Synthesis of copper(II) complexes of new carbon-scorpionate ligands

A set of new “carbon-based” scorpionate ligands based on S- and N-containing heterocyclic moieties have been synthesized. They offer the advantage of a higher stability with respect to the “classical” boron-based scorpionate ligands and also a certain degree of hydrophilicity. The synthesis of these ligands was accomplished by the coupling reaction of the N-methylimidazolyllithium with a suitable electrophilic partner. The reaction yield ranges from 40% to 65%. Preliminary results on the synthesis and characterization of the related copper(II) complex are also presented.