| Summary: | The reaction of the Schiff base ligand o-OH-C<sub>6</sub>H<sub>4</sub>-CH=N-C(CH<sub>2</sub>OH)<sub>3</sub>, H<sub>4</sub>L, with Ni(O<sub>2</sub>CMe)<sub>2</sub>∙4H<sub>2</sub>O and lanthanide nitrate salts in a 4:2:1 ratio lead to the formation of the trinuclear complexes [Ni<sub>2</sub>Ln(H<sub>3</sub>L)<sub>4</sub>(O<sub>2</sub>CMe)<sub>2</sub>](NO<sub>3</sub>) (Ln = Dy (<b>1</b>), Ho (<b>2</b>), and Y (<b>3</b>)) which crystallize in the non-centrosymmetric space group <i>P</i>na2<sub>1</sub>. The complex cation consists of the three metal ions in an almost linear arrangement. The {Ni<sub>2</sub>Ln} moieties are bridged through two deprotonated O<sub>phenolato</sub> groups from two different ligands. Each terminal Ni<sup>II</sup> ion is bound to two ligands through their O<sub>phenolato</sub>, the N<sub>imino</sub> atoms and one of the protonated O<sub>alkoxo</sub> groups in a distorted octahedral. The central lanthanide ion is coordinated to four O<sub>phenolato</sub> oxygen from the four ligands, and four O<sub>carboxylato</sub> atoms from two acetates which are bound in the bidentate chelate mode, and the coordination polyhedron is biaugmented trigonal prism, which probably results in a non-centrosymmetric arrangement of the complexes in the lattice. The magnetic properties of <b>1</b>–<b>3</b> were studied and showed that <b>1</b> exhibits field induced slow magnetic relaxation.
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