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Abstract
The reaction of Mn(O2CMe)(2)center dot 2H(2)O with Me-saoH(2) (Me-saoH(2) = 2-hydroxyphenylethanone oxime) in MeCN forms the complex [Mn-4(III)(Me-sao)(4)(Me-saoH)(4)] (1) in good yields. Replacing Me-saoH(2) with Naphth-saoH(2) (Naphth-saoH(2) = 2-hydroxy-1-napthaldoxime) in the presence of CH3ONa forms the complex [Mn-4(III)(Naphth-sao)(4)(Naphth-saoH)(4)] (2) in low yields, while the reaction between Mn(ClO4)(2)center dot 6H(2)O, Et-saoH(2) (Et-saoH(2) = 2-hydroxypropiophenone oxime) and NBu4OH in MeCN gives the complex [Mn-4(III)(Et-sao)(4)(Et-saoH)(4)] (3) in moderate yields. All three tetrametallic cages exclusively contain Mn-III centres arranged in a "cube"-like topology, in which the metal centres are connected by-N-O-oximate 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.
Original language | English |
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Pages (from-to) | 4777-4785 |
Number of pages | 9 |
Journal | Dalton Transactions |
Volume | 39 |
Issue number | 20 |
DOIs | |
Publication status | Published - 2010 |
Keywords / Materials (for Non-textual outputs)
- PHOTOSYNTHETIC WATER OXIDATION
- NEUTRON-SCATTERING SPECTRA
- OXYGEN-EVOLVING COMPLEX
- PHOTOSYSTEM-II
- CRYSTAL-STRUCTURES
- ELECTRON-TRANSFER
- ENERGY-LEVELS
- TETRANUCLEAR
- TRINUCLEAR
- CLUSTER
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