The reaction of Mn(O2CMe)2·2H2O with Me-saoH2 (Me-saoH2= 2-hydroxyphenylethanone oxime) in MeCN forms the complex [MnIII4(Me-sao) 4(Me-saoH)4] (1) in good yields. Replacing Me-saoH 2 with Naphth-saoH2 (Naphth-saoH2 = 2-hydroxy-1-napthaldoxime) in the presence of CH3ONa forms the complex [MnIII4(Naphth-sao)4(Naphth-saoH) 4] (2) in low yields, while the reaction between Mn(ClO 4)2·6H2O, Et-saoH2 (Et-saoH2= 2-hydroxypropiophenone oxime) and NBu4OH in MeCN gives the complex [MnIII4(Et-sao)4(Et- saoH)4] (3) in moderate yields. All three tetrametallic cages exclusively contain MnIII centres arranged in a "cube"-like topology, in which the metal centres are connected by-N-Ooximate groups. The magnetic properties of 1-3 are near identical, revealing the presence of only ferromagnetic interactions between the metal ions leading to high-spin ground states of S = 8. The complexes display frequency dependent out-of-phase signals in ac susceptibility studies and, in the case of 1 single-molecule magnetism has been observed by means of single-crystal hysteresis loop measurements.
ASJC Scopus subject areas
- Inorganic Chemistry