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 article, two orange-red emitters, 3,6-bis(9,9-dimethylacridin-10(9H)-yl)-9H-fluoren-9-one (DMAC-FO) and 3, 6-di(10H-SP[acridine-9, 9′-fluorn]-10-yl)- 9H-luoren- 9-one, based on fluorenone have been designed and synthesized.
10 citations
TL;DR: The results demonstrate that the coupling rate k1 is insensitive to changes in the steric and electronic properties of the radicals and the structure and standard potentials of the aromatic radical anions.
Abstract: Coupling rates between the radicals methyl, n-, sec-, tert-butyl and benzyl (R˙) and the aromatic radical anions of 1,4-dicyanonaphthalene, 9,10-dicyanoanthracene and fluorenone (A−˙) have been obtained using a new laser-flash photolysis method. The radicals R˙ and the radical anions A−˙ were generated by a photoinduced electron transfer reaction between the aromatic compound A and the alkyl or benzyl triphenylborate anion RB(Ph)3−. For the first time the rate constants of the coupling reaction between methyl and benzyl radicals with aromatic radical anions have been obtained. For all the measured coupling rate constants an average value of k1
= 1.9 × 109 M−1 s−1 was found with a relatively small variation in the coupling rates (0.8–2.9 × 109 M−1 s−1). The results demonstrate that the coupling rate k1 is insensitive to changes in the steric and electronic properties of the radicals and the structure and standard potentials of the aromatic radical anions.
10 citations
TL;DR: The title azine was obtained by a reaction of the corresponding fluorenone hydrazone and p-substituted benzaldehyde, and was assigned to be (s-trans/E) form as mentioned in this paper.
Abstract: The title azine was obtained by a reaction of the corresponding fluorenone hydrazone and p-substituted benzaldehyde. The hydrazone formed from the unsymmetrical fluorenone afforded configurational isomers; the E-isomer was thermodynamically more stable than the Z-isomer. The structure of the title azines, derived from symmetrical fluorenone, was assigned to be (s-trans/E) form. The azines from unsymmetrical fluorenone gave isomeric mixtures due to the 9-iminofluorene moiety. The electronic spectra of these azines show an intramolecular charge transfer; the red shift beyond 250 nm is observed in the case of 9-[p-(diethylamino)benzylidenehydrazono]-2,4,7-trinitrofluorene, compared to the mother azine. 9-[p-(Pentyloxy)benzylidenehydrazono]-2,7-dinitrofluorene and some of the homologs possess a liquid-crystalline property; the phase-transition temperature of the dinitro compound is K (172 °C) M1 (185) M2 (187) I between the crystalline and liquid phases.
10 citations
10 citations
TL;DR: In this article, a series of disazo dyes have been synthesised from diamines containing amino, carbonyl, carbamide and urea groups between biphenyl rings, and the effect of the molecular structure of the dyes on their color and affinity for cellulose fibres compared with the properties of corresponding benzidine dyes, has been studied.
10 citations