A novel Mo–Sn chlorocarbonyl compound. X-ray crystal structure of [(CO) 4Mo(μ-Cl) 3Mo(SnCl 3)(CO) 3] and [MoCl(SnCl 3)(CO) 3(NCEt) 2

Abstract

The new heterobimetallic complex [(CO) 4Mo(μ-Cl) 3Mo(SnCl 3)(CO) 3] ( 1) has been prepared by photochemical reaction of Mo(CO) 6 with SnCl 4. The structure of complex 1 was established by X-ray crystallography. The basic structural units of 1 are two seven-coordinate molybdenum atoms, which are linked by three chlorine atoms occupying a bridging position between the molybdenum atoms. The mononuclear seven-coordinate complex [MoCl(SnCl 3)(CO) 3(NCMe) 2] ( 2) is formed by reaction of [(CO) 4Mo(μ-Cl) 3Mo(SnCl 3)(CO) 3] with acetonitrile. Treatment of compound 2 with propionitrile affords [MoCl(SnCl 3)(CO) 3(NCEt) 2] ( 3). A single-crystal X-ray diffraction study of the complex [MoCl(SnCl 3)(CO) 3(NCEt) 2] ( 3) showed that the environment of the molybdenum atom is a distorted capped octahedron with the SnCl 3 anionic ligand occupying the unique capping position above an octahedral face defined by the bridging chlorine and two carbonyl groups.