Electron Paramagnetic Resonance of VO2+ in M2Zn(SeO4)2 · 6H2O(M=K,Rb) Single Crystals

The EPR spectrum of VO²⁺ has been studied in single crystals of K₂Zn(SeO₄)₂ · 6H₂O and Rb₂Zn(SeO₄)₂ ∼ 6H₂O at ∼9.45 GHz. VO²⁺ substitutes for Zn²⁺ have preferential orientations in the lattice. The V = O of the intense vanadyl center is nearly along the longest Zn H₂O direction. Spin-Hamiltonian parameters have been evaluated from single crystal as well as from powder spectra.     

About Influence of Gravity on Heat Conductivity Process of the Planets

In the present study it is shown that the interaction of a quasi-static gravitational wave through density fluctuations give rise to a heat conductivity coefficient and hence rise in temperature. This fact is a very important characteristics needed to establish a heat equilibrium process of such massive body as the Earth and other Planets. To carry out this exercise, general mechanism has been provided, which makes a bridge between classical physics and quantum theory. The specific dependence of heat conductivity coefficient in wide region has also been calculated.     

First-principles density functional theory study of generalized stacking faults in TiN and MgO

In this paper, the generalized stacking fault (GSF) energies in different slip planes of TiN and MgO are calculated using highly reliable first-principles density functional theory (DFT) calculations. During DFT calculations, the issue of different ways to calculate the GSF energetics in ceramic materials containing more than one element was addressed and applied. For 〈1?1?0〉/{1?1?1} slip, a splitting of saddle point in TiN was observed. For 〈1?1?2〉/{1?1?1} slip, a stable stacking fault at a₀/3〈1?1?2〉 displacement was formed in TiN. For synchroshear mechanism where the slip was accompanied by a cooperative motion of the interfacial nitrogen atoms within the slip plane, a second stable stacking fault was formed at a₀/6〈1?1?2〉 displacement. The energy barrier for the shuffling of nitrogen atoms from one state to another is calculated to be 0.70 eV per atom. In contrast, such features are absent in MgO. These differences highlight the influence of complex bonding nature (mixed covalent, ionic, and metallic bondings) of TiN, which is substantially different than that in MgO (simple ionic bonding) on GSF shapes.     

Reductive Cleavage of Phthalides with Iodotrimethylsilane

A convenient reductive cleavage of 3-arylphthalides 1 into corresponding 2-benzylbenzoic acids and 2-(2-thienylmethyl)benzoic acid 2 by using iodotrimethyisilane is described.     

A Convenient Chiral Synthesis of 4-Alkyl-γ-butanolides

A simple three step synthesis of 4-alkyl-γ-butanolides as flavoring compounds from chiral propargyl alcohols is described.