Supramolecular aggregation patterns in mononuclear organomercury carboxylates

Abstract

The crystal and molecular structures of three organomercury carboxylate derivatives are described, viz. PhHg[O₂CC₆H₄{N=N(C₆H₃—4-OH—5-CHO)}-o] (1), (p-xylol)Hg[O₂CC₆H₄{N=N(C₆H₃—4-OH—5-CHO)}-o] (2), characterised as a hemi-toluene solvate, and (p-xylol)Hg[O₂CC₆H₄NH₂-o] (3). In each case, the crystallographic data indicate that the Hg atom is linearly coordinated by an aryl-C and a carboxylate-O atom. In 1, supramolecular aggregation occurs via Hg…O and Hg…N interactions and lead to the formation of a supramolecular chain along the a-axis. The Hg…O interactions persist in the crystal structure of the p-xylol derivative 2 and the resulting supramolecular chains are connected into a two-dimensional array in the ab-plane via O–H…O hydrogen bonding. Similarly, in the crystal structure of 3, Hg…O and N–H…O hydrogen bonding combine to lead to the formation of supramolecular arrays in the ac-plane. Crystal data for (1): triclinic, P-1, a = 6.1386(7), b = 10.9066(12), c = 26.808(3) Å, α = 82.655(2), β = 86.736(2), γ = 82.484(2)°, V = 1763.3(3) ų, Z = 4, R = 0.042. Crystal data for (2): triclinic, P-1, a = 7.2322(11), b = 11.080(2), c = 15.372(3) Å, α = 95.230(19), β = 98.545(16), γ = 107.972(17)°, V = 1146.3(4) ų, Z = 1, R = 0.029. Crystal data for (3): monoclinic, P2₁/c, a = 7.0450(8), b = 29.109(3), c = 7.2476(8) Å, β = 117.520(2)°, V = 1318.1(3) ų, Z = 4, R = 0.034.