Mono‐ and Dimethyl‐1,2,4‐Triazolate as Ligands for the Mercuric Ion in the Cationic Three‐dimensional Coordination Polymer of [Hg 2 (Mmt)(Dmt) 2 ](NO 3 )(H 2 O)

Colourless crystals of [Hg 2 (Mmt)(Dmt) 2 ](NO 3 )(H 2 O) were obtained from a reaction of mercuric nitrate with monomethyl‐ and dimethyl‐1,2,4‐triazolate (Mmt − and Dmt − , respectively). In the crystal structure (monoclinic, C 2/ c (no. 15), a = 2579.4(4), b = 1231.1(2), c = 1634.8(2) pm, β = 128.32(1)°, V = 4073.3(11)·10 6 ·pm 3 , Z = 8, R 1 [I 0 > 2σ(I 0 )]: 0.0355), half of the mercuric ions are essentially two‐coordinate (Hg–N: 210‐215 pm), the other half are tetrahedrally surrounded by N‐donor atoms (Hg–N: 221, 225 pm) of the Mmt − and Dmt − anions. These three‐N ligands construct a three‐dimensional framework.