Synthesis, Structure, Luminescent, and Magnetic Properties of Carbonato-Bridged ZnII2LnIII2 Complexes [(μ4-CO3)2{ZnIILnLnIII(NO3)}2] (LnIII = GdIII, TbIII, DyIII; L1 = N,N′-Bis(3-methoxy-2-oxybenzylidene)-1,3-propanediaminato, L2 = N,N′-Bis(3-ethoxy-2-oxybenzylidene)-1,3-propanediaminato)

Carbonato-bridged ZnII2LnIII2 complexes [(μ4-CO3)2{ZnIILnLnIII(NO3)}2]·solvent were synthesized through atmospheric CO2 fixation reaction of [ZnIILn(H2O)2]·xH2O, LnIII(NO3)3·6H2O, and triethylamine, where LnIII = GdIII, TbIII, DyIII; L1 = N,N′-bis(3-methoxy-2-oxybenzylidene)-1,3-propanediaminato, L2 = N,N′-bis(3-ethoxy-2-oxybenzylidene)-1,3-propanediaminato. Each ZnII2LnIII2 structure possessing an inversion center can be described as two di-μ-phenoxo-bridged {ZnIILnLnIII(NO3)} binuclear units bridged by two carbonato CO32– ions. The ZnII ion has square pyramidal coordination geometry with N2O2 donor atoms of Ln and one oxygen atom of a bridging carbonato ion at the axial site. LnIII ion is coordinated by nine oxygen atoms consisting of four from the deprotonated Schiff-base Ln, two from a chelating nitrate, and three from two carbonate groups. The temperature-dependent magnetic susceptibilities in the range 1.9–300 K, field-dependent magnetization from 0 to 5 T at 1.9 K, and alternating current magnetic ...