Structural and optical investigations of charge transfer complexes involving the radical anions of TCNQ and F4TCNQ
| Autor: | Ashley L. Sutton, Pavel M. Usov, Brendan F. Abrahams, Deanna M. D'Alessandro, Richard Robson, Timothy A. Hudson |
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| Rok vydání: | 2016 |
| Předmět: |
Chemistry
Band gap Valency 02 engineering and technology General Chemistry Crystal structure 010402 general chemistry 021001 nanoscience & nanotechnology Condensed Matter Physics 01 natural sciences Acceptor 0104 chemical sciences law.invention Metal Crystallography law visual_art visual_art.visual_art_medium Molecule General Materials Science Absorption (chemistry) 0210 nano-technology Electron paramagnetic resonance |
| Zdroj: | CrystEngComm. 18:8906-8914 |
| ISSN: | 1466-8033 |
| Popis: | The structures and optical band gaps of twelve radical anionic 7,7,8,8-tetracyanoquinodimethane (TCNQ) and 7,7,8,8-tetracyano-2,3,4,5-tetrafluoroquinodimethane (F4TCNQ) based charge-transfer complexes are reported. The compounds described have been categorised into three general types based upon solid-state arrangements of the donor and acceptor molecules. Crystallographic, EPR and IR spectroscopic investigations indicated that both TCNQ and F4TCNQ in each of the compounds described exist in the radical monoanion form. Visible-NIR absorption measurements indicate optical band gaps in the range of 0.79 to 1.08 eV. Whilst the packing arrangements in CT complexes are known to affect the band gap, in the cases considered here no clear relationship between the packing arrangement and the optical band gap is apparent. The results suggest that in the absence of mixed valency the packing arrangement does not impact significantly upon the magnitude of the optical band gap. |
| Databáze: | OpenAIRE |
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