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In the crystal structure of the title salt, [Ag(NH 3 ) 2 ] 4 (C 7 H 6 O 7 S 2 ) 2 ·H 2 O, the four independent Ag I  complex cations all lie on special positions of  m  site symmetry, as do the two independent 2-hy­droxy-5-methyl­benzene-1,3-disulfonate anions. The Ag I  cations exist in an almost linear coordination geometry [N—Ag—N = 175.2 (2), 178.08 (16), 175.8 (2) and 178.20 (19)°]. The water mol­ecule is disordered about a mirror plane. Two independent complex cations are linked by an Ag⋯Ag inter­action of 3.3151 (1) Å, furnishing a linear [Ag(NH 3 ) 2 ]  n   polycationic chain running along  b . The free complex cations, polycationic chain and 2-hy­droxy-5-methyl­benzene-1,3-disulfonate anions inter­act  via  N—H⋯O and O—H⋯O hydrogen bonds, forming a three-dimensional network.

Tetrakis[diamminesilver(I)] bis(2-hydroxy-5-methylbenzene-1,3-disulfonate) monohydrate