fluorene

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fluorene

[′flu̇‚rēn]
(organic chemistry)
C13H10 A hydrocarbon chemical present in the middle oil fraction of coal tar; insoluble in water, soluble in ether and acetone, melting point 116-117°C; used as the basis for a group of dyes. Also known as 2,3-benzindene; diphenylenemethane.
References in periodicals archive ?
The polymer with fluorene gave an 82.4% yield (2.72 g), while the homologous polymer with TDR1 gave a 44% yield (1.22 g).
An oxidation of fluorenes may be ruled out as the major process for the formation of fluoren-9-ones since Posidonia Shale was deposited under anoxic conditions and fluorenes were not present in high amounts even in samples of low maturity [15].
The optimized geometry and frontier levels of the tetramer structure of alternated fluorene and terpyridine copolymer (LaPPS71) were simulated with density functional theory (DFT), using Becke, Three-Parameter, Lee-Yang-Parr functional B3LYP [22] functional, with 6-311G(d, p) split-valence basis set.
Due to the high rate of co-occurrence of certain PAH metabolites in urine samples, we infer that fluorene frequently co-occurs with pyrene, phenanthrene, and naphthalene in humans.
The compounds mainly fall into the following 12 aromatic hydrocarbon series: naphthalene (m/z 128, m/z 142, m/z 156, m/z 170, m/z 184, m/z 198), phenanthrene (m/z 178, m/z 192, m/z 206, m/z 220), benzopyrene (m/z 252), fluoranthene (m/z 202, m/z 216), dibenzothiophene (m/z 184, m/z 198, m/z 212, m/z 226), benzonaphthothiophene (m/z 234), dibenzofuran (m/z 168, m/z 182, m/z 196), fluorene (m/z 166, m/z 180, m/z 194), chrysene (m/z 228, m/z 242, m/z 256), biphenyl (m/z 154, m/z 168, m/z 182), triaromatic sterane (m/z 231) and benzohopane (m/z 191).
the incorporation of oxadiazole together with fluorene and a flexible diarylsilyl group into the same polymer chain, minimizes the trade-off between the processability and high-performance properties of wholly aromatic polyoxadiazoles.
They can be constructed using a variety of cathode materials including calcium, aluminum and magnesium alloys, and are useful in combination with a variety of hole transport layer materials including PEDOT/PSS (Baytron-P from Bayer), polyanilines and some fluorene copolymers.
They can be constructed using a variety of cathode materials 'including calcium, aluminum and magnesium alloys, and are useful in combination with a variety of hole transport layer materials including PEDOT/PSS (Baytron-P from Bayer), polyanilines and some fluorene copolymers.
Herein, fluorene and 2,1,3-benzothiadiazole are used as the main backbone copolymer in D--A structure (Scheme 1a).
Friedel-Crafts reactions of PyFA with bromo-substituted fluorene tertiary alcohol enable to synthesize compound 2.
Ratio to IS (anthracene-[d.sub.10]) PAH m/z 1 2 3 Acenaphthylene 152 4.6 5.6 1.6 Fluorene 166 1.4 2.5 0.8 Anthracene 178 7.2 10.2 6.0 Cyclopentaphenanthrene 190 1.7 2.2 1.7 Fluoranthene 202 6.2 6.4 6.7 Acephenanthrylene 202 4.0 4.4 4.3 Pyrene 202 8.0 9.6 8.7 Benzofluorenes 216 1.0 2.0 1.0 Acepyrene 226 7.6 7.2 9.8 Chrysene 228 1.3 1.4 1.2 Benzopyrenes 252 2.0 2.2 2.5 Perylene 252 1.5 1.7 1.6 Benzoperylene/indenopyrene 276 1.2 0.4 1.5 Ratio to specific IS (mg/g soot) PAH 1 2 3 Acenaphthylene Fluorene Anthracene 14.4 20.4 12.0 Cyclopentaphenanthrene Fluoranthene Acephenanthrylene Pyrene Benzofluorenes Acepyrene Chrysene 1.4 1.5 1.2 Benzopyrenes 1.7 2.0 1.7 Perylene 0.2 0.5 0.4 Benzoperylene/indenopyrene IS, internal standards.
GPC analysis revealed an Mn of 5300 g/mol, which corresponds to ten fluorene repeating units.