Toward a ligand specific of Pb2+ with respect to the Zn2+ and Ca2+ cations: A track from quantum chemistry

From computational chemistry simulations, a ligand has emerged that could be selective of Pb2+ toward Zn2+ and Ca2+, an important point when designing new chelators usable in vivo as remediation agents against lead poisoning (saturnism). Some electronic properties of 1,4,7,10,13,16-hexaoxa-cyclooctadeca-2,5,8,11,14,17-hexaene (hoc-18) are examined here in details, together with those of some thio-analogs. Several interpretative ab initio methodologies that allow clarifying a number of characteristics of hoc-18 towards Zn2+, Ca2+ and Pb2+ are considered from the viewpoint of coordination chemistry.