Two disc-like heptanuclear clusters based on Schiff base: syntheses, structure and magnetic properties

Abstract

Two new disc-like heptanuclear complexes [Ni₇(mmimp)₆(MeO)₆]·2(ClO₄) (1), [Ni₇(mmimp)₆(MeO)₆]·2(NO₃) (2) were synthesised, where Hmmimp is 2-methoxy-6-methyliminomethyl-phenol. The two compounds were characterised by elemental analysis, IR and X-ray single-crystal diffraction. Compounds 1 and 2 are heptanuclear clusters with the similar cubane topology in which the metal ions and the oxygen, nitrogen atoms from the mmimp⁻  ligands possess a planar hexagonal disc-like structure. Magnetic properties of 1 and 2 have been discussed. The {Ni₇} (1) and {Ni₇} (2) cores display dominant ferromagnetic interactions from the nature of the binding modes through μ₃-OCH₃⁻ .

Abstract

Contrast to microwave assist synthesis, the quality and yield of product are obviously better than using solvothermal methods, with shortened reaction time. Two disc-like heptanuclear clusters described were obtained by changing the nickel (II) salts. The {Ni7} cores display dominant ferromagnetic interactions from the nature of the binding modes through μ₃-OCH₃⁻ .

Keywords::

• heptanuclear clusters
• microwave assisted methods
• crystal structure
• magnetic properties

Acknowledgements

This work was financially supported by the National Nature Science Foundation of China (No. 21161006), Program for Excellent Talents in Guangxi Higher Education Institutions (Gui Jiao Ren [2012]41).