Two complexes based on 1H-1,2,3-triazole-4,5-dicarboxylic acid: hydrothermal synthesis, crystal structures and spectral properties

The crystal structure of diaqua-bis(pyrazolo[1,5-a]pyrimidine-3-carboxylato-κ2 N,O)-cobalt(II) dihydrate, C14H16N6O8Co

C14H16N6O8Co, monoclinic, P21/n (no. 14), a = 6.3520 (6) Å, b = 11.7438 (8) Å, c = 11.7880 (9) Å, β = 96.562 (9)°, V = 873.58 (12) Å3, Z = 2, R gt(F) = 0.0508, wR ref(F 2) = 0.0982, T = 290 K.

Crystal structure of ethyl 5-methyl-1-(pyridin-3-yl)-1H-1,2,3-triazole-4-carboxylate, C11H12N4O2

C11H12N4O2, monoclinic, P21/c (no. 14), a = 12.0258(15) Å, b = 8.0563(10) Å, c = 12.4478(13) Å, β = 104.157(4)°, V = 1169.4(2) Å3, Z = 4, Rgt(F) = 0.0619, wRref(F2) = 0.1616, T = 293(2) K.

Di-μ-aqua-bis-[aqua-(5-carboxyl-ato-1H-1,2,3-triazole-4-carb-oxy-lic acid-κ(2) N (3),O (4))lithium]

The crystal structure of the title compound, [Li₂(C₄H₂N₃O₄)₂(H₂O)₄], contains centrosymmetric dinuclear mol­ecules in which two Li^I ions are bridged by two water O atoms. The metal ion is coordinated by one N,O-bidentate ligand and three water O atoms (one of them is symmetry generated), with one of the bridging water O atoms in the apical position of a distorted square pyramid. The carboxyl­ate group that participates in coordination to the metal ion remains protonated; the other is deprotonated and coordination inactive. An intra­molecular O—H⋯O hydrogen bond between carboxyl­ate groups is observed. In the crystal, dimers are linked by O—H⋯O, O—H⋯N and N—H⋯O hydrogen bonds, generating a three-dimensional network.