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 Mass spectrometry of platinum(II) complexes. Comparison of cis and trans isomers. Fragmentation and rearrangement pathways, published in 1971, which mentions a compound: 15227-42-6, Name is cis-Dichlorobis(pyridine)platinum(II), Molecular C10H10Cl2N2Pt, Safety of cis-Dichlorobis(pyridine)platinum(II).
The mass spectra of 8 pairs of cis and trans isomers of PtL2X2 (L=NH3, pyridine PEt3, or PPh3; X=Cl, Br, or I) are presented and discussed. Two chelates, Pt(bipy)Cl2 and Pt(dpm)Cl2(dpm=di-α-pyridylmethane), are also included. The most significant results are: (1) parent ions can be observed for almost all these relatively involatile coordination compounds; (2) most ligand fragmentations and rearrangements occur with ligand-metal bonds intact; (3) some rearrangements appear to involve the metal; (4) cis and trans isomers of phosphine complexes give different fragmentation patterns; (5) spectra of chelates differ considerably from the spectra of analogous nonchelates; (6) in Pt(NH3)2Cl2 and Pt(py)2Cl2, little or no difference is observed in the spectra of cis and trans isomers after electron impact. Therefore, excitation to a tetrahedral state may take place.
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Reference:
Tetrahydroisoquinoline – Wikipedia,
1,2,3,4-Tetrahydroisoquinoline | C9H11N – PubChem