Synthesis and characterization of biscyclopentadienyllanthanide benzothiazole-2-thiolates. X-ray crystal structures of Cp(2)Ln(SBT)(THF) (Ln=Yb, Dy)

Cp(3)Ln (Cp=C5H5, Ln=Yb, Dy, Sm, Y) reacts with an equimolar amount of 2-me rcapto-benzothiazole (HSBT) in THF at room temperature to give Cp(2)Ln(SBT) (THF) [Ln=Yb(1), Dy(2), Sm(3), Y(4)]. All these complexes have been charact erized by elemental analysis, IR and MS spectra, indicating they are solvat ed monomeric structures. The crystal structural analysis shows that in comp lexes 1 and 2 each lanthanide ion is coordinated by two (5)-cyclopentadieny l groups, one oxygen atom of THF, one sulfur and one nitrogen atoms from th e chelating benzothiazole-2-thiolate ligand to form a distorted trigonal-bi pyramidal geometry with coordination number nine. The Ln-S bond length is t he longest value found in organolanthanide complexes containing the Ln-S bo nd up to now. (C) 1999 Elsevier Science Ltd. All rights reserved.