Thermodynamics of coordination interactions of cobalt(II) and zinc(II) acetates with hexamethyltetrabutyl-substituted biladiene-a,c

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.