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A series of racemic, heteronuclear complexes [Zn₂Nd(ac)₂(HL)₂]NO₃·3H₂O ( 1 ), [Zn₂Sm(ac)₂(HL)₂]NO₃·3CH₃OH·0.3H₂O ( 2 ), [Zn₂Ln(ac)₂(HL)₂]NO₃·5.33H₂O ( 3 ⁻ 5 ) (where HL is the dideprotonated form of N , N '-bis(5-bromo-3-methoxysalicylidene)-1,3-diamino-2-propanol, ac = acetate ion, and Ln = Eu ( 3 ), Tb ( 4 ), Dy ( 5 ), respectively) with an achiral multisite coordination Schiff base ligand ( H₃L ) were synthesized and characterized. The X-ray crystallography revealed that the chirality in complexes is centered at lanthanide(III) ions due to two vicinally located μ -acetato-bridging ligands. The presented crystals have isoskeletal coordination units but they crystallize in monoclinic ( 1 , 2 ) or trigonal crystal systems ( 3 ⁻ 5 ) with slightly different conformation. In 1 and 2 the Zn II ⁻Ln III ⁻Zn II coordination core is linear, whereas in isostructural crystals 3 ⁻ 5 the chiral coordination cores are bent and lie on a two-fold axis. The complexes 1 , 3 ⁻ 5 show a blue emission attributed to the emission of the ligand. For Zn II ₂Sm III complex ( 2 ) the characteristic emission bands of f-f* transitions were observed. The magnetic properties for compounds 1 , 4 and 5 are characteristic for the paramagnetism of the corresponding lanthanide(III) ions.

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Heterometallic ZnII–LnIII–ZnII Schiff Base Complexes with Linear or Bent Conformation—Synthesis, Crystal Structures, Luminescent and Magnetic Characterization