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 Solid-State Coordination Chemistry of Copper(II) Tetrazolates: Anion Control of Frameworks Constructed from Trinuclear Copper(II) Building Blocks, published in 2009-06-01, which mentions a compound: 14389-12-9, Name is 5-(4-Pyridyl)-1H-tetrazole, Molecular C6H5N5, Electric Literature of C6H5N5.
The products of the reactions of Cu(II) starting materials with 4-pyridyltetrazole (4-Hpt) in DMF/MeOH solutions are determined by the anion identity and concentration In the absence of chloride, the 3-dimensional open-framework material [Cu3(OH)3(4-pt)3(DMF)4]·5DMF·3MeOH (1·5DMF·3MeOH) is isolated, while variations in the chloride concentration yield the 2-dimensional and 3-dimensional materials, [Cu3Cl4(4-pt)2(4Hpt)2]·4DMF·2MeOH (2) and [Cu3Cl2(4-pt)4]·4DMF·4MeOH (3), resp. All three structures exhibit trinuclear Cu(II) building blocks: the triangular {Cu3(μ3-OH)}5+ core in 1 and {Cu3Cl4(4-pt)4(4-Hpt)2}2- and {Cu3Cl2(4-pt)8}4- chains in 2 and 3, resp. All three materials display microporosity, which is highly dependent on the method of sample preparation
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Reference:
Chiral nitrogen ligands in late transition metal-catalysed asymmetric synthesis—I. Addressing the problem of ligand lability in rhodium-catalysed hydrosilations,
Nitrogen-Containing Ligands for Asymmetric Homogeneous and Heterogeneous Catalysis