Abstract
Crystals of two modifications of yttrium pivalate solvate Y2Piv6(HPiv )6(HPiv = (CH3)3CCOOH) are synthesized and studied by single-crystal X-ray diffraction analysis. The 3α-modification crystallizes in the monoclinic system, a = 16.394(2) A, b = 11.948(4) A, c = 20.352(3) A, β = 108.73(3)°, Z = 4, space group P21/n, R 1 = 0.105. Crystals of the β-modifications are also monoclinic, a = 21.617(4) A, b = 36.559(4) A, c = 29.930(4) A, β = 104.40(2)°, Z = 12, space group P21/c, R 1 = 0.050. The molecular structures of crystals of the α-and β-modifications consist of the Y2(μ2-Piv)4(Piv)2(HPiv)6 dimers. The Y atoms with a distorted antiprismatic coordination surrounding of the O atoms (Y-O 2.23–2.53 A) are linked by four bridging bidentate pivalate anions and form the structural fragment shaped into a distorted lantern. Monodentate Hpiv molecules participate in the formation of intramolecular hydrogen bonds with Piv ligands. Crystal structures of the α-and β-modifications differ in packing of the Y2Piv6(HPiv)6 dimers and in centrosymmetric nature of the dimers in the structure of the α-modification.
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