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 Bis(pentafluorophenyl) complexes of palladium(II) and of platinum(II), published in 1974, which mentions a compound: 15227-42-6, Name is cis-Dichlorobis(pyridine)platinum(II), Molecular C10H10Cl2N2Pt, Synthetic Route of C10H10Cl2N2Pt.
The preparation of 8 bis(pentafluorophenyl) complexes of Pd(II) and of Pt(II) with monodentate and bidentate N-donor ligands is described together with a preparation of a Pd(II) complex of 1,2-bis(diphenylphosphino)ethane. Assignments of cis or trans configuration are discussed which depend upon the splitting or disappearance of certain bands in ir.
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Reference:
Tetrahydroisoquinoline – Wikipedia,
1,2,3,4-Tetrahydroisoquinoline | C9H11N – PubChem