MULTIPLE-DECKER SANDWICH COMPLEXES OF LANTHANIDE-1,3,5,7-CYCLOOCTATETRAENE [LN(N)(C8H8)(M)] (LN = CE, ND, EU, HO, AND YB) - LOCALIZED IONICBONDING STRUCTURE

Organometallic lanthanide complexes of Ln(n)(C8H8)(m) (Ln = lanthanide metals of Ce, Nd, Eu, Ho, and Yb; C8H8 = 1,3,5,7-cyclooctatetraene) w ere produced by a combination of laser vaporization and molecular beam methods. The complexes having (n, m) = (n, n + 1) for it 1-5 were pro minently produced as magic numbers in the mass spectra. Using mass spe ctrometry, photoionization spectroscopy, and photoelectron spectroscop y, it is concluded that these magic-numbered complexes form multiple d ecker sandwich structures in which Ln atoms and C8H8 molecules are alt ernately piled up. The obtained spectroscopic data show that these san dwich complexes are formed through ionic bonds and are charge transfer complexes, where the Ln atoms are multiply-charged cations of Ln(k+) (k = 2 and 3) and C8H8 molecules are multiply charged anions.