Spin transition in heptanuclear star-shaped iron(III)–antimony(V) NCS- and CN-bridged compounds |
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| Authors: | F Renz C Zaba L Roßberg St Jung M Klein G Klingelhöfer A Wünsche S Reinhardt M Menzel |
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| Institution: | 1. Institute for Inorganic Chemistry and Analytical Chemistry, Johannes Gutenberg-University, Duesbergweg 10-14, D-55099 Mainz, Germany;2. Institute for Inorganic Chemistry, Leibniz University Hannover, Callin Str. 9, D-30167 Hannover, Germany;3. Federal Institute for Materials Research and Testing (BAM), Richard-Willstätter Str. 11, D-12489 Berlin, Germany |
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| Abstract: | The precursor FeIII(L)Cl] (LH2 = N,N′-bis(2′-hydroxy-benzyliden)-1,6-diamino-3-azahexane) has been prepared and Mössbauer spectroscopy assigned a high-spin (S = 5/2) state at room temperature. The precursor is combined with the bridging units SbV(X)6]? (X = CN?, NCS?) to yield star-shaped heptanuclear clusters (LFeIII–X)6SbV]Cl5. The star-shaped compounds are in general high-spin systems at room temperature. On cooling to 20 K some of the iron(III) centers switch to the low-spin state as indicated by Mössbauer spectroscopy, i.e. multiple electronic transitions. While the cyano-bridged complex performs a multiple spin transition the thiocyanate-compound shows no significant population at both temperatures. |
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