Molecular compounds based on DT-TTF and Au(cdc)(2) complex. Structural, magnetic and electrical properties

resumo

The synthesis and characterisation of two new radical ion salts based on the donor dithiophenetetrathiafulvalene (DT-TTF) and the anion Au(cdC)(2)(-) (cdc = cynanodithioimido carbonate) are described. These salts were characterised as the mixed valence compound (DT-TTF)(2)(Au(cdc(2)) (1) and the completely ionic salt (DT-TTF)(Au(cdc)(2) (2). The X-ray crystal structure of both compounds show that they are formed by chains of donor molecules separated by anions, but, whereas in compound 2 the donors form uniform stacks, in compound I they are dimerised. The electrical conductivity measured in a single crystal at room temperature is 0.2 S cm(-1) for 1 and 1.7 x 10(-2) S cm(-1) for 2, both revealing semiconducting behaviour. Magnetic measurements indicate strong anti ferromagnetic interactions between the donors in compound 2, and a possible spin-Peierls transition at low temperature for compound 1. (C) 2003 Elsevier Science Ltd. All rights reserved.

palavras-chave

METAL COMPLEXES; SPIN LADDERS; SUPERCONDUCTIVITY

categoria

Chemistry; Crystallography

autores

Ribas, X; Mas-Torrent, M; Rovira, C; Veciana, J; Dias, JC; Alves, H; Lopes, EB; Almeida, M; Wurst, K

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