Hyperfine Interactions

, Volume 168, Issue 1–3, pp 1001–1007 | Cite as

Chemical tuning of high-spin complexes based on 3- and 4-hydroxy-pentadentate-Fe (III) complex-units investigated by Mössbauer spectroscopy



The pentadentate ligands 3-OH-5L = [N,N′-Bis(1,3-dihydroxy-2-benzylidene)-1,7-diamino-4-azaheptane] and 4-OH-5L = [N,N′-Bis(1,4-dihydroxy-2-benzylidene)-1,7-diamino-4-azaheptane] has been prepared by a Schiff base condensation between 1,7-diamino-4-azaheptane and the dihydroxybenzaldehyde. Complexation with Fe(III) yields high-spin (S = 5/2) complexes of [FeIII(3-OH-5L)Cl] and [FeIII(4-OH-5L)Cl]. These precursors were combined with [M(CN) x ] y (M = W(IV), Mo(IV), Ru(II), Co(III)) and heptanuclear and nonanuclear clusters of [M{(CN-FeIII(3-OH-5L)} x ]Cl y and [M{(CN-FeIII(4-OH-5L)} x ]Cl y resulted. Such starshaped hepta- and nonanuclear compounds are high-spin systems at room temperature. On cooling to 10 K some of the iron(III) centers switch to a second high-spin state as proven by Mössbauer spectra, i.e. multiple electronic transitions. Parts of the compounds perform a high-spin to high-spin transition.

Key words

heptanuclear nonanuclear high-spin molecule Fe(III)–W(IV) Fe(III)–Mo(IV) Fe(III)–Ru(II) Fe(III)–Co(III) multiple electronic transition 


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Copyright information

© Springer Science+Business Media, Inc. 2006

Authors and Affiliations

  1. 1.Institut für Anorganische Chemie und Analytische ChemieJohannes Gutenberg-UniversitätMainzGermany

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