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

Yan, Y. and Mingos, D. M. P. and Kurmoo, M. and Li, W. and Scowen, I. J. and McPartlin, M. and 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
Item Status:Live Archive

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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