Dedicated to Prof. Dr. h. c. H. Behrens on his 65th birthday The interaction of (^-CsHsfeMC^ (M = Zr, Hf) with excess CH2-PPh3 in THF gives (??5-C5H5)2MCl(CH-PPh3) as yellow orange needles. Nuclear magnetic resonance spectra show hindered rotation about the P-C bond with = 8.6 kcal/mole for M = Zr and 8.3 kcal/mole for M — Hf, respectively. The X-ray molecular structure of the zirconium complex...

In this paper a résumé is given on nmr studies of paramagnetic molecules with specific reference to manganic and ferric dithiocarbamates. The temperature dependence of these spectra is discussed, and the isotropic proton hyperfine interaction constants are examined, yielding information about the electronic configuration in these molecules. The nmr results are complemented by magnetic susceptib...

This paper presents a new mathematical technique for the identification of two rheological model functions (namely, the hindered settling and effective solid stress functions) obtained from concentration profiles measured during the centrifugation of flocculated suspensions. We consider both a rotating tube and a basket centrifuge at a given angular velocity, and assume that the radius (i.e., t...

9,10-Dibromo-anthracene was lithiated once or twice, and the products were reacted with different sulfurdiimides. The reactions yielded [(THF)2Li(NBu)2SAnBr] (1), [(Et2O)(LiBr)Li(NBu)2SAnBr]2 (2), [Me2Al(NBu)2SAnBr] (3), [{(THF)2Li(NR)2S}2An] (4: R = tBu; 5: R = SiMe3) and [{Me2Al(NSiMe3)2S}2An] (6). All products were fully characterized by X-ray structure analysis, elemental analysis, NMR and ...

The ultimate goal of this research was to develop a greater understanding of the structural components needed to describe transport within the glomerular basement membrane (GBM). Specifically, dimensionless diffusive and convective hindrance factors were investigated by measuring macromolecular permeability through synthetic, two-fiber, agarose-dextran hydrogels at very small or very high Pe, r...