Solvent-Dependent Self-Assembly of an Oxalato-Based Three-Dimensional Magnet Exhibiting a Novel Architecture

The old but evergreen family of bimetallic oxalates still offers innovative and interesting results. When (Me4N)3[Cr­(ox)3]·3H2O is reacted with MnII ions in a nonaqueous solvent, a novel three-dimensional magnet of the formula [N­(CH3)4]6[Mn3Cr4(ox)12]·6CH3OH is obtained instead of the one-dimensional compound obtained in water. This new material exhibits an unprecedented stoichiometry with a binodal (3,4) net topology and the highest critical temperature (TC = 7 K) observed so far in a manganese–chromium oxalate based magnet.