Multinuclear Luminescent Schiff-Base Zn−Nd Sandwich Complexes

Multinuclear 3d−4f complexes with sandwichlike molecular structures are formed with the Schiff-base ligand bis(3-methoxysalicylidene)ethylene-1,2-phenylenediamine(H2L). The stoichiometry and structures are dependent on the Zn:Nd ratio and counteranions present. They are trinuclear [Nd(ZnL)2(NO3)2(H2O)2]·NO3·EtOH·H2O (1), [Nd(ZnL)2Cl2(H2O)3]·Cl·2MeOH·5H2O (2), and tetranuclear [Nd2(ZnL)2Cl6(MeOH)2]·MeOH (3). Dinuclear complex [NdZnL(NO3)3MeCN]·MeCN (4) was also characterized. Near-infrared (NIR) lanthanide luminescence is observed in these complexes.