The syntheses of the ethyltetramethylcyclopentadienyl complexes Ru(r/s-cs Me4 Et)(CO)2 el, Co(//s -C s Me4 Et)(CO)2, and [M(rlS-c5 Mea Et)CI2 ]2 (M = Rh or It) are described; the ruthenium complex reacts with triphenylarsine to give Ru('r/S-cs Me 4 Et)(AsPh3 )(co)el. I H and 13C n.m.r, spectra, i.r. spectra and the physical properties of the compounds are discussed and contrasted with the known Cs Hs and CsMcs analogues.

Compatibility of PVC with liquid alkyltin alkylthioglycolate stabilizers was studied by thermal methods, including isothermal calorimetry of mixing, DSC, DMA, and dielectric relaxation. The enthalpy of mixing of PVC with the series of alkyltin alkyl thioglycolates was measured over the entire concentration range at ambient conditions. It was found that all tested compounds are compatible with PVC in a broad concentration range and form homogeneous mixtures. The results are discussed in terms of the superposition of glassy state and molecular interaction contributions to the enthalpy of mixing of the glassy polymer with liquid additives. The influence of organotin stabilizers on the glassy structure of PVC films was studied by means of DSC and the dielectric relaxation spectrum. The enhancement of the glassy structure of PVC by alkyltin alkyl thioglycolates is interpreted as the result of strong multi‐site molecular complexes between organotin molecules and PVC chains, which act as additional clips in the entanglement network of polymer chains.

Co2(CO)8 und Ethyltetramethylcyclopentadien reagieren in Cyclohexan zu dem Komplex (I).