1,5-Dimethyl-2,3,3,4-Tetrachloro-1,5-Diaza-2,4-Diphosphorinan-6-One and some derivatives

A synthesis of C-chlorinated analogues of 1,5-diaza-2,4-diphosphorinan-6-ones is described. The P-chlorophosphine 3 , a key compound for all reported substitution reactions, reacts in an unusual way with N,N′-dimethyl-N,N′-bis(trimethylsilyl)urea to give the unsymmetrical product 5 , the formation of which is accounted for by a silatropy of the intermediate compound 4 . Compound 5 is stable in solution but rearranges quantitatively into isomer 6 without solvent at room temperature. Compound 3 , its fluoro derivative 9 , and the alkoxy derivatives 10a–d exist as cis-and trans-isomers. Some stereochemical aspects, as well as the possibility of 1,2-chlorotropy, are discussed.     

微乳液的热力学性质 I: 芳烃类的侧链链长对微乳液热力学函数影响

本文研究以非离子型表面活性剂-正辛醇-水-芳烃类所组成的微乳液, 探讨醇从油相转移到界面相时的自由能变化, 以及温度对自由能的影响。计算出熵和焓的变化, 发现在实验范围内, 上述热力学函数的对数值与芳烃侧链的碳原子数(n)呈线性关系。这些关系式对微乳液的构成和稳定性的讨论是重要的, 还对几种芳烃异构体所构成的微乳液的热力学函数进行了实验和讨论。     

Photoemission on a Cu-Zr glassy metal

In this paper we present a study of XPS, UPS and magnetic susceptibility on Cu₆₀·Zr₄₀ glassy metal. Our results can be understood in a band structure where the zirconium “d” levels lie close to the Fermi level meanwhile copper “d” levels are at higher binding energies; the density of states at the Fermi level is comparable to that of pure zirconium.     

Surface effects on Sm valence in amorphous Sm alloys

We present the results of XPS and X-ray absorption measurements performed on the amorphous Sm Au and La Sm Au compounds. The XPS Sm 3d$\text{5}\text{2}$ core level spectra in these compounds reveal that at the surface (5 ? 7 Å) the samarium ions present both the Sm²⁺ (4f⁶) and Sm³⁺ (4f⁵) configurations. When the concentration in samarium decreases it is shown that the Sm²⁺ configuration is strongly enhanced at the surface whereas the X-ray absorption measurements indicate on the contrary that in the bulk only the Sm³⁺ configuration is present. Comparison is made with similar findings in pure crystalline Sm and various crystalline rare earth compounds.