Stephen P. Summers, K. Abboud, W. Brey
Jun 1, 1996
Citations
0
Influential Citations
4
Citations
Journal
Polyhedron
Abstract
The synthesis, crystal structure, and 89Y, 13C, and 1H NMR spectra of tetraaqua[2,6-diacetylpyridinedi(acetic acid hydrazone)]yttrium(III) nitrate trihydrate, [Y(H2dapaah)(H2O4)4]3+ 3NO−3·3H2O (1). the first reported complex of YIII with a planar pentadentate ligand is presented. The YIII ion coordinates to the pyridyl nitrogen, the two hydrazone nitrogens, and the two carbonyl oxygens of the pentadentate ligannd and three water molecules above and one below the ligand plane to give a nine-coordinated complex. The geometry around the YIII is a slightly distorted tricapped trigonal prism. The 89Y chemical shift was determined to provide additional data on the relationship of the chemical shift to the coordination polyhedron for Y complexes since 89Y NMR has been suggested as a probe for biological systems. The 89Y spectrum shows a peak at + 1.53 ppm from the YCl3 standard, one of the smallest chemical shifts relative to the standard reported to date and is the first example where the YIII is coordinated to a neutral ligand.