Supramolecular self-assembling of [HgII(RC6H4NNNC6H4R)2Py] [R = EtOC(O)] through reciprocal metal-η2-arene π-interactions and non classical C-H···O bonding: synthesis and X-ray characterization of a bis diaryl symmetric-substituted triazenide complex polymer of Hg(II)

Deprotonated 1,3-bis(4-ethoxycarbonylphenyl)triazene reacts with Hg(CH3COO)2 in tetrahydrofurane to give light-yellow crystals of {[HgII(RC6H4NNNC6H4R)2Py]2}n [R = EtOC(O)]. The [HgII(RC6H4NNNC6H4R)2Py] tectons are linked to pairs as centrosymmetric dimers through reciprocal metal-η2-arene π-interactions. The dimeric units - related to each other by a n-glide plane - are linked into chains along to the crystallographic direction [101] through non classical C-H···(O)COEt (hydrogen) bonds involving the ortho C-H group of the pyridine ligand. These chains are related by translation in the unit cell along the direction [100] through another kind of non classical hydrogen bonding, this one involving hydrogen and oxygen atoms of adjacent ethoxycarbonylphenyl groups of the same plane, resulting an extended supramolecular bidimensional (2D) assembling parallel to the crystallographic plane (011).

triazenes; triazenide-complexes; supramolecular assembling of Hg complex-tectons; Hg-η2-arene π-interactions