| Abstract |
Samarium complexes supported by the diamine bis(phenol) proligand H-2((O2NN)-O-tBu2 ) = Me2N(CH2)(2)-N\CH2-(2-OH-3,5-Bu-t(2)-C6H2)(2)\ were prepared and structurally characterized. [Sm((O2NN)-O-tBu2 )](2)(mu-Cl)(2) (1) was obtained from reaction of SmCl3 with K-2((O2NN)-O-tBu2 ) in THF, DME or pyridine. The reaction of 1 with LiNEt2 gave a zwitterionic bimetallic complex of Sm and Li, [Sm((O2NN)-O-tBu2 )(2)Li] (2) that formed upon ligand redistribution and did not allow the isolation of the expected diethylamido derivative. Analogously treatment of Sm\N(SiMe3)(2)\(3) with H-2 (O2NN)-O-tBu2 led to a zwitterionic samarium complex [Sm((O2NN)-O-tBu2 )((O2N)-O-tBu2(H)N )] (3) that also displays a 2ligand: 1Sm ratio. In 3 the samarium is formally an ate centre and the tripodal nitrogen of one of the ligands is protonated. The reaction of 1 with Li[2-(CH2NMe2)C6H4] proceeded through chloride metathesis to give [Sm((O2NN)-O-tBu2 )(kappa(2)-\2-(CH2NMe2)-C6H4\)] (4). (C) 2013 Elsevier B.V. All rights reserved. |
