Heteronuclear bonding between heavier group 14 elements and transition-metals: novel halogermylene- and stannylene transition-metal complexes L-2(X)MM ' L '(n) [L-2 = PhNC(Me)CHC(Me)NPh; X = Cl, I; M = Ge, Sn; M ' L '(n) = W(CO)(5), Fe(CO)(4)]

摘要

Reactions of the stable heteroleptic halodivalent species L-2(X)M [L-2 = PhNC(Me)CHC(Me)NPh; M = Ge, X = C1 (1) X = 1 (2); M = Sn, X = Cl (5)] with the intermediate metal complexes W(CO)(5) THF and Fe(CO)(4) have provided the new halogermylene- or stannylenetungsten- and iron-complexes L-2(X)MM'L-n' [M'L-n' = W(CO)(5), M = Ge, X = Cl (3), X = 1 (4); M'L-n' = Fe(CO)(4), X = Cl, M = Ge (6), M = Sn (7)] respectively, complexes 3, 4 and 6, 7 have been characterized via X-ray crystallography and a detailed discussion of their structures is presented. All the MM' bonds are very short but calculations are consistent with the (LMX)-M-2 ligands being good sigma-donors and very poor pi-acceptors in complexes 3, 4 and 6, 7. Selective metathesis reaction between 3 and MeLi resulted in the formation of the stable monomeric complex L-2(Me)GeW(CO)(5) (8). (C) 2003 Elsevier Science B.V. All rights reserved. [References: 67]