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 [((Hg L 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 P 2 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.