title: Magnetism of linear [Ln3](9+) oxo-bridged clusters (Ln = Pr, Nd) supported inside a [R3PR'](+) phosphonium coordination material.
abstract: Two new isostructural phosphine coordination materials, Ln-PCM-21 (Ln = Pr, Nd), have been obtained using a tris(p-carboxylated) methyltriphenylphosphonium ligand that is formally dianionic when triply deprotonated, allowing access to materials based on uncommon metal-to-ligand ratios. The polymers of the formula [Ln3(mptbc)4]X·solv (X = Cl(-), NO3(-)) are cationic and contain unusual, linear oxo-bridged [Ln3](9+) clusters. Magnetic susceptibility data for both the Pr and Nd analogues has been compared to models based on three contrasting approaches.
authors.affiliation: Department of Chemistry, University of Texas at Austin , Welch Hall 2.204, 105 E. 24th Street A5300, Austin, Texas 78712-1224, United States.
authors.forename: Nolan W
authors.initials: NW
authors.lastname: Waggoner
authors.forename: Beau
authors.initials: B
authors.lastname: Saccoccia
authors.forename: Ilich A
authors.initials: IA
authors.lastname: Ibarra
authors.forename: Vincent M
authors.initials: VM
authors.lastname: Lynch
authors.forename: Paul T
authors.initials: PT
authors.lastname: Wood
authors.forename: Simon M
authors.initials: SM
authors.lastname: Humphrey