title: A three-dimensional framework structure constructed from 2-(2-pyridyl-N-oxide) ethylphosphonic acid and Nd(III).
abstract: A multistep synthesis for 2-(2-pyridyl-N-oxide) ethylphosphonic acid 6-H2 is described along with its spectroscopic (IR, NMR) data and a single-crystal X-ray diffraction structure analysis. Combination of the ligand with Nd(OH)3 results in the formation of a complex Nd(6-H)3. Single-crystal X-ray diffraction analysis reveals a three-dimensional crystal network generated by hydrogen-bonded chains along the crystallographic c axis. The hydrogen bonds are formed between phosphonic acid anion (6-H)(-1) protons on one chain and pyridyl N-oxide oxygen atoms in neighboring chains. The asymmetric unit contains 1/3[Nd(6-H)3] and there are two unique Nd(III) atoms, each with point symmetry. As a result, each Nd(III) ion is bound to six (6-H)(-1) ligands and the symmetry about the Nd(III) ion is octahedral with each vertex occupied by a phosphonate oxygen atom. The Nd-O bond lengths are essentially identical: Nd(1)-O(3), 2.336 (1) A; Nd(2)-O(4), 2.340 (1) A. The monoanionic ligand (6-H)(-1), therefore, serves to bridge the unique Nd(III) centers.
authors.affiliation: Department of Chemistry, University of New Mexico, Albuquerque, New Mexico 87131, USA.
authors.forename: Xin-Min
authors.initials: XM
authors.lastname: Gan
authors.forename: Brian M
authors.initials: BM
authors.lastname: Rapko
authors.forename: Jesse
authors.initials: J
authors.lastname: Fox
authors.forename: Iris
authors.initials: I
authors.lastname: Binyamin
authors.forename: Sylvie
authors.initials: S
authors.lastname: Pailloux
authors.forename: Eileen N
authors.initials: EN
authors.lastname: Duesler
authors.forename: Robert T
authors.initials: RT
authors.lastname: Paine