An attempt to grow crystals of [Ir(ppy)2(vacac)], (I), from an acetone-d6 solution formed instead crystals of [(Ir(ppy) 2)2(μ-oxalato)] acetone solvate, (II), [Ir 2C11H8N)4(C2O 4)]·-1.974C3H6O, where ppy is the phenylpyridine anion and vacac is vinylacetylacetonate. Each IrIII ion in (II) is in a pseudooctahedral coordination environment, where the pyridine N atoms are trans to each other and the phenyl C atoms are trans to the O atoms of the oxalate bridging ligand. There are two crystallographically independent dimer molecules, each lying on an inversion centre. It is suggested that the oxalate ligand is formed in a series of steps initiated by the aldol condensation of acetone with vacac.
Acta Crystallographica Section E: Structure Reports Online
Department of Chemistry

DeRosa, M.C, Enright, G.D. (Gary D.), Evans, C.E.B. (Christopher E. B.), & Crutchley, R. (2005). The photodecomposition product μ-oxalato-lκ 2O,O′:2κ 2O′,O‴-bis{bis[2-(2-pyridyl)phenyl-κ 2C,N]iridium(III)}-acetone (1/1.974). Acta Crystallographica Section E: Structure Reports Online, 61(5). doi:10.1107/S1600536805008809