Die Kristallstruktur von Bortriiodid,BI3

Crystal Structure of Boron Triiodide, BI₃ Boron triiodide as a micro‐crystalline powder was obtained after sublimation of the reaction product of NaBH₄ and iodine. An X‐ray powder diagram of the temperature‐, air‐, and light‐sensitive compound was collected at –73 °C. According to the results of the Rietveld refinement, the crystal structure of BI₃ is isotypic to that of BCl₃ (space group P6₃/m, no. 176, a = 699.09(2), c = 736.42(3) pm). The B–I bond length was determined to be 211.2(8) pm.     

β-Homoalanyl PNAs: Synthesis and Indication of Higher Ordered Structures

Self-pairing complexes with extraordinarily high stability are formed by β-PNAs with four to six units of the nucleo-β-amino acid 1 . The key step in the synthesis is a Mitsunobu reaction between a β-homoserine and a purine derivative.     

2,4,6,8-Tetracyanoazulene: A New Building Block for “Organic Metals”

Simply mixing solutions of the title compound 1 and tetrathiafulvene (TTF) in acetonitrile provides the charge-transfer complex 2 . Here, 1 functions as a novel electron acceptor and is present in the complex as a radical anion. An electrical conductivity of up to 3 S cm⁻¹ was determined for 2 with a two-point powder measurement.     

Living and Controlled Anionic Polymerization of Methacrylates and Acrylates in the Presence of Tetraalkylammonium Halide–Alkylaluminum Complexes in Toluene

The size of both the cation and the anion of added NR₄X influences the rate of living polymerization of acrylates and methacrylates with alkylaluminum compounds. This controlled reaction, which occurs near to room temperature, provides unimodal polymers with narrow molecular-weight distributions. The complex shown to the right is suggested as a possible active species. R=Me, Et, nBu; R′=Me, Et; X=Cl, Br, I.     

Numerical experiments with parallel two‐step W‐methods for DAEs

We study the numerical behavior of parallel two‐step W‐methods (PTSW methods) applied to index 2 and index 3 DAE test‐problems. In this experiments we do not observe an order reduction in the differential components of the solution and we obtain the same orders as in the ODE and index 1 case. Our methods perform comparably with RADAU for the test‐problems in sequential computations and superior in parallel mode. We conclude that PTSW methods are an interesting choice for solving DAEs, at least up to index 2.     

[{Cp*(OC)2Re}2(μ‐POH)], ein Zweikernkomplex mit einem verbrückenden Hydroxiphosphiniden‐Liganden

[{Cp*(OC)₂Re}₂(μ‐POH)], a Dinuclear Complex with a Bridging Hydroxiphosphinidene Ligand The reaction of [{Cp*(OC)₂Re}₄(μ₄‐η¹ : η¹ : η¹ : η¹‐P₂)] ( 1 ) with 0.1 m HCl gives [{Cp*(OC)₂Re}₂(μ‐POH)] ( 2 ), the X‐ray crystal structure of which reveals a dinuclear rhenium complex with a μ‐POH (hydroxiphosphinidene) ligand.     

Crystal field and low energy excitations measured by high resolution RIXS at the L3 edge of Cu, Ni and Mn

Resonant inelastic x-ray scattering in the soft x-ray regime has been profiting much from technical advances that have lowered considerably the instru- mental linewidth. At the ADRESS beam line of the Swiss Light Source the SAXES spectrometer can be used to measure RIXS spectra at the L edges of the 3d transition metals with unprecedented energy resolution, of the order of 100 meV for Mn, Ni and Cu. We present here some preliminary spectra on CuO, malachite, NiO, NiCl₂, MnO and LaMnO₃. The dd excitations are very well resolved allowing accurate experimental evaluation of 3d state energy splitting. The low energy scale becomes accessible opening the way to the study of collective excitations in strongly correlated electron systems, like magnons and orbitons.