Charge transfer salts of the lanthanides: the crystal structure of [Yb(Tp(Me,Me))(2)][TCNE]center dot(THF)(6)

The reaction of [Ln(Tp(Me,Me))(2)] (Ln = Sm, Eu, Yb) with TCNE and TCNQ gave good yields of the expected salt [Ln(Tp(Me,Me))(2)]Y (Y = TCNE, TCNQ) as a THF solvate. The crystal structure of [Yb(Tp(Me,Me))(2)][TCNE]. (THF)(6) was determined and shows the expected salt-like formulation, but shows no significant interionic contacts. The reactions with TCNQ produced less well-defined products with evidence for interionic contacts. (C) 2001 Elsevier Science B.V. All rights reserved.