Novel Layered Ruthenium Diphosphonate Containing a Mixed Valent Diruthenium Paddlewheel Core

This paper reports the synthesis and crystal structure of a novel mixed valence ruthenium(II,III) compound, (NH4)3Ru2(hedp)2·2H2O (1), where hedp represents 1-hydroxyethylidenediphosphonate. It has a two-dimensional structure in which the paddlewheel diruthenium(II,III) units of Ru2(hedp)2 are cross-linked through the phosphonate groups. The layers are stacked along the [100] direction with strong intra- and interlayer hydrogen bonds. Primary magnetic results are presented.