Solvent Induced Transitions in TCNQ Salts
- 1 July 1986
- journal article
- research article
- Published by Taylor & Francis in Molecular Crystals and Liquid Crystals
- Vol. 137 (1) , 191-202
- https://doi.org/10.1080/00268948608070922
Abstract
Differential scanning calorimetry (DSC) has revealed transitions close to 229 K and 214 K in TCNQ salts prepared from acetonitrile solution but no transitions in the salts recrystallised from ethyl acetate, ethanol and acetone or mixtures of these solvents. The double transition is characteristic of acetonitrile and may be attributed to the melting point at 229 K and to a solid state transformation at 214 K. It is assumed that solvent is trapped in pockets within the crystal lattice. A comparison of the enthalpy data of acetonitrile and the TCNQ salts shows the solvent concentration to be as high as 0.14 moles per mole of the TCNQ salt. The conductivity and magnetic susceptibility show anomalous behaviour close t o 229 K.Keywords
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