Crystal structures of isomorphous triaquatris- (3-aminobenzoato-O,O)yttrium(III) trihydrate and triaquatris(3-aminobenzoato-O,O)lanthanide(III) trihydrate

Abstract

The space group and unit cell parameters of yttrium(III) and lanthanide(III) 3-aminobenzoate hexahydrate crystals have been determined. All compounds have the formula [M(C 7 H 6 N0 2 ) 3 · 3H 2 0] · 3H 2 0 and their crystals are isomorphous in the non-centrosymmetric trigonal space group R3c. Crystal structures of three of these salts have been deters mined: Y(III), Er(III) and Lu(III). The structures consist of the metal cation coordinated by water molecules, bidentate chelating 3-aminobenzoate anions, and crystallization water. The metal coordination polyhedron, with crystallographically imposed threefold symmetry axis, is formed by nine oxygen atoms: six of carboxylate groups and three of water molecules. The Brought to you by | University of California Authenticated Download Date | 6/9/15 2:47 PM Anna Ε. Koziol et al. crystal structure is stabilized by interligand hydrogen bonding between water molecules and either carboxylate or amino groups.

Two 3-aminobenzoates of praseodymium, Pr(OOC-Ph-NH2)3(H2O) and Pr(OOC-Ph-NH2)(OOC-Ph-NH)

“…There are a number of rare-earth 3-amino-benzoatetrihydrates, [M(OOC-Ph-NH 2 ) 3 (H 2 O) 3 H 2 O) 3 known, M = LaLu, Y [6] which have monomeric structures with three bidentate carboxylic ligands and three coordinating water molecules constituting a tricapped trigonal prism of oxygen atoms around M 3+ .…”