Nickel/Lanthanide Single-Molecule Magnets: {Ni₃Ln} “Stars” with a Ligand Derived from the Metal-Promoted Reduction of Di-2-pyridyl Ketone under Solvothermal Conditions

Abstract

Unusual {Ni(II)(3)Ln(III)(μ-OR)(6)}(3+) complexes with a "star" topology have been prepared with ligands derived from the metal-promoted reduction of di-2-pyridyl ketone under solvothermal conditions; the Dy(III) member shows weak single-molecule-magnet behavior.

Crystal structure and magnetic properties of di-copper and di-zinc complexes with di-2-pyridyl ketone oxime

“…Specifically, we started with previously reported chloro derivatives-[Cu 2 (dpko) 2 Cl 4 ]Cl 2 and Zn(dpko)Cl 2 -of transition-metaldpko complexes and synthesized and structurally characterized the corresponding bromo derivatives. In addition, we report the EPR spectroscopic properties of [Cu 2 (dpko) 2 4 ] crystallizes in the space group C2/c, and the cation is structurally similar (Fig. 2) to the previously reported [Cu 2 (dpko) 2 Cl 4 ]Cl 2 [5]; however, the anion is a tetrabromocopper(II)ate instead of a bromide.…”

“…A variety of silver complexes exist that show the efficacy of dpk in forming metal-containing polymers; [1] however, the silver ion in these cases is in the +1 oxidation state, which means the complexes possess full, closed shells of electrons that will not allow conductive or magnetic flow. Replacement of silver in the synthetic pathway with a conductive metal center (e.g., Cr, Fe, Cu) does not lead to metal-containing polymers, though some di-metal bridged centers have been observed [2,3]. Derivatives of dpk are proving a richer area for study; one such derivative is di-2-pyridyl ketone oxime (dpko) (Fig.…”

“…The powder EPR spectra showed broad features centered at approximate g-values of 2.119 for [Cu 2 (dpko) 2 (Fig. 3a).…”

Molecular Nanomagnets and Related Phenomena

“…Although this still represents only one particular case, at the moment, we are quite confident that the relevance of multiple-spin systems with weak intramolecular spin-spin coupling will grow in the future, as these systems offer very 364 L. Bogani . This is identified as the electrical fingerprint of the pseudo-triplet state.…”

A Novel Family of Triangular CoII2LnIII and CoII2YIII Clusters by the Employment of Di-2-Pyridyl Ketone

“…The study of mixed-metal 3d/4f reaction systems, as a means for the isolation of new SMMs with a high energy barrier for the magnetization reversal, has led to a large variety of such species that now include Mn/4f [16][17][18][19][20][21], Fe/4f [22][23][24][25], Ni/4f [8,26], Cu/4f [27][28][29][30] and Co/4f [8,[31][32][33] compounds [1,2]. It is noteworthy that the majority of 3d/4f SMMs are Mn/4f clusters containing some Mn III centers with an S = 2 spin state and a significant uniaxial anisotropy.…”