title: Synthesis of hybrid framework materials under "dry" hydrothermal conditions: crystal structure and magnetic properties of Mn(2)(H(2)PO(4))(2)(C(2)O(4)).
abstract: An exploration of the manganese oxalate-phosphoric acid-water system under hydrothermal conditions, and using "reagent" quantities only of water, has led to the isolation of a new mixed anion framework material Mn(2)(H(2)PO(4))(2)(C(2)O(4)). This material features continuous chains of cis edge-sharing MnO(6) octahedra, a motif which is unique among mixed phosphate-oxalate materials identified so far. These octahedral chains are linked into a three-dimensional framework via corner-sharing with H(2)PO(4) tetrahedra, with oxalate ions acting as a bis-bidentate ligand in the third direction. Magnetic susceptibility studies show that this material may be modeled as an antiferromagnetic, S = (5)/(2) Heisenberg chain, with weaker coupling between the chains.
authors.affiliation: School of Chemistry, University of St Andrews, North Haugh, St Andrews, Fife, KY16 9ST UK.
authors.forename: Zoe A D
authors.initials: ZA
authors.lastname: Lethbridge
authors.forename: Martin J
authors.initials: MJ
authors.lastname: Smith
authors.forename: Satish K
authors.initials: SK
authors.lastname: Tiwary
authors.forename: Andrew
authors.initials: A
authors.lastname: Harrison
authors.forename: Philip
authors.initials: P
authors.lastname: Lightfoot