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Issue 31, 2007
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Multi-layered molecular charge-transfer salts containing alkali metal ions

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Abstract

The synthesis, crystal structure and physical properties of two new BEDT-TTF charge-transfer salts containing the tris(oxalato)ferrate(III) anion are described. The most commonly found tris(oxalato)metallate(III) salts of BEDT-TTF contain alternating layers of BEDT-TTF cations and tris(oxalato)metallate anions, but the two salts reported here are multi-layered structures. Compound I is of the type ABCDABCDA as observed previously in the proton-conducting compound β″-(BEDT-TTF)4[Fe(C2O4)3]2·18-crown-6·9HxO and the alpha–beta family of salts α,β″-(BEDT-TTF)4[(NH4)Ga/Fe(C2O4)3]·G (G = PhN(CH3)COH, PhCH2CN and PhCOCH3). In α‴-(BEDT-TTF)9[Fe(C2O4)3]8Na18(H2O)24 (I) the A layers consist of only BEDT-TTF, B/D layers consist of tris(oxalato)ferrate(III) and sodium, and the C layers consist of sodium and water. In α-(BEDT-TTF)10(18-crown-6)6K6[Fe(C2O4)3]4(H2O)24 (II) the packing is of a type not seen before, ABCBABCBA. The A layers in II consist of only BEDT-TTF, B layers consist of tris(oxalato)ferrate(III), potassium, water and 18-crown-6, and C layers consist of 18-crown-6, potassium and water. Both salts are semiconductors between room temperature and 140 K.

Graphical abstract: Multi-layered molecular charge-transfer salts containing alkali metal ions

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Publication details

The article was received on 15 Feb 2007, accepted on 22 May 2007 and first published on 29 May 2007


Article type: Paper
DOI: 10.1039/B702442H
Citation: J. Mater. Chem., 2007,17, 3324-3329
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    Multi-layered molecular charge-transfer salts containing alkali metal ions

    L. Martin, P. Day, W. Clegg, R. W. Harrington, P. N. Horton, A. Bingham, M. B. Hursthouse, P. McMillan and S. Firth, J. Mater. Chem., 2007, 17, 3324
    DOI: 10.1039/B702442H

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