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The "Si MAS NMR spectra of the 2H, 4H, 6H, and 3C polytypes of silicon carbide are presented. An attempt is made to correlate differences in the chemical shifts with local atomic environment. The results of the analysis of the spectra of pure polytypes are used as a basis for the interpretation of the speetra of mixed polytypes and a discussion of the crystallinity and impurity levels of different samples. Carbon-13 chemical shifts obtained from spectra of the same polytypes are also tabulated. [

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Die Titelliganden (I) und (II) reagieren mit PdCl2(MeCN)2, K2PtCl4, MC13 (M: Rh, Ir, Ru) und [OsC16]2′ in CH2C12, EtOH oder 2‐Alkoxyethanol zu einer Reihe von diaund paramagnetischen Komplexen (III)‐(XIII).

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31P Fourier transform nuclear magnetic resonance spectroscopy has been used to characterise phosphorus-containing additives used in lubricants. Quantitative and qualitative data can be obtained with the use of new and used oils that have been subjected to standard Cortina and Petter W1 engine tests. The chemistry of additive degradation during engine testing is discussed in connection with recent theories of the mechanism of engine protection.