Please use this identifier to cite or link to this item: http://hdl.handle.net/11455/60434
標題: Direct observation of mixed-valence and radical cation dimer states of tetrathiafulvalene in solution at room temperature: Association and dissociation of molecular clip dimers under oxidative control
作者: Chiang, P.T.
賴建成
Chen, N.C.
Lai, C.C.
Chiu, S.H.
關鍵字: cation radical dimer
mixed-valent compounds
molecular machines
supramolecular chemistry
tetrathiafulvalene
electron-transfer
solid-state
supramolecular chemistry
aromatic
hydrocarbons
self-association
building-blocks
pi-dimers
ttf
switch
complex
期刊/報告no:: Chemistry-a European Journal, Volume 14, Issue 21, Page(s) 6546-6552.
摘要: We have observed the mixed-valence and radical cation dimer states of a glycoluril-based molecular clip with tetrathiafulvalene (TTF) side-walls at low concentration (1 mM) at room temperature. This molecular clip has four consecutive anodic steps in its cyclic voltammogram, which suggests a sequential oxidation of these TTF sidewalls to generate species existing in several distinct charge states: neutral monomers, mixed-valence dimers, radical cation dimers, and fully oxidized tetracationic monomers. The observation of characteristic NIR spectroscopic absorption bands at approximately 1650 and 830 nm in spectroelectro-chemistry experiments supports the presence of intermediary mixed-valence and radical cation dimers, respectively, during the oxidation process. The stacking of four TTF radical cations in the dimer led to the appearance of a charge-transfer band at approximately 946 nm. Nanoelectrospray ionization mass spectrometry was used to verify the tricationic state and confirm the existence of other different charged dimers during the oxidation of the molecular clip.
URI: http://hdl.handle.net/11455/60434
ISSN: 0947-6539
文章連結: http://dx.doi.org/10.1002/chem.200800213
Appears in Collections:分子生物學研究所

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