Synthesis, Crystal Structures and Magnetic Properties of Trinuclear {Ni2Ln} (LnIII = Dy, Ho) and {Ni2Y} Complexes with Schiff Base Ligands

Crystals

Angeliki Panagiotopoulou¹  Vassilis Psycharis²  Despina Dermitzaki²  Yiannis Sanakis²  Michael Pissas²  Catherine P. Raptopoulou² 

[1] Institute of Biosciences and Applications, NCSR “Demokritos”, Aghia Paraskevi, 15310 Athens, Greece;Institute of Nanoscience and Nanotechnology, NCSR “Demokritos”, Aghia Paraskevi, 15310 Athens, Greece;

关键词: heterotrinuclear complexes;    nickel;    lanthanides;    Schiff base;    magnetic properties;    crystal structure;   

DOI  :  10.3390/cryst12010095

来源: DOAJ

【 摘 要 】

The reaction of the Schiff base ligand o-OH-C₆H₄-CH=N-C(CH₂OH)₃, H₄L, with Ni(O₂CMe)₂∙4H₂O and lanthanide nitrate salts in a 4:2:1 ratio lead to the formation of the trinuclear complexes [Ni₂Ln(H₃L)₄(O₂CMe)₂](NO₃) (Ln = Dy (1), Ho (2), and Y (3)) which crystallize in the non-centrosymmetric space group Pna2₁. The complex cation consists of the three metal ions in an almost linear arrangement. The {Ni₂Ln} moieties are bridged through two deprotonated O_phenolato groups from two different ligands. Each terminal Ni^II ion is bound to two ligands through their O_phenolato, the N_imino atoms and one of the protonated O_alkoxo groups in a distorted octahedral. The central lanthanide ion is coordinated to four O_phenolato oxygen from the four ligands, and four O_carboxylato 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 1–3 were studied and showed that 1 exhibits field induced slow magnetic relaxation.

【 授权许可】

Unknown