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.
Burini
Alfredo
A
Dipartimento di Scienze Chimiche, University of Camerino, Via S. Agostino, 1-062032 Camerino, Italy.
Fackler
John P
JP
Galassi
Rossana
R
Macchioni
Alceo
A
Omary
Mohammad A
MA
Rawashdeh-Omary
Manal A
MA
Pietroni
Bianca R
BR
Sabatini
Stefano
S
Zuccaccia
Cristiano
C