Isolation of Dithiocarbamate Anions as Salts of Bis(cyclopentadienyl)-zirconium(IV) Chelates

Abstract

A series of [cp₂ZrL]⁺[RR′NCS₂]⁻ complexes (where Lis the conjugate base of acetylacetone, benzoylacetone or 8-hydroxyquinoline (oxine) and R = CH₃, R′ = C₆H₅CH₂; R = C₂H₅, R′ = C₆H₄°CH₃; R = H, R′ = C₅H₉; RR′ = C₆H₁₂) have been synthesised in aqueous medium by the reaction of [Cp₂ZrL]⁺Cl⁻ with RR′NCS₂ ⁻Na⁺. Conductivity measurements indicate that these complexes are 1:1 electrolytes in nitrobenzene. IR and ¹H NMR spectral studies demonstrate that the ligand L is chelating in all these complexes. Consequently, tetrahedral coordination about the zireonium atom is proposed. In addition to these studies, elemental analyses and magnetic susceptibility have also been carried out for these complexes.