Zirconium-91 nuclear magnetic resonance spectroscopy: the first chemical study

Abstract Zirconium-91 NMR signals have been observed for the series Cp 2 ZrX 2 (X = Cl, Br, I) and ZrX 2− 6 (X = F, Cl) ions, and an inverse halogen dependence has been found. The Carbon-13 NMR of the fluxional molecule Cp 4 Zr is also reported.