In organic chemistry, atoms other than carbon and hydrogen are generally referred to as heteroatoms. The most common heteroatoms are nitrogen, oxygen and sulfur. Now I present to you an article called The First trans-Configured Cyclopalladated Amine, published in 2005-10-24, which mentions a compound: 33216-52-3, mainly applied to trans configured cyclopalladated amine preparation crystal mol structure; aminoethylphenyl trichloropyridine palladium orthopalladated preparation crystal mol structure, Application In Synthesis of 3,4,5-Trichloropyridine.
More than 100 ortho-palladated neutral arylamines with two addnl. monodentate ligands, namely, a N- or P-bonded Lewis base L and a mononeg. ligand X, correspond to the cis configuration with respect to their Pd-C and Pd-L bonds. In contrast, (S)-[2-(1-aminoethyl)phenyl-κ2C1,N]chloro(3,4,5-trichloropyridine-κN)palladium(II) represents the first structurally characterized trans-configured complex of this class.
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Reference:
Bromide – Wikipedia,
bromide – Wiktionary