N(CH3)4 · ZnH3(PO4)2: A Large‐Pore Zincophosphate Built Up from a 12‐Ring Architecture with a Remarkably Low Tetrahedral‐Framework‐Atom Density

An open framework structure built up from tetrahedral building blocks characterizes the zincophosphate N(CH3)4 · ZnH3(PO4)2. Its topology is based on 12-rings (depicted on the right) that form a pearshaped cavity occupied by tetramethylammonium ions. N(CH3)4 · ZnH3(PO4)2 has the lowest framework density yet observed in microporous materials built up from tetrahedral building blocks.