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