A New Molybdenum Cluster Compound. An X-Ray Investigation

It was in 1957, when McCarroll, Katz and Ward1 discovered the presence of an equilateral triangle of · molybdenum atoms in the crystal structure of Zri 2 Mo 3 0 8 , which was only one representative of a series of isostructural compounds of the general formula APMo} V0 8 where A might be Mg, Mn, Fe, Co, Ni, Zn, or Cd. More recently, Ansel and Katz2 have carried out a refinement on the Zn2Mo 30 8 structure and the essential structural features of the original proposal of McCarroll, Katz and Ward were found to be correct. After the refinement, the Mo-Mo distance in the triangle was 2.524 + 0.002 A