Fe(II)C2H5PO3. H2O has been prepared via
prolonged reaction between iron oxychloride and ethylphosphonic acid in
acetone, in a sealed tube. The lamellar structure is very similar to that of
previously reported divalent metal phosphonates M(II)(RPO3).
H2O (M= Mg, Mn, Ni, Zn). The compound shows sign of 2D
antiferromagnetic correlations above the Néel temperature Tn=24K
and a weak ferromagnetic behavior is observed below TN. We also
report on the preparation methods and the crystal structures of two new
anhydrous copper phosphonates
a-Cu(II)(C2H5PO3), and
β-Cu(II)(CH3PO3) which exhibits an original tubular
three-dimensional structure. The reactivity of bulky phosphonic acids is
also described, with the case of
Co(II)(t-C4H9PO3).H2O.