Redetermination of the crystal structure of di­methyl­bis­­[2,4-penta­nedionato(1−)-κ2O2,O4]tin(IV)

The redetermination of the title compound, [Sn(CH3)2(C5H7O2)2] or SnMe2(acac)2, from CCD data recorded at 100 K basically confirms the previous study based on integrated film data recorded at room temperature [Miller & Schlemper (1972[Miller, G. A. & Schlemper, E. O. (1973). Inorg. Chem. 12, 677-681.]). Inorg. Chem. 12, 677–681], but reveals a remarkable shrinkage of the a axis [7.12 (1) > 6.7694 (4) Å]. The mol­ecule belongs to point group Ci with the SnIV atom on a centre of inversion. The SnIV atom shows a slightly distorted octa­hedral coordination sphere with the methyl groups in trans positions and a Sn—C bond length of 2.115 (2) Å which may serve as a standard value for an Sn—CH3 bond of an octa­hedrally coordinated SnIV atom. The Sn—O bonds involving the two carbonyl groups of the acetyl­acetonate ligand are of equal length [2.180 (1) and 2.183 (1) Å], as are the C=O [1.273 (1) and 1.274 (1) Å] and C—C bond lengths [1.393 (2) and 1.400 (2) Å]. The acetyl­acetonate ligand deviates considerably from planarity, with a dihedral angle of 5.57 (9)° between the least-squares planes of the two acetone moieties. The four O atoms of the two symmetry-related acetyl­acetonate ligands are arranged in a nearly quadratic rectangle. Weak C—H⋯O inter­actions consolidate the crystal packing.