含磷五元环五配位化合物的合成

三配位磷化物与烷氧基苯硫醚反应合成了一系列含磷五元环的五配位化合物。在不同温度下,测定了这些化合物的¹⁹FNMR。化合物(7)与三氟乙氧基苯硫醚反应生成化合物(19)以及(20)和(21);化合物(11)与六氟异丙氧基苯硫醚反应生成化合物(18)和(21),并对这些反应机理进行了讨论。     

Electronic spectra and structure of the hydrogen halides: Characterization of the electronic structure of HI lying between 67 800 and 74 400 cm−1 above X1Σ+

High-resolution absorption spectra of HI were reinvestigated in the 1475-Å (67 800 cm^?1) to 1344-Å (74 400 cm^?1) region. This spectral region was found to contain bands attributable to (1) V¹Σ⁺-X¹Σ⁺(v′-0) with v′ > 0, (2) (v′-0) transitions with v′ ≥ 0 from X¹Σ⁺ to states associated with the (σ²π³)cπ and (σ²π³)cσ configurations, and (3) (v′-0) transitions with v′ ≥ 0 from X¹Σ⁺ to states associated with the previously unreported configurations (σ²π³)dσ, dπ, aδ, eσ, and fσ.     

Statistical inference for a certain class of bivariate distributions

The paper deals with statistical inference for a certain class of bivariate distributions. The class of marginal distributions is given and is shown to include distributions with only location and scale parameters. A normalizing transformation is applied to the marginal distributions and the parameters are estimated by maximum likelihood. For this class there is a great deal of simplification in the calculations for the asymptotic covariance matrix of the vector of parameter estimators. Statistics for tests of zero correlation are discussed. Also, the analysis is carried out for exponential marginal distributions.     

Shapes of the neutron-rich 88-94Kr nuclei

Neutron-rich, ^88-94Kr nuclei, populated in spontaneous fission of ²⁴⁸Cm, have been studied with EUROGAM 2, by measuring prompt γ-rays. Many new excited states in even-even Kr isotopes have been identified. For the first time spins and parities were determined experimentally in these nuclei. Our results indicate that the quadrupole deformation of Kr isotopes will appear only above N = 58, as observed in Sr and Zr nuclei. The newly found 3^- level at 1506.4 keV in ⁹⁰Kr suggests the exsistence of a new region of increased octupole correlations, probably associated with the ν(d _5/2 h _11/2) pair of Δl = Δj = 3 orbitals. Received: 18 September 2000 / Accepted: 18 October 2000     

On the multivalence and order of starlikeness of a class of meromorphic functions

Basically this paper deals with the determination of the radius of starlikeness and radius of univalence of the class of meromorphic functions of the formg(z)=A/z−Φ(z) forA>0, and where Φ(z) is an analytic function defined in the unit disk whose modulus does not exceed unity. We estimate the radius ofp-valence of functions having the fromh(z)=Φ(z)+a/z ^p fora>1,p≧1, and also estimate the radius of starlikeness of certain Blaschke products which is also given as a function of the minimum modulus function. We discuss the question of sharpness of the results and mention some open problems.