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À propos de : Electron Acceptors of the Fluorene Series. 7.2,7-Dicyano-4,5-dinitro-9-X-fluorenes: Synthesis, CyclicVoltammetry, Charge Transfer Complexation withN-Propylcarbazole in Solution, and X-ray Crystal Structures ofTwo Tetrathiafulvalene Complexes        

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  • Electron Acceptors of the Fluorene Series. 7.2,7-Dicyano-4,5-dinitro-9-X-fluorenes: Synthesis, CyclicVoltammetry, Charge Transfer Complexation withN-Propylcarbazole in Solution, and X-ray Crystal Structures ofTwo Tetrathiafulvalene Complexes
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  • The synthesis and physical properties of a series of novel fluorene π-electron acceptors (7−9) aredescribed. Cyclic voltammograms of 7 and 8 exhibit three separate reversible (or quasi-reversible)one-electron redox waves, characteristic of strong electron acceptors. Spectroelectrochemicalexperiments show the appearance in the long-wavelength visible region of absorption bands atappropriate potentials which were attributed to the transformations A → A•- and A•- → A2-. Charge-transfer complexation with N-propylcarbazole in dioxane shows the formation of 1:1 complexeswith parameters characteristic for other fluorene acceptors. The single-crystal X-ray structures of1:1 charge-transfer complexes of tetrathiafulvalene with the electron acceptor 8 and with thestrongest fluorene acceptor 1f both show ··A···D···A···D·· stacking in the crystal.
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