Spin-frustrated organic-inorganic hybrids of lindgrenite

We report the syntheses and magnetic properties of hybrid organic-inorganic materials that represent layer-expanded versions of the rare mineral lindgrenite (Cu3(OH)2(MoO4)2). The structures of these compounds feature one-dimensional chains of alternating corner- and edge-sharing Cu(II) triangles. By expanding the inorganic layers of lindgrenite with 4,4′-bipyridine, spin-frustrated antiferromagnetism is revealed by a change of the spin frustration parameter f from 1.2 in lindgrenite to 19.4 in (4,4′-bpy)Cu3(OH)2(MoO4)2. Copyright © 2005 American Chemical Society.