The discovery of the remarkable antiviral and a potential therapeutic properties against HIV and/or Ebola virus of hexamminecobalt(III) chloride [Co(NH3)6]Cl3 [1, 2] stimulate the search and the development of promising multicomponent antiviral and antibacterial compounds. The multicomponent pharmaceutical solids involving hexamminecobalt(III) cations together with another bio-active molecules may be used for obtaining new promising substances and finetuning of physicochemical properties such as solubility, physical stability, and powder compaction. The crystallization under ambient conditions of hexamminecobalt(III) chloride and 1H-imidazole-1-acetic acid (HL) in water/methanol medium in the presence of triethanolamine (H3tea) results in crystalline multicomponent ionic complex [CoIII(NH3)6]3[CoIIL6]2•H2tea•10H2O. The compound crystalizes in monoclinic space group P21/n, a = 25.050(1), b = 14.450(1), c = 33.873(2) Å, b = 104.305(5)°, V = 11881(1) Å3 and comprises [CoIII(NH3)6]3+ cations, H2tea^– anions, partially disordered solvent water molecules and, surprisingly, the six-coordinated anionic complexes [CoIIL6]4^– (Figure). Here, 1H-imidazole-1-acetate ligands are monodentate and coordinate to cobalt(II) atoms via nitrogen atom to complete their octahedral surrounding. The Co(II)–N distances in the range 2.138(11) 2.194(11) Å undoubtedly indicate +2 oxidation state for Co and are essentially longer comparing to the Co(III)–N distances of 1.925(9) - 1.991(9) Å in the hexamminecobalt(III) cations. The conformation of twelve symmetry independent organic ligands in two symmetry independent complex anions is rather similar and dihedral angle between the planes of imidazole and carboxylic group fragments varies in the interval 64.67 - 71.68º. The survey of Cambridge structural database (CSD) revealed that the reported compound represents the first example of monocoordinated imidazole-1acetate ligand, which usually serves as a m2- or m3-bridges in coordination compounds. In the crystal structure the deprotonated carboxylic groups are involved in multiple charge-assisted N–H···O hydrogen bonds between the complex cations and anions as well as with solvent water molecules.