157564-52-8Relevant academic research and scientific papers
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)
Yan, Yaw-Kai,Mingos, D. Michael P.,Mueller, Thomas E.,Williams, David J.,Kurmoo, Mohamedally
, p. 2509 - 2514 (2007/10/03)
The mixed-sandwich ferracarborane complex closo- 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.
