Structural Characterization of Heterodinuclear ZnII-LnIII Complexes (Ln = Pr, Nd) with a Ring-Contracted H2 valdien-Derived Schiff Base Ligand

Synthesis and structural characterization of two heterodinuclear Zn-II-Ln(III) complexes with the formula [ZnLn(HL)(mu-OAc)(NO3)(2)(H2O)(x)(MeOH)(1-x)]NO3 center dot n H2O center dot n MeOH [Ln = Pr (1), Nd (2)] and the crystal and molecular structure of [ZnNd(HL)(mu-OAc)(NO3)(2)(H2O)] [ZnNd(HL)(OAc)(NO3)(2)(H2O)](NO3)(2) center dot n H2O center dot n MeOH (3) are reported. The asymmetrical compartmental ligand (E)-2-(1-(2-((2-hydroxy-3-methoxybenzylidene)amino)-ethypimidazolidin-2-yl)-6-methoxyphenol (H2L) is formed from N-1, N-3-bis(3-methoxysalicylidene)diethylenetriamine (H-2 valdien) through intramolecular aminal formation, resulting in a peripheral imidazoline ring. The structures of 1-3 were revealed by X-ray crystallography. The smaller Zn-II ion occupies the inner N2O2 compartment of the ligand, whereas the larger and more oxophilic Ln(III) ions are found in the outer O2O2 site. [GRAPHICS] .

Automated summary

The synthesis and structural characterization of two heterodinuclear Zn-II-Ln(III) complexes were reported, where the smaller Zn-II ion occupies the inner N2O2 compartment of the ligand while the larger and more oxophilic Ln(III) ions are found in the outer O2O2 site. The structures were revealed by X-ray crystallography, showing the formation of an asymmetrical compartmental ligand formed from N-1, N-3-bis(3-methoxysalicylidene)diethylenetriamine.