Immobilized ruthenium complexes and aspects of their reactivity

Methodologies for the immobilization and characterization of ruthenium complexes into/onto functionalized silica gel, zeolites, polymers, dendrimers, sol–gel, nano and microparticles are described. The corresponding spectroscopic, electrochemical, and photochemical properties as well as chemical reactivities are used for their characterization and study. Comparison between the reactivities of immobilized and in solution species is presented. Some biological applications are also described.     

Surface investigation of intermetallic PdGa(111)

The intermetallic PdGa is a highly selective and potent catalyst in the semihydrogenation of acetylene, which is attributed to the surface stability and isolated Pd atom ensembles. In this context PdGa single crystals of form B with (111) orientation were investigated by means of X-ray photoelectron spectroscopy (XPS), ultraviolet photoelectron spectroscopy (UPS), scanning tunneling microscopy (STM), X-ray photoelectron diffraction (XPD), and low-energy electron diffraction (LEED) to study the electronic and geometric properties of this surface. UPS and thermal desorption spectroscopy (TDS) were used to probe the chemisorption behavior of CO. The PdGa(111) surface exhibits a (1 × 1) LEED and a pronounced XPD pattern indicating an unreconstructed bulk-truncated surface. Low-temperature STM reveals a smooth surface with a (1 × 1) unit cell. No segregation occurs, and no impurities are detected by XPS. The electronic structure and the CO adsorption properties reveal PdGa(111) to be a bulk-truncated intermetallic compound with Pd-Ga partial covalent bonding.     

Single-beam thermowave analysis of semiconductors

The paper describes a new single-beam thermowave technique based on a two-frequency modulation of the laser beam used for both excitation and detection of the photothermal response in a sample. This technique provides frequency transformation to the low-frequency region and, to a certain degree, phase sensitivity without applying the lock-in detection method. This single-beam technique is proved to yield substantial evidence in the field of laser annealing of semiconductors such as the annealing threshold, the defects generated by the ultrafast solidification and the homogeneity of the laser beam applied for irradiation.     

1p hole-states in 16O and 16N and the mass dependence of the 1p spin-orbit splitting

The 1p hole strength distributions in mass 16 nuclei, measured in parallel ¹⁷O(d,t)¹⁶O and ¹⁷O(d,τ)¹⁶N experiments, exhibit differences of the effective $\text{1d}{}_{\mathrm{<mtext>5</mtext><mtext>2</mtext>}}\text{1p}{}_{\mathrm{<mtext>1</mtext><mtext>2</mtext>}}\text{and}\text{1d}{}_{\mathrm{<mtext>5</mtext><mtext>2</mtext>}}\text{1p}{}_{\mathrm{<mtext>3</mtext><mtext>2</mtext>}}$ interactions which lead to a 1p orbit splitting increasing strongly with the number of $\text{1d}{}_{\mathrm{<mtext>5</mtext><mtext>2</mtext>}}$ nucleons.