Magnetic properties of two double-layer structures built from hydroxynaphthoic acids and manganese.
Double-layer structures consisting of alternating polar and non-polar layers have been prepared using Mn2+ ions and o-hydroxynaphthoic acids. The polar layers contain the Mn2+ ions, carboxylate groups, hydroxy groups and water molecules. The non-polar layers are built up from the naphthalene moieties. In catena-poly[[diaquamanganese(II)]bis(mu-3-hydroxy-2-naphthoato-kappa2O:O')] (also called manganese 3-hydroxy-2-naphthoate dihydrate), [Mn(C11H7O3)2(H2O)2]n, (I), the Mn2+ ions are connected by carboxylate groups to form two-dimensional networks. This compound shows distinct antiferromagnetic interactions and long-range ordering at low temperature. In contrast, tetraaquabis(1-hydroxy-2-naphthoato-kappaO)manganese(II), [Mn(C11H7O3)2(H2O)4], (II), which lacks a close linkage between the Mn2+ ions, reveals purely paramagnetic behaviour. In (II), the Mn2+ ion lies on an inversion centre.
Institut für Anorganische und Analytische Chemie, J. W. Goethe-Universität Frankfurt, FOR 412, Marie-Curie-Strasse 11, 60439 Frankfurt am Main, Germany.
Martin U
MU
Schmidt
Edith
E
Alig
Lothar
L
Fink
Michael
M
Bolte
Robin
R
Panisch
Volodymyr
V
Pashchenko
Bernd
B
Wolf
Michael
M
Lang