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 Redistribution of ligands in [Rh(CO)A(PPh3)2][Pt(py)Cl3], published in 1990, which mentions a compound: 15227-42-6, Name is cis-Dichlorobis(pyridine)platinum(II), Molecular C10H10Cl2N2Pt, Synthetic Route of C10H10Cl2N2Pt.
[Rh(CO)A(PPh3)2][Pt(py)Cl3].DMF (I; A = py, 4-picoline (pic), 2,2′-bipyridine (bpy), 1,10-phenanthroline (phen)) were prepared by the reaction of [Rh(CO)A(PPh3)2]NO3 with K[Pt(py)Cl3] in DMF. For I (A = py, pic) at room temperature in DMF, Me2CO, CHCl3 or C6H6 after 15-30 min., redistribution of ligands occurred with the formation of Rh(CO)(PPh3)2Cl and cis-Pt(py)ACl2. I (A = bpy, phen) are stable in solution
If you want to learn more about this compound(cis-Dichlorobis(pyridine)platinum(II))Synthetic Route of C10H10Cl2N2Pt, you may wish to communicate with the author of the article,or consult the relevant literature related to this compound(15227-42-6).
Reference:
Tetrahydroisoquinoline – Wikipedia,
1,2,3,4-Tetrahydroisoquinoline | C9H11N – PubChem