ISOLATION AND STRUCTURAL CHARACTERIZATION OF TETRA- AND PENTAHETEROMETALLIC NEODYMIUM 4-METHYLPHENOXIDE COMPLEXES

摘要

The compatibility of the special bridging abilities of the 4-methylphenoxide ligand, OC6H4Me-4, and alkylaluminum reagents have been examined. NdCl3 reacts with KOC6H4Me-4 in THF to form K3Nd2 (mu-OC6H4Me-4)(6)(mu(4)-OC6H4Me-4)(3)(THF)(7), 1, which has a trigonal bipyramidal arrangement of metal atoms with neodymium in the apical sites. Six doubly-bridging aryloxide ligands connect each apical metal to an equatorial metal and three quadruply-bridging aryloxide ligands connect the apical metals with two equatorial sites. Two potassium atoms have two terminal THF ligands and the other metals each have one terminal THF. A suspension of 1 in hexanes reacts with Al2Me6 to produce colorless crystals of [Me2Al(OC6H4Me-4)](n) and blue crystals which have been crystallographically characterized as Nd[mu OC6H4Me-4)(2)AlMe2](3), 2. The neodymium atom in 2 is surrounded by an octahedron of bridging aryloxide ligands and each aluminum is tetrahedral. (C) 1997 Elsevier Science Ltd. [References: 32]