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A crystal engineering study of molecular electronic behaviour in TCNQ salts

A crystal engineering study of molecular electronic behaviour in TCNQ salts
A crystal engineering study of molecular electronic behaviour in TCNQ salts
This thesis explores the “crystal engineering” of the solid-state behaviour of a series of alkali metal TCNQ salts. This can exhibit a variety of electronic and magnetic properties, depending on the solid-state architecture. TCNQ is a good one-electron acceptor and the resulting radical anion salt is quite stable. The architectural behaviour of TCNQ salts is very dependent on the nature of the counter-cation and the stoichiometry of the material. In the present study, the effect of ionophore-encapsulation of the cation (M = Li, Na, K, Rb and Cs) has been explored using single crystal X-ray diffraction, IR, Raman, EPR and pressed discs conductivity measurements. In addition, the effect of changing the ionophore:metal cation ratio and the presence of additional TCNQ0 has been investigated. 25 new crystal structures have been obtained and analysed in detail and this has grown new insight into the impact of the effect of controlling ion pair interactions through ionophore complexation and of steric factors on the nature of TCNQ assemblies adopted. A range of solid-state motifs have been observed including some novel solid-state behaviour. In addition, the solid-state behaviour of two hydrated lanthanide TCNQ salts has been investigated.
Yan, Bingjia
f15338c5-af00-41cf-9bd5-95f5f30ca617
Yan, Bingjia
f15338c5-af00-41cf-9bd5-95f5f30ca617
Grossel, Martin
403bf3ff-6364-44e9-ab46-52d84c6f0d56

(2016) A crystal engineering study of molecular electronic behaviour in TCNQ salts. University of Southampton, Department of Chemistry, Doctoral Thesis, 393pp.

Record type: Thesis (Doctoral)

Abstract

This thesis explores the “crystal engineering” of the solid-state behaviour of a series of alkali metal TCNQ salts. This can exhibit a variety of electronic and magnetic properties, depending on the solid-state architecture. TCNQ is a good one-electron acceptor and the resulting radical anion salt is quite stable. The architectural behaviour of TCNQ salts is very dependent on the nature of the counter-cation and the stoichiometry of the material. In the present study, the effect of ionophore-encapsulation of the cation (M = Li, Na, K, Rb and Cs) has been explored using single crystal X-ray diffraction, IR, Raman, EPR and pressed discs conductivity measurements. In addition, the effect of changing the ionophore:metal cation ratio and the presence of additional TCNQ0 has been investigated. 25 new crystal structures have been obtained and analysed in detail and this has grown new insight into the impact of the effect of controlling ion pair interactions through ionophore complexation and of steric factors on the nature of TCNQ assemblies adopted. A range of solid-state motifs have been observed including some novel solid-state behaviour. In addition, the solid-state behaviour of two hydrated lanthanide TCNQ salts has been investigated.

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Published date: 18 February 2016
Organisations: University of Southampton, Chemistry

Identifiers

Local EPrints ID: 392934
URI: http://eprints.soton.ac.uk/id/eprint/392934
PURE UUID: 94901267-bb2a-4f81-a40c-4b0157bc9f4a
ORCID for Martin Grossel: ORCID iD orcid.org/0000-0001-7469-6854

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Date deposited: 22 Apr 2016 14:31
Last modified: 18 Feb 2019 05:01

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