Inorganic Chemistry, Vol.35, No.5, 1185-1194, 1996
A Proposal for Positive Cooperativity in Anion-Cation Binding in Yttrium and Lutetium Complexes Based on O-Amino-Substituted Phenolate Ligands - On the Way to Coordination Polymers by Self-Assembly - Molecular-Structures of (Cllu(Oar)(3)Na) (X-Ray) and (Cly(Oar’)(3)Y(Oar’)(3)Na) (X-Ray and Y-89-NMR)
Unique hetero(poly)metallic complexes [ClM(OAr)(3)Na] (M = Lu (3a), Y (3b)) and [ClY(OAr’)(3)Y(OAr’)(3)Na] (4) containing the bis (OAr = OC6H2(CH(2)NMe(2))(2)-2,6-Me-4) and mono (OAr’ = OC6H4(CH(2)NMe(2))-2) o-amino-substituted phenolate ligands have been synthesized and characterized by NMR (H-1, C-13, and Y-89) and X-ray structure determinations (3a and 4). Crystals of 3a are triclinic, space group P (1) over bar, with unit cell dimensions a = 10.706(1) Angstrom, b = 14.099(2) Angstrom, c 18.882(3) Angstrom, alpha = 93.48(1), beta = 99.49(1)degrees, gamma = 108.72(11)degrees, and Z = 2. The chlorine, lutetium, and sodium atoms in 3a lie on a pseudo-3-fold axis (angle Cl-Lu ... Na = 177.82(5)degrees) around which the three phenolate ligands are arranged in such a way that a "propeller-like" molecule with screw-type chirality results.
Keywords:ASYMMETRIC NITROALDOL REACTIONS;1ST LITHIUM PHENOLATE;CRYSTAL-STRUCTURE;LANTHANIDE ALKOXIDES;TRINUCLEAR STRUCTURE;METAL ALKOXIDES;PRECURSORS;CHEMISTRY;BARIUM;ARYLOXIDE