Mono- and Bis(cyclopentadienyl)hafnium(IV) derivatives with higher fatty acids

The reactions of Cp2HfCl2 with some higher monocarboxylic acids having stra ight chains, caprylic (C8H16O2), lauric (C12H24O2), myristic (C14H28O2), pa lmitic (C16H32O2), stearic (C18H36O2), and behenic (C22H44O2) acid, have be en studied in anhydrous tetrahydrofuran in 1:1 and 1:2 molar ratios, respec tively. The reaction products isolated, of types Cp2Hf(L)C1, CpHf(L)(2)Cl ( LH represents different carboxylic acids), have been characterised by condu ctivity and magnetic susceptibility measurements and spectral (infrared, el ectronic, H-1 NMR and C-13 NMR) data. The bonding of the carboxylato ligand in these complexes has been discussed and plausible structures have been e stablished.