Topic
Fluorenone
About: Fluorenone is a research topic. Over the lifetime, 1067 publications have been published within this topic receiving 17162 citations. The topic is also known as: Diphenylene ketone & 9-Oxofluorene.
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TL;DR: In this paper, it is shown that the instantaneously formed FIN2+˙ is consumed in a rapid process which is second order with respect to the cation radical and has a rate constant of 1.9 × 108 l mol −1 s−1; it is suggested that this process is cationradical dimerisation.
Abstract: The decomposition of 9-diazofluorene (FIN2) brought about at a platinum anode or by chemical oxidants, Cu(BF4)2 or (p-BrC6H4)3N+˙SbCl6–, in CH3CN solution leads to formation of mixtures of bifluorenylidene and fluorenone azine in high yield. The reactions have been studied kinetically by conventional means and using the transient electrochemical techniques derivative linear sweep voltammetry (I.s.v.) and derivative cyclic voltammetry (d.c.v.). Constant-current electrolysis of FIN2 shows the characteristics of a chain process. The chemical oxidants give rise to a rate law –d[FIN2]/dtk[FIN2][oxidant] above a critical oxidant level, and the value of k is the same for both oxidants, even though their oxidation potentials are substantially different. It is inferred that the process studied is the chain propagation step in which the chain carrier reacts with a molecule of FIN2. Under the conditions of I.s.v. and d.c.v. experiments, it is shown that the instantaneously formed FIN2+˙ is consumed in a rapid process which is second order with respect to the cation radical and has a rate constant of 1.9 × 108 l mol –1 s–1; it is suggested that this process is cation radical dimerisation. Since the product of this step rapidly yields bifluorenylidene, it is argued that the slower macroscopic chain reaction do not involve dimerisation, but rather that FIN2+˙ rapidly attacks a further FIN2 molecule to generate the chain carrier which must have a lower oxidation potential than FIN2+˙. Possible structures for the chain carrier are considered in the light of earlier e.s.r. evidence for a radical intermediate.
3 citations
TL;DR: In this article, the photophysical properties of 3-azafluorenone have been studied in acetonitrile at room temperature (296 K) and its fluorescence quantum yield and fluorescence lifetime were found to be lower than those of fluorenone due to the higher rate of nonradiative processes.
Abstract: Photophysical properties of 3-azafluorenone have been studied in acetonitrile at room temperature (296 K). Its fluorescence quantum yield and fluorescence lifetime were found to be lower than those of fluorenone due to the higher rate of nonradiative processes.
3 citations
TL;DR: In this article, a fluorenone derivative of 2-amino-9-fluorenone and mercapto-2-butanone is synthesized and characterized using IR, NMR, and mass spectral techniques.
Abstract: In this paper, we report a turn-on fluorescence sensing of Al3+ ion using a new fluorenone derivative. The imino derivative of 2-amino-9-fluorenone and mercapto-2-butanone is synthesized and characterized using IR, NMR, and mass spectral techniques. The fluorescence of the compound shows a large enhancement at the addition of Al3+ ions, and other metal ions show insignificant changes of the fluorescence. The stoichiometry and the binding constant of the complex are reported. The detection limit of the Al3+ determination by the fluorenone derivative is 5 × 10–8 M. A visible enhancement of color occurs on illumination of the fluorescent compound – Al3+ ion complex.
3 citations
Journal Article•
3 citations
3 citations