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.

Photodetachment spectroscopy of fluorenone radical anions microsolvated with methanol: Rationalizing the anomalous solvatochromic behavior due to hydrogen bonding

Abstract: The attribution of the extraordinary blue shift for the intramolecular charge-transfer absorption band of fluorenone radical anion solvated in protic media was investigated by means of photodetachment spectroscopy of the gas-phase anions microsolvated with methanol, in conjunction with quantum chemical calculations based on density functional theory. Sequential shifts of the vertical detachment energy as a function of the cluster size are consistent with theoretical predictions, where up to two methanol molecules can directly attach to the carbonyl group. In the photodetachment excitation spectra as alternatives to the photoabsorption spectra, with increasing cluster size, a new absorption band grows in the higher-energy region, which coincides with the blue-shifted band in protic media. Spectral simulations using time-dependent density functional theory with the CAM-B3LYP functional reproduced the feature of the phenomenon. Analyses on the electronic configuration elucidated that the extraordinarily blue...

Theoretical investigation of ground- and excited-state properties of fluorenone–alkynyl Hg(II) complexes: The tuning of electronic spectroscopy

Abstract: The electronic properties of R C C H (1), [R C C HgCH3] (2), [CH3Hg C C R C C HgCH3] (3) and [R C C Hg C C R] (4) (R = fluoren-9-one) in the ground and singlet/triplet excited states were explored theoretically. Calculations indicate that geometry parameters of 1–4 change slightly on going from ground state to excited state. Experimental spectra were well reproduced by the combined TD-DFT (time-dependent density functional theory) and PCM (Polarized-Continuum Model) calculations. With increasing methylmercury and/or fluorenone groups, the featured absorption and emission bands of complexes are redshifted. The investigation reveals such a variation can tune excitation energies but not change transition nature.

Method for increasing the hydrogen:carbon ratio of an organic compound

Abstract: A method for increasing the hydrogen:carbon ratio of an organic compound is disclosed. The organic compound can be one having any of the following functions: hydroxyl, carbonyl, epoxide, acetal, ketal, hemiacetal and hemiketal. The method involves introducing the organic compound and a silicon hydride into a liquid which is either chemically inert or acidic and introducing BF3 into the liquid to produce a reaction product having a higher hydrogen:carbon ratio than the starting organic compound. Examples of organic compound starting materials disclosed include undecanal, benzaldehyde, p-methylbenzaldehyde, p-chlorobenzaldehyde, p-methoxybenzaldehyde, p-cyanobenzaldehyde, p-nitrobenzaldehyde, 2-undecanone, cyclohexanone, 2-methylcyclohexanone, adamantanone, p-cyanoacetophenone, fluorenone, 1-naphthaldehyde, p-nitroacetophenone, fructose and cotton. The use, as the silicon hydride, of triethylsilane, (R)-(+)-1-naphthylphenylmethylsilane, dimethylethylsilane, phenylneopentylmethylsilane, and of tri-n-hexylsilane is disclosed, while methylene chloride is disclosed as the liquid in which the reaction is conducted.