19F, (1)H-HOESY and PGSE NMR studies of neutral trinuclear complexes of Au(I) and Hg(II): evidence for acid-base stacking in solution.

By combining the information from 19F, 1H-HOESY and PGSE NMR methodologies, unprecedented direct evidence has been obtained for the formation of supramolecular assemblies in solution between the trinuclear cyclic AuI basic compounds ([Au(mu-C2,N3-bzim)]3 (bzim = 1-benzylimidazolate), 1, and [Au(mu-C,N-C(OEt)=N-p-C6H4-CH3)]3, 2, on one hand, and the trinuclear cyclic HgII acid complex [Hg(mu-C,C-C6F4)]3, 3, on the other hand. HOESY experiments indicate that a stacking similar to that observed in the solid state occurs. PGSE studies demonstrate the presence of an equilibrium between the free trinuclear entities and adduct A in the case of 2/3 admixtures (see Sketch) while for 1/3 admixtures, adducts A and B are mainly present in solution.

Luminescent Chains Formed from Neutral, Triangular Gold Complexes Sandwiching Tl and Ag. Structures of {Ag([Au(μ-C,N-bzim)])}BF·CHCl, {Tl([Au(μ-C,N-bzim)])}PF·0.5THF (bzim = 1-Benzylimidazolate), and {Tl([Au(μ-C(OEt)═NCHCH)])}PF·THF, with MAu (M = Ag, Tl) Cluster Cores.

It has been found that several trinuclear complexes of Au interact with silver and thallium salts to intercalate Ag and Tl cations, thereby forming chains. The resulting sandwich clusters center the cations between the planar trinuclear moieties producing structures in which six Au atoms interact with each cation in a distorted trigonal prismatic coordination. The resultant (BABBAB) pattern of metal atoms also shows short (∼3.