Thermodynamics of coordination interactions of cobalt(II) and zinc(II) acetates with hexamethyltetrabutyl-substituted biladiene-<Emphasis Type="Italic">a,c</Emphasis>

The thermodynamics of the reaction of cobalt(II) and zinc(II) acetates with 1,3,7,13,17,19-hexamethyl-2,8,12,18-tetrabutylbiladiene-a,c (H₂L) in dimethylformamide (298.15 K) was studied by spectrophotometric and calorimetric titration. It was found that H₂L and Zn(II) form a mononuclear porphyrine-like complex ZnL, and in the case of Co(II), a binuclear biligand complex Co₂L₂ with a doubly interlaced structure is formed. Thermodynamic characteristics of the formation of Co(II) and Zn(II) complexes with biladiene-a,c in DMF at 298.15 K were determined. In the template synthesis of macrocyclic compounds from H₂L, it is more efficient to use Zn²⁺ than Co²⁺ ion as the template.