Halogen Bonding Synthon Modularity in Coordination Compounds

In this Communication, the modulation of halogen bonding synthons in the crystal structure of [HgBr2(L3,4‑diCl)] from [HgBr2(L3‑Cl)] and [HgBr2(L4‑Cl)], as single components, where L is a N-(chlorinatedphenyl)-2-pyrazinecarboxamide ligand, has been investigated. Reviewing the crystal packing reveals that Cl···N and Cl···Br halogen bonds stood as a remembrance of the crystal structures of single components in the packing of [HgBr2(L3,4‑diCl)].