A Tetranuclear Butterfly Cluster of Molybdenum, [PPh4]2[Mo4I11]

John C. Gordon (1) , Rinaldo Poli (1)

1 University of Maryland [College Park]

Bis(tetraphenylphosphonium) undecaiodotetramolybdate, 2[PPh4]+[Mo4,I11] 2-, was obtained by treating [Mo2(MeCN)8] 4+ with PPN+I - in dichloromethane. The four Mo atoms of the anion adopt a 'butterfly' arrangement which can be viewed as a portion of an octahedron with two missing mutually cis vertices. Ten of the eleven I atoms are located at the vertices of a cube in which the ideal octahedron would be inscribed; two of them cap the two triangular faces of the Mo4 buttefly, four bridge the edges and four are terminally coordinated to the metal atoms. The eleventh I atom bridges the two 'wing-tip' metal atoms. The metal-metal distances for four edges of the butterfly wings are in the range 2.533 (3)-2.547 (3) ,Å, whereas the 'hinge' edge is slightly longer [2.688 (3) Å] and the separation between the two wing tips is 3.051 (3)Å.

Domaines: Chimie de coordination; Cristallographie

John C. Gordon, Rinaldo Poli. A Tetranuclear Butterfly Cluster of Molybdenum, [PPh4]2[Mo4I11]. Acta Crystallographica Section C : Crystal Structure Communications [1968-2013], 1995, 51 (1), pp.14-18. ⟨10.1107/S0108270194004877⟩. ⟨hal-03532533⟩