Title of article :
Syntheses, Structures, and Magnetic Properties of Mixed-Valent Diruthenium(II,III) Diphosphonates with Discrete and One-Dimensional Structures
Author/Authors :
Liu، Bin نويسنده , , Xu، Wei نويسنده , , Zheng، Li-Min نويسنده , , Song، You نويسنده , , Chen، Jie-Sheng نويسنده , , Gao، Song نويسنده , , Yi، Xiao-Yi نويسنده , , Jimenez-Aparicio، Reyes نويسنده , , Urbanos، Francisco A. نويسنده ,
Abstract :
Four mixed-valent ruthenium diphosphonates, namely, Na4[Ru2(hedp)2X]·16H2O [X = Cl (1), Br (2)], K3[Ru2(hedp)2(H2O)2]·6H2O (3), and Na7[Ru2(hedp)2Fe(CN)6]·24H2O (4), where hedp represents 1-hydroxyethylidenediphosphonate [CH3C(OH)(PO3)2]4-, were synthesized and structurally characterized. Compounds 1, 2, and 4 show linear chain structures in which the mixed-valent [Ru2(hedp)2]3- dimers are linked by X- or [Fe(CN)6]4- bridges. Compound 3 contains discrete species of [Ru2(hedp)2(H2O)2]3- where the axial positions of [Ru2(hedp)2]3- paddlewheel are terminated by water molecules. Magnetic studies show that significant antiferromagnetic exchanges are mediated between the [Ru2(hedp)2]3- (S = 3/2) units through halide bridges in compounds 1 and 2.
