BULKY ORTHO 3-METHOXY GROUPS ON N4O3 AMINE PHENOL LIGANDS PRODUCING 6-COORDINATE BIS(LIGAND)LANTHANIDE COMPLEX CATIONS [LN(H3L)2]3+ (LN = PR, GD H3L = TRIS(((2-HYDROXY-3-METHOXYBENZYL)AMINO)ETHYL)AMINE)

{The synthesis and characterization of an N4O3 amine phenol (tris(((2-hydroxy-3-methoxybenzyl)amino)ethyl)amine, H3L4) and its lanthanide complexes [Ln(H3LA)(NO3)3] (Ln = Pr, Nd) and [Ln(H3L4)2](NO3)3 (Ln = Pr, Nd, Gd, Yb) are reported. The N4O3 amine phenol ligand is the KBH4 reduction product of the Schiff base derived from the reaction of tris(2-aminoethyl)amine (tren) and 3 equiv of o-vanillin. The reactions of lanthanide nitrates with 1 equiv of H3L4 produce nine-coordinate type II complexes, [Ln(H3L4)(NO3)3] (Ln = Pr, Nd), in which H3L4 acts as a tridentate O3 ligand and six-coordinate bis(ligand) type IV complexes, [Ln(H3L4)2](NO3)3 (Ln = Gd, Yb). The latter were prepared from the reactions of lanthanide nitrates with 2 equiv of H3L4 in the presence of sodium hydroxide. The X-ray crystal structures of [Ln(H3L4)2](NO3)3.xH2O.YMeOH (Ln = Pr