Half-sandwich pyrazolylborate complexes of the lanthanides: the molecular structures of [Yb{HB(3-But-5-Me-pyrazolyl)3}I(thf)] and [Yb{HB(3But-5-Me-pyrazolyl)3}I-(3,5-lutidine)2]

Abstract

Reaction of Ybl₂ with 1 equiv. of K[HB(3-Bu^t-5-Me-pyrazolyl)₃] gives the ether-soluble complex [Yb{HB(3-Bu^t-5-Me-pyrazolyl)₃}I(thf)], 1, in good yields; complex 1 reacts with good donor ligands to give simple adducts [Yb{HB(3-Bu^t-5-Me-pyrazolyl)₃}I(3,5-Iutidine)₂]2 and [Yb{HB(3-Bu^t-5-Me-pyrazolyl)₃}I(tert-butylisonitrile)]3; complexes 1 and 2 have been strcturally characterized.