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Short Metal−Metal Separations in a Highly Luminescent Trimetallic Ag(I) Complex Stabilized by Bridging NHC Ligands

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journal contribution
posted on 12.08.2003, 00:00 authored by Vincent J. Catalano, Mark A. Malwitz
Reaction of 1,3-bis(2-pyridinylmethyl)-1H-imidazolium salt, [H(pyCH2)2im]X (X = BF4- or Cl-), with silver oxide in acetonitrile readily yields yellow-brown [((pyCH2)2im)2Ag]X, 1·BF4 or 1·Cl. The chloride salt crystallizes with 3.650 Å intermolecular Ag···Ag interactions while 1·BF4 shows no short intermolecular interaction. Addition of excess Ag(BF4) produces the homoleptic carbene bridged trimetallic species, [(μ-NHC)3Ag3](BF4)3, 2. This species contains very short Ag−Ag separations between 2.7249(10) and 2.7718(9) Å. In solution, these complexes are photoluminescent.