6533b7ddfe1ef96bd1273c1a

RESEARCH PRODUCT

Molecular switching complexes with iron and tin as central atom

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Abstract The precursor [Fe III (L)Cl] (LH 2  =  N , N ′-bis(2′-hydroxy-benzyliden)-1,6-diamino-3-N-hexane is a high-spin ( S  = 5/2) complex. This precursor is combined with the bridging units [Sn IV (X) 4 ] (X = CN − , NCS − ) to yield star-shaped pentanuclear clusters, [(LFe III –X) 4 Sn]Cl 4 . For X = CN − the 57 Fe-Mossbauer data show a multiple spin transition between iron(III) in the high-spin and low-spin state, while the 119m Sn-Mossbauer data indicate a valence tautomerism between Sn(IV) and Sn(II). Changing the bridging unit from X = CN − to X = NCS − turns the switchability off.