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 Insulin-like model complexes: Synthesis, spectra characterization and crystal structure of two novel oxovanadium complexes with poly(pyrazolyl)borate ligands VO(HB(pz)3)(H2B(pz)2) and VO(B(pz)4)2, published in 2007-08-06, which mentions a compound: 18583-60-3, Name is Potassiumtris(1-pyrazolyl)borohydride, Molecular C9H10BKN6, Category: piperazines.
Two new oxovanadium(IV) complexes, VO(HB(pz)3)(H2B(pz)2) (1) and VO(B(pz)4)2 (2), were obtained by the reaction of oxovanadium sulfate with the corresponding poly(pyrazolyl)borate ligands KHB(pz)3, KH2B(pz)2 and KB(pz)4, resp. The two complexes were characterized by elemental analyses, IR, UV-visible and x-ray diffraction. Complex 1 crystallizes in the orthorhombic space group, Pca21. Complex 2 crystallizes in the orthorhombic space group, Pna21. In both complexes, five nitrogen atoms and one oxygen atom coordinate to the vanadium atom, forming a distorted octahedral geometry (VON5). Related spectra characterization, hydrogen-binding properties, structural configuration and quantum chem. calculations are also discussed.
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Reference:
Piperazine – Wikipedia,
Piperazines – an overview | ScienceDirect Topics