MOLYBDENUM AND TUNGSTEN COMPOUNDS WITH THE OTEF5 LIGAND

A new method allows the preparation of Mo(OTeF5)6, O = Mo(OTeF5)4, W(OTeF5)5, and O = W(OTeF5)4. Mo(OTeF5)6 results in experiments of preparing probably unstable Mo(OTeF5)5. Its structure can be described as composed of an octahedron of octahedrons. O = Mo(OTeF5)4 also crystallizes in a molecular lattice and has the known square pyramidal structure with apical positioned double bonded oxygen. The coordination number of the molybdenum atom is increased to six if a long fluorine contact is considered also. W(OTeF5)5 is unstable and could not be obtained in single crystals. It decomposes into W(OTeF5)6 is unstable and could not be obtained in single crystals. It decomposes into W(OTeF5)6 and new O = W(OTeF5)4. The latter molecule is very similar to the analog molybdenum compound, as was shown by single crystal determination also.