ORGANOMETALLIC COMPOUNDS OF THE LANTHANOIDS .82. (2,5-DI-TERT-BUTYLPYRROLYL) COMPLEXES OF NEODYMIUM(III), SAMARIUM(II), AND YTTERBIUM(II) - SYNTHESIS AND X-RAY STRUCTURAL-ANALYSIS OF DIMERIC SODIUM DICHLOROBIS(2,5-DI-TERTBUTYLPYRROLYL)(TETRAHYDROFURAN)NEODYMIATE (III)

NDCl3(THF)(1,8) reacts with Na[pyr(*)] (pyr(*) = NC(4)H(2)tBu(2)-2,5) to give [(pyr(*))(2)Nd(mu-Cl)(2){Na(THF)}(2)(mu-Cl)(2)Nd(pyr(*))(2)] (1). The reactions of SmI2(THF)(2) and YbI2(THF)(2,3) with Na[pyr(*)] and NaC(5)H(3)tBu(2)-1,3 result in the formation of [(pyr(*))(2)Ln(THF)] [Ln = Sm (2), Yb (3)] and [(1,3-tBu(2)C(5)H(3))(2)Yb(THF)] (4), respectively. The H-1-, C-13-NMR and mass spectra of the new compounds as well as the X-ray crystal structure of 1 are discussed.