Crystal Structures of Na3PO2S2 · 11H2O and Na3POS3 · 11H2O

Summary.  Single crystals of sodium dithiophosphate undecahydrate (Na₃PO₂S₂ · 11H₂O) and sodium trithiophosphate undecahydrate (Na₃POS₃ · 11H₂O) were grown from aqueous solution. The crystal structures of Na₃PO₂S₂ · 11H₂O (P2₁2₁2₁; a = 1248.1(1), b = 945.2(1), c = 1383.1(1) pm; R ₁ = 0.0202, wR ₂ = 0.0502) and Na₃POS₃ · 11H₂O (Pna2₁; a = 1262.0(2), b = 947.6(2), c = 1431.5(2) pm; R ₁ = 0.0720, wR ₂ = 0.1371) are related to each other in a sense that all constituting units are arranged in similar positions and with similar orientations. The geometries of the anions were determined with high accuracy; thus, the structural parameters of the POS³⁻ ₃ anion were measured for the first time. Received September 25, 2001. Accepted January 21, 2002     

The synthesis of 11a-carbathromboxane A2

The chemically stable thromboxane analog 11a-carbathromboxane A₂ ($\text{1}$) was synthesized from PGA₂ in 12 steps. 11a-Carba-TXA₂ inhibits PGH₂-induced aggregation of human platelets.     

LaMn11C2–x und PrMn11C2–x,Carbide mit gefüllter BaCd11-Struktur

LaMn₁₁C_2–x and PrMn₁₁C_2–x, Carbides with Filled BaCd₁₁ Structure The new compounds LaMn₁₁C_2–x and PrMn₁₁C_2–x were obtained by reaction of the elements in a high-frequency furnace with subsequent annealing. The compounds crystallize tetragonal, space group I4₁/amd, with Z = 4 formula units per cell. The lattice constants are a = 10.4134(4) Å, c = 6.7293(4) Å for LaMn₁₁C_2–x and a = 10.372(1) Å, c = 6.715(1) Å for PrMn₁₁C_2–x. The structure of LaMn₁₁C_2–x was determined from single-crystal diffractometer data and refined to a residual of R = 0.013 for 24 variables and 503 structure factors. The positions of the metal atoms correspond to those of BaCd₁₁. The carbon atoms fill octahedral voids formed by four Mn and two La atoms with an occupancy of 76 ± 1%. This corresponds to the formula LaMn₁₁C_1.52. The structure and chemical bonding of the compound are discussed.     

钇铝钨三元杂多配合物的合成及其表征

首次合成了钇铝钨三元杂多配合物K11[Y（AlW11H2）2]．25H2O．通过ICP，IR，UV以及XPS等测试分析，确定并表征了配合物的元素组成、结构以及Y的电子结合能；TG—DTA分析表明，标题配合物具有较高的热稳定性．研究结果表明：Y位于杂多阴离子内界，具有Keggin结构的双配化合物．     

Preparation and Characterization of Heteropoly-complex K_11[La(GaW_11O_39H_2)_2]· xH_2O

Heteropoly complexes K11[Ln(CaW 11O39H2)21 · x H2O(Ln=La, Ce, Pr, Nd, Sm, Eu, Gd, Tb, Dy ) have been prepared and analysed. Some properties such as thermal behavior, IK and UV spectra, X-ray powder diffraction, magnetic susceptibility and X-ray photoelectron spectrum have been investigated.     

Neue Komplexe Fluoride mit Ag2+ und Pd2+: NaMIIZr2F11 (MII = Ag,Pd) und AgPdZr2F11

New Complex Fluorides with Ag²⁺ and Pd²⁺: NaM^IIZr₂F₁₁ (M^II = Ag, Pd) and AgPdZr₂F₁₁ For the first time single crystals of NaAgZr₂F₁₁, NaPdZr₂F₁₁ and AgPdZr₂F₁₁ have been obtained and investigated by X-ray methods. The isotypic compounds NaM^IIZr₂F₁₁ (M^II = Ag, Pd) crystallize triclinic, spcgr. P1 ? C (No. 2) with a = 780.9, b = 570.0, c = 583.2 pm, α = 106.1°, β = 112.2°, γ = 97.9° (NaPdZr₂F₁₁), AgPdZr₂F₁₁ is monoclinic, spcgr. C2/m? C_2h (No. 12) with a = 935.1, b = 699.1, c = 780.1 pm, β = 115.7°, Z = 2 (Four circle diffractometer data, Siemens AED 2). Their structure is closeley related to the Ag₃Hf₂F₁₄-type of structure.