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 Study on porphyrin complex ligated with azaferrocene derivatives, published in 2002, which mentions a compound: 616-43-3, Name is 3-Methyl-1H-pyrrole, Molecular C5H7N, Safety of 3-Methyl-1H-pyrrole.
[5,10,15,20-Tetrakis(pentafluorophenyl)porphyrinato]iron complex ligated with azaferrocene has two crystal forms, while the corresponding complex ligated with 3-methylazaferrocene has only one crystal form. An introduction of Me substituent to the pyrrole ring makes a less stable complex.
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Reference:
Synthesis and Crystal Structure of a Chiral C3-Symmetric Oxygen Tripodal Ligand and Its Applications to Asymmetric Catalysis,
Chiral lanthanide(III) complexes of sulphur–nitrogen–oxygen ligand derived from aminothiourea and sodium D-camphor-β-sulfonate