In general, if the atoms that make up the ring contain heteroatoms, such rings become heterocycles, and organic compounds containing heterocycles are called heterocyclic compounds. An article called Thermochemical study of some nickel(II) β-diketonates and their adducts with water and pyridine, published in 1984-05-31, which mentions a compound: 14481-08-4, Name is Bis(2,2,6,6-tetramethyl-3,5-heptanedionato)nickel(II), Molecular C22H38NiO4, HPLC of Formula: 14481-08-4.
Solution calorimetry was used to study the thermodn. of Ni(II) complexes with diketonates and their H2O or pyridine (Py) adducts. The heats of solution in HNO3 solutions and the standard heats of formation were determined for bis(1,1-trifluoropentane-2,4-dionato)Ni(II), Ni(TFA)2, and bis(2,2,6,6-tetramethylpentane-3,5-dionato)Ni(II), Ni(DPM)2, and also for [Ni(TFA)2]3, Ni(TFA)2.2H2O, Ni(TFA)2.2Py, Ni(DPM)2.2H2O, Ni(DPM)2.2Py, and Ni(NO3)2.6H2O. Bond energies, Ni-O and NiL2-D (L = ligand, D = adduct mol.) were also derived.
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Reference:
Ester – Wikipedia,
Ester – an overview | ScienceDirect Topics