A New Preparation of S4N4

Pure S4N4 is prepared by a new method from reduction of S3N3Cl3 by various metals (Hg, Cu, Sn). Realized either in an inert solvent or directly in gaseous phase the reaction is complete. The stability range of NSCl has been determined by Raman spectrometry.

Phosphorus Compounds with the VI B Group Elements

The preparation and the properties of phosphorus sulfides and selenides are reviewed.

The exact number of phosphorus sulfides and selenides has been determined from the phase diagram. Phosphorus does not react with tellurium. The ternary diagram P—S—Se shows no P—S—Se compounds. The domains of P—S and P—Se glasses has been also determined. IR and mass spectrometry show that phosphorus sulfides and selenides have a tetrahedral arrangement of P atoms close to that of white phosphorus.

Ab initio study of the lowest-lying electronic states of LuCl molecules

By using the CASSCF/MRCI methods, the theoretical electronic structure of the LuCl molecule has been investigated. These methods have been performed for 20 singlet and triplet electronic states in the representation (2s+1)Λ((±)). Calculated potential energy curves (PECs) are also displayed. Spectroscopic constants including the harmonic vibrational wavenumber ω(e) (cm(-1)), the relative electronic energy T(e) (cm(-1)) referred to the ground state, and the equilibrium internuclear distance R(e) (Å) have been predicted for all of the singlet and triplet electronic states situated below 43,000 cm(-1). Spin-orbit effects have also been taken into consideration and calculated for the lowest-lying electronic states in the representation Ω((±)).