Ethene complexes of the coinage metals with WCAs
Compounds including the free or coordinated gas-phase cations [Ag(η2-C2H4)n]+ (n=1–3) were stabilized with weakly coordinating anions [A] (A = Al(OC(CH3)(CF3)2)4, n=1; Al(OC(H)(CF3)2)4, n=2; Al(OC(CF3)3)4, n=3 ;
((F3C)3CO)3Al-F-Al(OC(CF3)3)3, n=3).[1]
[M(C2H4)3][Al(OC(CF3)3)4]
M = Cu, Ag, Au
Solution NMR spectroscopy shows that the ligands are very weakly bound, yielding a dynamic system in solution. In agreement with the isostructural homoleptic group 10 metal ethene complexes,[36–38] the solid-state structures of 5 and 6 include a trigonal planar coordinated silver cation. The preference for this, sterically less favorable, planar “spoke wheel” structure has to be attributed to orbitalbased interactions.[1]
Furthermore the gold(I) and copper(I) analog [M(η2-C2H4)3][A] were synthesized in our group.
[1] A. Reisinger, N. Trapp, C. Knapp, D. Himmel, F. Breher, H. Regger, I. Krossing, Chem. Eur. J.2009, 15, 9505 – 9520.
[36] K. Fischer, K. Jonas, G. Wilke, Angew. Chem. 1973, 85, 620 –621;Angew. Chem. Int. Ed. 1973, 12, 565 –566.
[37] M. Green, J. A. K. Howard, J. L. Spencer, F. G. A. Stone, J. Chem.Soc. Chem. Commun. 1975, 449 – 451.
[38] M. Green, J. A. K. Howard, J. L. Spencer, F. G. A. Stone, J. Chem.Soc. Dalton Trans. 1977, 271 –277.