Effect of N-substitution in multinuclear complexes allows interplay between magnetic states and multistability investigated by Mössbauer spectroscopy |
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Authors: | F Renz D Hill P Kerep M Klein R Müller-Seipel F Werner |
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Institution: | (1) Institut für Anorganische Chemie und Analytische Chemie, Johannes Gutenberg-University, Duesbergweg 10-14, 55099 Mainz, Germany |
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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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Keywords: | nonanuclear complex high-spin molecule Fe(III)-Mo(IV) multiple spin transition |
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