Abstract
A series of pentadentate ligands N–X–5LH2 (X = H, Methyl, Benzyl) = N–X–saldptn (4-X-N,N′-bis(1-hydroxy-2-benzylidene)-1,7-diamino-4-azaheptane) has been prepared by a Schiff base condensation between 1,7-diamino-4-X-azaheptane and salicylaldehyde. Complexation with Fe(III) yields a series of high-spin (S = 5/2) complexes of [FeIII(N–X–5L)Cl]. Such precursors were combined with [Mo(CN)8]4− and a series of blue nonanuclear cluster compounds [MoIV{(CN)FeIII(N–X–5L)}8]Cl4 resulted. Such star-shaped nonanuclear compounds are high-spin systems at room temperature. On cooling to 10 K some of the iron(III) centers switched to the low-spin state as proven by Mössbauer spectra, i.e. multiple electronic transitions. Parts of the compounds perform a high-spin to high-spin transition. Under light irradiation the populations are altered slightly.
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Renz, F., Hill, D., Kerep, P. et al. Effect of N-substitution in multinuclear complexes allows interplay between magnetic states and multistability investigated by Mössbauer spectroscopy. Hyperfine Interact 168, 1051–1056 (2006). https://doi.org/10.1007/s10751-006-9394-2
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DOI: https://doi.org/10.1007/s10751-006-9394-2