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 Weakly Coordinated Zinc and Aluminum σ-Complexes of Copper(I), published in 2014-06-09, which mentions a compound: 75732-01-3, Name is Mesitylcopper(I), Molecular C9H11Cu, Recommanded Product: 75732-01-3.
Authors report the synthesis and isolation of three new σ-complexes of Cu(I) in which E-H (E = Al, Zn) σ-bonds are coordinated to copper. The addition of the main group hydride to a toluene-solvated Cu(I) complex results in reversible ligand exchange, and the Cu(I) σ-complexes have been crystallized Exptl. and computational data provide a wealth of evidence for weak binding of the E-H bond to Cu(I), which can be ascribed to σ-donation from the E-H bond into the 4s orbital of copper and back-donation from copper into the E-H σ* orbital.
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Reference:
Iodide – Wikipedia,
Iodide – an overview | ScienceDirect Topics – ScienceDirect.com