Synthesis and molecular structure of the first inorganic quadruply-bridged Ir(II) dimer (Ir-Ir)

F. Albert Cotton (1) , Rinaldo Poli (1)

1 Texas A&M University [College Station]

Interaction of (COD)Ir(μ-form)2Ir(OCOCF3)2(H2O) (COD = 1,5-cyclooctadiene; form = N,N′-di-p-tolylformamidinate ion) with two equivalents of Hform in toluene affords Ir2(form)4, the first inorganic Ir(II) dimer to be crystallographically characterized. The reaction involves a formal electron redistribution from a dative Ir(I) → Ir(III) to a covalent Ir(II)-Ir(II) bond. The compound crystallizes in the cubic space group Pn3n with a = 21.300(9) Å. The metal-metal separation, 2.524(3) Å, is the shortest ever reported for a bonding interaction between iridium atoms.

Domaines: Chimie de coordination

F. Albert Cotton, Rinaldo Poli. Synthesis and molecular structure of the first inorganic quadruply-bridged Ir(II) dimer (Ir-Ir). Polyhedron, 1987, 6 (7), pp.1625-1628. ⟨10.1016/S0277-5387(00)80851-7⟩. ⟨hal-03545036⟩