Solvent-free synthesis of new metal phosphate-oxalates: influence of different metal ions on the framework structures.

A series of new metal phosphate-oxalates were synthesized under solvent-free conditions. These compounds display interesting open-framework structures with mmt, ins, fsd, and hcb topologies, respectively. The extra-large 20-ring channel, nanobelt-like inorganic skeleton, and the use of cadmium ions as framework cations are unprecedented in metal phosphate-oxalate structures.