Thermochemistry of adducts of bis(2,4-pentanedionato)zinc with heterocyclic amines

The adducts Zn(AcAc)(2). nL [where L = piperazine (pipz), morpholine (morph), piperidine (pipd), pyridine (py), 3-methylpyridine (beta-pico), 4-methylpyridine (gamma-pico), 3-cyanopyridine (3-cyanopy), 4-cyanopyridine (4-cyanopy), 2,2'-bipyridine (bipy), or quinoline (quin); n = 1 or 3/2; AcAc = acetylacetonate] were synthesized and characterized by melting points, elemental analysis, thermal studies, and infrared spectroscopy. From calorimetric studies in solution, the mean standard enthalpies of the zinc-nitrogen bonds were determined.