Synthesis, structure and physical properties of tetrathiafulvalenium salts of the ferracarborane complex commo-[3,3'-Fe{1-(C4H3S)-1,2-C2B9H10}2]-

Yan, Y., Mingos, D. M. P., Kurmoo, M. , Li, W., Scowen, I. J., McPartlin, M., Coomber, A. T. and Friend, R. H. (1995) Synthesis, structure and physical properties of tetrathiafulvalenium salts of the ferracarborane complex commo-[3,3'-Fe{1-(C4H3S)-1,2-C2B9H10}2]-. Journal of the Chemical Society, Dalton Transactions (17). pp. 2851-2860. ISSN 1477-9226, 1472-7773

Full content URL: http://dx.doi.org/10.1039/DT9950002851

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Item Type:Article
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Abstract

The sandwich complex commo-3,3�-Fe{1-(C4H3S)-1,2-C2B 9H10}2- 1 and its tetrathiafulvalenium salts ttf5Fe(C2B9H10C4H 3S)22 2 and ttfFe(C2B9H10C4H 3S)2 3 were synthesised in order to study the effect of the thiophene (C4H3S) group on the crystal packing, electrical and magnetic properties of ttf-metallacarborane salts. The crystal structure of 2 features unusual two-dimensional networks of ttf units which extend in the a and c directions. Each ttf sheet contains stacked trimers of ttf units, which propagate along the a direction, and bridging ttf units, which lie between the ttf stacks approximately orthogonally to the ttf units within the trimers. The trimers are linked along the c direction via short S � S contacts (3.56 à ) with these bridging ttf units. In contrast, the crystal structure of compound 3 contains discrete stacked dimers of ttf.+ cations. Whilst crystals of 2 are semiconducting (�300 K = 2 � 10-3 S cm-1) with an activation energy of 0.22 eV, those of 3 are insulating (�290 K � 10-7 S cm-1). Both compounds exhibit weak ferromagnetic interactions between the unpaired spins of their Fe(C2B9H10C4H3S) 2- anions, with small positive Weiss constants of 1.9 and 0.5 K respectively.

Keywords:Chemistry
Subjects:F Physical Sciences > F100 Chemistry
Divisions:College of Science > School of Chemistry
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ID Code:13106
Deposited On:19 Mar 2014 17:58

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