M(H<sub>2</sub>O)(PO<sub>3</sub>C<sub>10</sub>H<sub>6</sub>OH)·(H<sub>2</sub>O)<sub>0.5</sub> (M = Co, Mn, Zn, Cu): a new series of layered metallophosphonate compounds obtained from 6-hydroxy-2-naphthylphosphonic acid
Their structures were determined by single crystalX-raydiffraction and confirmed by powderX-raydiffraction and Le Bail refinement for the powder sample. The removal of water upon heating at 250 °C was studied by thermogravimetric analysis and temperature-dependent powderX-raydiffraction. Their magnetic properties were studied by SQUID magnetometry and show antiferromagnetic behavior for the