Three new coordination compounds with complex cations [M(X) 6]n+ (M = Co: X = H2O, NH3 and n = 3; M = Ni: X = H2Oand n = 2) and Hydrogenacetylenedicarboxylate anions [Drei neue koordinationsverbindungen mit komplexen metallkationen [M(X) 6] n+ (M = Co: X = H2O, NH3 und n = 3; M = Ni: X = H2O und n = 2) und Hydrogenacetylendicarboxylat als Anion]

摘要

From an aqueous solution containing acetylenedicarboxylic acid (H2ADC) and [Co(NH3)6]Cl3 or Ni(O2CCH 3)2 · 4H2O single crystals of [Co(H 2O)6][(ADC)(HADC)]-2H2O(1), [Co(NH 3)6]- [Cl2(HADC)] · H2O(2)and [Ni(H2O)6](HADC)2 · 2H2O(3) precipitated upon slow evaporation of the solvent. In their crystal structures slightly distorted octahedral coordination spheres of the metal ions ([Co(H 2O)6]3+,[Co(NH3)6] 3+ and [Ni(H2O)6]2+) are found. These complex cations are further connected via weak hydrogen bonds to structural units of higher dimensionality. All compounds contain mono-protonated acetylenedicarboxylate anions (HADC-). In 1 strong hydrogen bonds (O O = 2.524(5) ?) form ADC- HADC- dimers, whereas in 2 (H 2O- HADC-)∞; ribbons (O - O = 2.496(4) ? and 2.676(3) ?, respectively) and in 3 (HADC-) ∞ chains (O- O = 2.489(3) ?) are found. 1 and 2 represent new structure types, whereas 3 is isotypic to the known Mg and Zn compounds.