Melamine-induced synthesis of a structurally perfect kagomé antiferromagnet.

We report here a structurally perfect kagomé lattice {[Cu 3 (bpy) 6 ](SiF 6 ) 3 (melamine) 8 } n (1), where bpy is 4,4'-bipyridine and [SiF 6 ] 2- is a hexafluorosilicate anion. In comparison to general 1D linear, 2D layered and 3D cubic metal-organic frameworks, by using Cu 2+ nodes and bpy ligands, a perfect kagomé lattice was synthesized by introducing C 3 symmetrical melamine molecules. Magnetic susceptibility and low-temperature heat capacity measurements indicated weak antiferromagnetic interactions between the spins and no long-range magnetic ordering to 0.7 K. Using C 3 symmetrical melamine molecules can be considered as a challenging synthetic strategy to afford new topological materials.