Synthesis and crystal structures of cyclodiazastannoxides fused cyclopentadienyl M–Sn (M = Mo, W) bonded organometallic heterocycle
摘要:
The condensation reaction of CH3COC5H4M(CO)(3)SnCl3 (M = Mo or W) with PyCONHNH2 (Py = 2,3,4-pyridyl or 2-pyridylmethyl) in mild conditions yields cyclodiazastannoxides fused cyclopentadienyl M-Sn bonded organometallic heterocycle {mu-[C5H4(CH3)C=N-N=C(O)PyH]M(CO)(3)SnCl3}. The similar reaction of CH3COC5H4M(CO)(3)SnCl3 with ArCONHNH2 (Ar = 2-furanyl) gives complexes mu-[C5H4(CH3)C=N-N=C(O)Ar]M(CO)(3)SnCl2(H2O), in which the water molecule can be replaced by other N-donor ligands, such as pyridine or 4,4-bipyridine. Arene-bridged organometallic heterocyclic complexes mu-{[C5H4(CH3)C=N-N=C(O)](2)C6H4}{M(CO)(3)SnCl2(Solvent)}(2) have also been prepared by the reaction of CH3COC5H4M(CO)(3)SnCl3 with terephthaloyl hydrazine. In these new organometallic heterocyclic complexes, it seems that the tin atom prefers to be six-coordinate through absorbing the chloridion or solvent molecules. (c) 2005 Elsevier B.V. All rights reserved.
New pentacoordinate bicyclodiazastannsulfide fused cyclopentadienyl M-Sn (M = Mo or W) bonded organometallic heterocycle mu-[C5H4(CH3)C=N-N=C(S)Ar]M(CO)(3)SnCl2} has been obtained by the condensation reaction of CH3COC5H4M(CO)(3)SnCl3 with arylthiocarboxyhydrazide (ArCSNHNH2, Ar = 2-furanyl, 2-thienyl, 2- or 4-hydroxyphenyl) in mild conditions. While the similar reaction of CH3COC5H4M(CO)(3)SnCl3 with ArCONHNH2 (Ar = 2- or 4-hydroxyphenyl) only gives non-cyclic compounds [C5H4(CH3)C=N-NHC(O)Ar]M(CO)(3)SnCl3, in which the tin atom remains tetracoordinate. In bicyclodiazastannsulfide the tin atom prefers to adopt pentacoordinate geometry, while in the corresponding bicyclodiazastannoxide the tin atom is hexacoordinate. In addition, phenylhydrazine, 2- or 4-hydroxyphenylcarboxyhydrazide is used to react with CH3COC5H4M(CO)(3)SnCl3, only tetracoordinate non-cyclic tin compound is obtained. (c) 2006 Elsevier B.V. All rights reserved.