(Acetato)tris(N,N′-diphenylacetamidinato)dimolybdenum and bis(acetato)bis[N,N′-bis(2,6-xylyl)acetamidinato]dimolybdenum tetrakis(tetrahydrofuranate). Two new mixed-ligand quadruply bonded dimolybdenum compounds

Article abstract of DOI:10.1021/ic50217a058

The structures of the two mixed-ligand dimolybdenum compounds Mo₂[[(2,6-xylyl)N]₂CCH₃]₂(CH ₃CO₂)₂·4THF (1) and Mo₂[(PhN)₂CCH₃]₃(CH ₃CO₂) (2) are reported. Compound 1 crystallizes in the triclinic space group P1 with unit cell parameters a = 11.637 (2) A?, b = 11.665 (1) A?, c = 11.824 (2) A?, α = 90.82 (1)°, β = 108.75 (1)°, γ = 70.02 (1)°, V = 1420.2 (6) A?³, and Z = 1. Each molecule has 2 axially coordinated THF molecules and resides on a center of inversion. The Mo-Mo bond length is 2.107 (1) A?, and the average Mo-O(acetate) and Mo-N bond lengths are 2.107 (4) and 2.162 (5) A?, respectively. The Mo-O(THF) distance is 2.709 (6) A?. The structure of compound 2 was also solved in the triclinic space group P1 with unit cell parameters a = 12.516 (3) A?, b = 17.698 (4) A?, c = 10.214 (2) A?, α = 93.88 (2)°, β = 113.17 (2)°, γ = 71.95 (2)°, V = 2004 (1) A?³, and Z = 2. Each molecule occupies a general position within the unit cell. The Mo-Mo distance is 2.082 (1) A?, and the Mo-O distances average ～2.162 (5) A? and indicate the operation of a structural trans effect in the molecule.