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DOI: 10.1039/A606025K (Paper) Reference Section for: J. Chem. Soc., Dalton Trans., 1997, 607-614

Quasi-one-dimensional bis(ethylenedithio)tetrathiafulvalene charge- transfer salts with paramagnetic Group 6 anions[hair space]

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Cameron J. Kepert, Mohamedally Kurmoo, Mary R. Truter and Peter Day

Abstract

Two new charge-transfer salts of BEDT-TTF [bis(ethylenedithio)tetrathiafulvalene] with paramagnetic anionic complexes of Group 6 elements have been prepared. The crystal structure of the salt [BEDT-TTF][MoOCl4(H2O)] is unusual in containing no segregated layers of cations and anions but chains of hydrogen-bonded [MoOCl4(H2O)]- sandwiched between ribbons of BEDT-TTF+ edge linked by S[hair space]·[hair space]·[hair space]·[hair space]S contacts. The structure of [BEDT-TTF]2[Cr(NCS)4(NH3)2] consists of alternating layers of [(BEDT-TTF)2]+ and [Cr(NCS)4(NH3)2]-. The molecular packing in the cation layer is unique in comprising double stacks which alternate in orientation with close S[hair space]·[hair space]·[hair space]·[hair space]S contacts not only between cations but between cations and NCS. Both compounds are semiconductors and their magnetic behaviour is dominated by the anions, though there is evidence that the cation ribbons in the molybdenum salt behave as antiferromagnetic chains (J ≈ 110 K).

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