Synthesis and Characterisation of the Mixed-sandwich Complex closo- and its Charge-transfer Salts; Crystal Structure of (1+)(.1-)*CH2Cl2 (ddq = 2,3-dichloro-5,6-dicyano-p-benzoquinone)

DOI: 10.1039/DT9950002509

Source and publish data:

Journal of the Chemical Society, Dalton Transactions p. 2509 - 2514 (1995)

Update date:2022-08-04

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Authors:

Yan, Yaw-Kai

Mingos, D. Michael P.

Mueller, Thomas E.

Williams, David J.

Kurmoo, Mohamedally

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Article abstract of DOI:10.1039/DT9950002509

The mixed-sandwich ferracarborane complex closo-<3-(η-C5Me5)Fe-4-Me2S-1,2-C2B9H10> has been synthesised and characterised by cyclic voltammetry, infrared, 1H and 11B NMR spectroscopy.This complex forms stable 1:1 charge-transfer salts with 2,3-dichloro-5,6-dicyano-p-benzoquinone (ddq) and 7,7,8,8-tetracyano-2,3,5,6-tetrafluoroquinodimethane.Both salts are paramagnetic between 5 and 300 K with Weiss constants of -0.9 and -0.7 K respectively.The organic radical anions do not contribute to the bulk magnetic susceptibilities of these salts.Single-crystal X-ray diffraction analysis of the ddq salt shows that the ddq(^.1-) anions form isolated stacked dimers within which there is a short interplanar separation of 2.90 Angstroem.Short S...O contacts (3.15 Angstroem) occur between the (1+) cations and the quinoidal oxygen atoms of the anions.The room-temperature electrical conductivity of single crystals of the ddq salt is less than 1E-7 S cm^-1.

Full text of DOI:10.1039/DT9950002509

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