Tris(3,5-di-aza-1-azonia-7-phosphaadamant-7-yl)(1,3,5-tri-aza-7-phospha-adamantane)silver(I) dicarbonate.

The title compound, [Ag(C6H13N3P)4(C6H12N3P)](CO3)2 or [Ag(PTAH)3(PTA)](CO3)2, is a discrete cationic silver(I) complex composed of one neutral 1,3,5-tri-aza-7-phosphaadamantane (C6H12N3P; PTA) ligand and three monoprotonated PTAH+ (C6H13N3P+) ligands coordinated to the silver center, resulting in an overall +4 charge balanced by two carbonate anions. The compound crystallizes in the rhombohedral R3 space group with the silver ion and PTA P atom lying on a crystallographic threefold axis, as does one of the carbonate C atoms. The silver ion adopts a tetra-hedral geometry with P-Ag-P bond angles near the ideal 109°, and silver-phospho-rus bond distances of 2.4699 (6) and 2.4683 (11) Å for Ag-PPTA and Ag-PPTAH, respectively. The crystal packing features N-H⋯O hydrogen bonds between the protonated N atoms of the PTAH ligands and the non-coordinating carbonate anions.