuprophilic interaction (Cu---Cu = 2.74 Å) ( Figure 3). These types of interaction are usually observed due to the bidentate nature of a ligand bringing the copper centres into close proximity.…”

New Pyridazine‐Bridged NHC/Pyrazole Ligands and Their Sequential Silver(I) Coordination

“…Silver(I) complexes of NHC-based ligands are attracting much attention because of their large structural diversity, [14] their potentially interesting photophysical properties [15] and their convenient use in transmetallation reactions for the preparation of various other NHC complexes. [16] They are readily synthesized from imidazolium ligand precursors by the addition of basic silver salts such as silver acetate, silver carbonate or the most commonly used Ag 2 O.…”

Silver: Organometallic Chemistry

“…Remarkable stability of the Ag I -C σ -bond has been observed with a broad class of organic ligands called ylides (see Ylide) (5). These neutral or anionic ligands are believed to contribute stability 46 to the metal -carbon bond by delocalization of charge away from the metal atom to the ligand.…”

“…Arnold reviewed advances in this chemistry in 2002. 5 The relatively small energy separation 6 (about onehalf the value for Cd II ) between the filled d orbitals and the 5s orbital tends to cause the coordination about Ag I to be linear with strongly donating ligands such as are found in organometallic species. Ag II or Ag III organometallic species are also much more difficult to obtain than similar copper and gold compounds.…”