Evidence for a two-phonon octupole vibrational state in208Pb

Collective properties of^206,208Pb have been investigated with gamma-ray spectroscopy using nuclear and electromagnetic excitation by²⁰⁸Pb projectiles. From the measurement of particle-particle- and particle-particle- coincidences a new energy level in²⁰⁸Pb at 5.683 MeV was observed and the data suggest an interpretation as a 2-phonon octupole vibrational state with spin 4⁺ or 6⁺. For this state one finds the same dynamical deformation parameter ₃ as for the first-excited collective 3^– state. The results are compared to predictions of models which consider, in particular, the aspects of the quadrupole interaction and the interaction of the 2-particle pairing vibration with the 2-phonon octupole vibration. For the²⁰⁶Pb+²⁰⁸Pb system at 6.2 MeV/u the nuclear potential could be determined from the measured inelastic cross sections.Dedicated to Prof. Dr. P. Kienle on the occasion of his 60th birthday     

Selected properties of bi- and trinuclear complexes prepared by the reactions of Ru3(CO)12 with β-substituted oxadienes

The reactions of Ru₃(CO)₁₂with 4-phenylbut-3-an-2-ine (1a), 3-phenyl-1-p-tolylprop-2-an-1-ine (1b), and 1,3-diferrocenylprop-2-an-1-ine (1c) afforded the Ru₂(CO)₆(-H)(O=C(R¹)C(H)=C(R²)) (2) and Ru₃(CO)₈(O=C(R¹)C(H)=C(R²))₂(3) complexes. Dissolution of these complexes in CHCl₃or CH₂Cl₂gave rise to the Ru₂(CO)₄(-Cl)₂(O=C(R¹)C(H)=C(R²)) complexes (4). The thermal transformations of complexes 2and 3in the presence of an excess of the ligand yielded the Ru₂O₂(CO)₄(³-OC(R¹)C(H)(CH₂R²)C(R²)C(H)C(R¹))₂(5) and Ru(CO)₂(O=C(R¹)C(H)=C(R²))₂(6) complexes. Analogous complexes were obtained upon more prolonged heating of the starting reaction mixtures. The structures of complexes 4a, 5a, and 6cwere established by X-ray diffraction analysis and confirmed by spectroscopic data.     

Copper(I) Complexes with Electron Deficient μ3-PRR′ Bridging - a Novel Coordination Mode of Secondary Phosphido Groups in Transition Metal Chemistry

Abstract

Copper(1) phosphido complexes containing electron deficient μ₃-PRR′ bridges are formed by P-Si cleavage reactions in silylphoshines with CuCl or by depolymerization of polymeric [Cu(PPh₂)]_n with PMe₃ or PMe₃/CuCl.     

Contact bactericides and fungicides on the basis of amino‐functionalized poly(norbornene)s

This study is aimed at investigating the microbiocidal potential of amino‐functionalized poly(norbornenes) in the solid state. A series of norbornene‐type monomers that carry secondary or tertiary amine functions as well as hexyl and dodecyl groups were prepared. Ring‐opening metathesis polymerization was used to prepare homopolymers of the amine bearing monomers and random copolymers of amine‐ and alkyl‐substituted monomers of high average molar mass. The resulting polymers were characterized by nuclear magnetic resonance, thermogravimetry, differential scanning calorimetry, infrared spectroscopy, and contact angle measurements, and their contact biocidal potential was evaluated according to the Japanese Industry standard Z2801. Tested microorganisms comprised Pseudomonas aeruginosa, Escherichia coli, Staphylococcus aureus, Candida albicans, and Aspergillus niger. Microbiocidal activity of selected polymer films against E. coli, S. aureus, and A. niger was found, whereas against C. albicans and P. aeruginosa microbiostatic behavior was observed. Moreover, the most potent copolymer revealed no cytotoxicity rendering a biocidal polymer with potential applications in mammalian‐, and in particular, human‐related fields. © 2010 Wiley Periodicals, Inc. J Polym Sci Part A: Polym Chem, 2010     

Resolution improvement by nonconfocal theta microscopy

We present a novel scanning fluorescence microscopy technique, nonconfocal theta microscopy (NCTM), that provides almost isotropic resolution. In NCTM, multiphoton absorption from two orthogonal illumination directions is used to induce fluorescence emission. Therefore the point-spread function of the microscope is described by the product of illumination point-spread functions with reduced spatial overlap, which provides the resolution improvement and the more isotropic observation volume. We discuss the technical details of this new method.