Two Modifications of Y2Piv6(Hpiv)6 Crystals: Synthesis and Structuresстатья
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Дата последнего поиска статьи во внешних источниках: 12 октября 2013 г.
Аннотация:Crystals of two modifications of yttrium pivalate solvate Y2iv6(HPiv)6 (Piv = (CH3)3CCOOH)
are synthesized and studied by single-crystal X-ray diffraction analysis. The 3-modification crystallizes in the monoclinic system, a = 16.394(2) Å, b = 11.948(4) Å, c = 20.352(3) Å, = 108.73(3)°, Z = 4, space group P21/n, R1 = 0.105. Crystals of the -modifications are also monoclinic, a = 21.617(4) Å, b = 36.559(4) Å, c = 29.930(4) Å, = 104.40(2)°, Z = 12, space group P21/c, R1 = 0.050. The molecular structures of crystals of the - and -modifications consist of the Y2(2-iv)4(Piv)2(HPiv)6 dimers. The Y atoms with a distorted antipris-matic coordination surrounding of the O atoms (Y–O 2.232.53 Å) are linked by four bridging bidentate piv-alate anions and form the structural fragment shaped into a distorted lantern. Monodentate Hpiv molecules par-ticipate in the formation of intramolecular hydrogen bonds with Piv ligands. Crystal structures of the - and
modifications differ in packing of the Y2iv6(HPiv)6 dimers and in centrosymmetric nature of the dimers in the structure of the -modification.