Abstract
The complex [Yb(Ph2pz)3(LiOBu)]2 (1) (Ph2pz = 3,5-diphenylpyrazolate), fortuitously obtained from reaction of Yb metal with a lithium containing sample of [SnMe3(Ph2pz)] at elevated temperatures forms a centrosymmetric butoxy- and pyrazolate-bridged open box structure. Each ytterbium atom is eight coordinate with one chelating Ph2pz ligand, one μ-η2:η2 bridging pyrazolate, one μ-η2(Yb):η4(Li) Ph2pz group and two bridging butoxide ligands. Each lithium atom is unsymmetrically chelated by an η2-Ph2pz group, η4(N,C(pz)C2(Ph)) bonded by another pyazolate group, and bridged through a butoxide oxygen atom to two ytterbium atoms. The type of η4-pyrazolate coordination is unprecedented and is the first observation of interactions to a metal by the Ph rings of the Ph2pz ligand. The complex [Li(dme)3][Eu(Ph2pz)3(dme)] (2) obtained from reaction of Eu metal with the same sample of [SnMe3(Ph2pz)] in dme at room temperature is a charged separated species with the first anionic pyrazolatolanthanoidate(II) complex in which europium is eight coordinate with three chelating Ph2pz ligands and a chelating dme.
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