Аннотация:Monocyclopentadienylzirconium(IV) and monocyclopentadienylhafnium(IV) tetrahydroborates CpM(BH4)3 were obtained by the reaction of TICp with excess M(BH4)4 (M = Zr, Hf) in benzene at room temperature. The compounds were characterized by chemical analysis and IR spectroscopy, according to which their BH4 groups are tridentate