Crystal structure and Hirshfeld surface analysis of cyclo-tetra-bromido-1κ(2)Br,3κ(2)Br-tetra-kis-(μ(2)-2-{[(pyridin-2-yl)meth-yl]amino}-ethane-1-thiol-ato-κ(3)N,S:S)tetra-mercury(II).

The macrometallacyclic title compound, [Hg(4)Br(4)(C(8)H(11)N(2)S)(4)] or [((HgL (2))(HgBr(2)))(2)] (1) where HL = 2-{[(pyridin-2-yl)meth-yl]amino}-ethane-1-thiol, was prepared and structurally characterized. The Hg(2+) complex crystallizes in the P2(1)/c space group. The centrosymmetric Hg(4)S(4) metallacycle is constructed from metal ions with alternating distorted tetra-hedral Br(2)S(2) and distorted seesaw N(2)S(2) primary coordination environments with pendant pyridyl groups. The backfolded extended chair metallacycle conformation suggests inter-actions between each of the bis-chelated mercury atoms and Br atoms lying above and below the central Hg(2)S(4) plane. Supra-molecular inter-actions in 1 include a fourfold aryl embrace and potential hydrogen bonds with bromine as the acceptor. Hirshfeld surface analysis indicates that H⋯H (51.7%), Br⋯H/H⋯Br (23.0%) and C⋯H/H⋯C (9.5%) inter-actions are dominant.