New [Mo(eta(3)-allyl)(CO)(2)L-3](+) complexes with monodentate or tridentate nitrogen-donor ligands

摘要

Cationic complexes [Mo(eta(3)-allyl)(CO)(2)L-3](+) (L-3 = either nitrogen-donor tridentate ligand or three monodentate ligands) were prepared in high yield and under mild conditions using as precursors either the triflato complex [Mo(eta(3)-allyl)(OTf)(CO)(2)(NCMe)(2)] or the combination of the chloro complex [Mo(eta(3)-allyl)Cl(CO)(2)(NCMe)(2)] and the salt NaBAr4' (Ar = 3,5-bis(trifluoromethyl)phenyl). The tridentate ligands employed were 2,2':6',2'-terpyridine (terpy) and cis, cis-1,3,5-cyclohexanetriamine (CHTA), whereas the monodentate ligands imidazole (im) and 3,5-dimethylpyrazole(dmpz) were chosen. In order to stabilize the labile intermediates, an excess of acetonitrile was used in most of the syntheses. However, the pyrazole complex was prepared through a nitrile-free route to avoid reactions at the coordinated nitrile. The solid state structures of [Mo(eta(3)-methallyl)(CO)(2)(terpy)]OTf (2), [Mo(eta(3)-methallyl)(CO)(2)(CHTA)]BAr4' (3), [Mo(eta(3)-methallyl)(CO)(2)(NCMe)(3)]BAr4' (4), [Mo(eta(3)-allyl)(CO)(2)(im)(3)]OTf (5) and [Mo(eta(3)-allyl)(CO)(2)(dmpz)(3)]BAr4' (6) were determined by means of single-crystal X-ray diffraction.