“…The affinity of amide moieties for binding of metal ions strongly depends on deprotonation ability of amidic nitrogen, which is the coordination center for chelating metal ions. It is well known that amide, as H-donor, is able to chelate Cu(II) [22], Ni(II) [23], Zn(II) [24], Sn [18], Co(II) [25], Pd(II) [26]. Mohamadou et al [27] also presented that the chelation of metal ions by the amidic nitrogen enhanced amide hydrogen ionization.…”