From colorimetric chemosensors to metal nanoparticles using two new tyrosine Schiff-base ligands for Cu2+ detection

► New tyrosine Schiff-base ligands bearing an indole or a thianaphthene moiety. ► Colorimetric properties in the presence of Cu2+ metal ion. ► New metallic nanoparticles by self-reduction in an aqueous environment. ► Green synthetic methodologies.