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 Infrared and Raman spectra of 1,5-cyclooctadiene complexes of copper(I), silver(I), gold(I), and gold(III) and the nature of the gold compounds, published in 1973, which mentions a compound: 32717-95-6, Name is Chloro(1,5-cyclooctadiene)copper(I) dimer, Molecular C16H16Cl2Cu2, Recommanded Product: 32717-95-6.
There have been several recent reports on the spectra of C2H4 and 1,5-cyclooctadiene complexes of d8 metallic ions which have shown that 2 bands in the vibrational spectrum of the olefin are sensitive to the coordinated metal. A series of d10 ions were complexed to 1,5-cyclooctadiene and a shift was found having the order Au(I) ∼ Cu(I) > Ag(I). Three distinct compounds were also formed between 1,5-cyclooctadiene and Au(III) or Au(I) and their ir spectra and suggested structures are reported.
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Reference:
Quinoxaline – Wikipedia,
Quinoxaline | C8H6N2 | ChemSpider