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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Patent•
30 Dec 1968
TL;DR: NOVEL BIS-BASIC ETHERS and THIOETHERS of FLUORENONE were selected from a base of the formulae DI(X-Y-)FLUORENE.
Abstract: NOVEL BIS-BASIC ETHERS AND THIOETHERS OF FLUORENONE, FLUORENOL AND FLUORENE SELECTED FROM A BASE OF THE FORMULA DI(X-Y-)FLUORENE WHEREIN: Z IS OXYGEN, H2 OF H,OH; EACH Y IS OXYGEN OR SULFUR; AND EACH X IS (A) THE GROUP -A-N(-R1)-R WHEREIN A IS ALKYLENE OF 2 TO ABOUT 8 CARBON ATOMS AND SEPARATES THE AMINO NITROGEN THEREOF AND Y BY AN ALKYLENE CHAIN OF AT LEAST 2 CARBON ATOMS, EACH R AND R1 IS HYDROGEN, (LOWER) ALKYL, CYCLOALKYL OF 3 TO 6 RING CARBON ATOMS, ALKENYL OF 3 TO 6 CARBON ATOMS HAVING THE VINYL UNSUTURATION IN OTHER THAN THE 1-POSITION OF THE ALKENYL GROUP, OR EACH SET OF R AND R1 TAKEN TOGETHER WITH THE NITROGEN TO WHICH THEY ARE ATTACHED IS PYRROLIDINO, PIPERIDINO, N(LOWER) ALKYLPIPERZINO, OR MOROPHOLIONO; OR EACH X IS (B) THE GROUP CH2<(-N(-R2)-(CH2)M-CH2-CH2)(-(CH2)N-) WHEREIN N IS A INTEGER OF 0 TO 2, M IS 1 OR 2 AND R2 IS HYDROGEN, (LOWER) AKLYL, OR ALKENYL OR 3 TO 6 CARBON ATOMS HAVING THE VINYL UNSATURATION IN OTHER THAN THE 1-POSITION OF THE ALKENYL GROUP; OR A PHARMACEUTICALLY ACCEPTABLE ACID ADDITION SALT OF SAID BASE. THESE COMPOUNDS CAN BE USED AS PHARMACEUTICALS FOR PREVENTING OR INHIBITING A VIRAL INFECTION
22 citations
TL;DR: It is reasonable to conclude that not only the van der Waals forces but also the dipole-dipole interactions from both the fluorenone cores and the ester alkoxy chains play critical roles in the self-assemblies of BAF-Cn.
Abstract: Two-dimensional supramolecular assemblies of a series of 2,7-bis(10-n-alkoxycarbonyl-decyloxy)-9-fluorenone derivatives (BAF-Cn, n = 1, 3-6) consisting of polar fluorenone moieties and ester alkoxy chains were investigated by scanning tunneling microscopy on highly oriented pyrolytic graphite surfaces. The chain-length effect was observed in the self-assembly of BAF-Cn. Self-assembly of BAF-C1 was composed of a linear I pattern, where the side chains adopted a fully interdigitated arrangement. As the length of side chains increased, the coexistence of a linear I pattern and a cyclic pattern for the self-assembly of BAF-C3 was observed. Upon increasing the length of the alkoxy chain even further (n = 4-6), another linear II structure was observed in the BAF-Cn monolayer, in which the side chains in adjacent rows were arranged in a tail-to-tail configuration. It is reasonable to conclude that not only the van der Waals forces but also the dipole-dipole interactions from both the fluorenone cores and the ester alkoxy chains play critical roles in the self-assemblies of BAF-Cn. Our work provides detailed insights into the effect of intermolecular dipole-dipole and van der Waals interactions on the monolayer morphology of fluorenone derivatives.
21 citations
TL;DR: The ground-state and excited-state electronic structures as well as the tunable optical properties of a variety of newly designed fluorenone-based molecular materials have been theoretically investigated using density functional theory (DFT) and time-dependent density functional theories (TDDFT).
Abstract: The ground-state and excited-state electronic structures as well as the tunable optical properties of a variety of newly designed fluorenone-based molecular materials have been theoretically investigated using density functional theory (DFT) and time-dependent density functional theory (TDDFT) methods. The substitutes on the O atom in the carbonyl group of the fluorenone (FN) molecule with S (FN—C═S), Se (FN—C═Se), and Te (FN—C═Te) atoms can significantly influence their electronic structures, molecular orbitals, geometric conformations, and optical properties of fluorenone-based molecular materials. Due to the important difference of electronegativity for O, S, Se, and Te atoms in the same group, the ground-state dipole moment of these fluorenone-based molecular materials is gradually decreased in the order FN, FN—C═S, FN—C═Se, and FN—C═Te. At the same time, the ground-state bond length of the C═X (X refers O, S, Se, and Te) is gradually increased in the order of FN, FN—C═S, FN—C═Se, and FN—C═Te. Due to ...
21 citations
TL;DR: In this article, a series of fluorene and fluorenone diamines were polymerized with two aromatic dianhydrides, and the resulting polyamic acids were cyclodehydrated to aromatic polyimides.
Abstract: A series of fluorene and fluorenone diamines were polymerized with two aromatic dianhydrides, and the resulting polyamic acids were cyclodehydrated to aromatic polyimides. A study of the mechanical properties of the polyimide films disclosed they are among the stiffest reported to date, with an excellent retention of rigidity at elevated temperatures. Comparisons of the tensile properties and glass transition temperatures of the fluorene-derived polymer films with those from the corresponding open-chain polyimide films established that the unusual rigidity, especially at elevated temperatures, was in large part due to the contribution of the bulky, tricyclic fluorene (one) moieties in the polymer structures.
21 citations
Patent•
03 Oct 1985
TL;DR: In this article, a method for making 9,9-bis-(4-hydroxyphenyl)-fluorene by reacting fluorenone with phenol at a temperature from 20° to 100° C.
Abstract: A method for making 9,9-bis-(4-hydroxyphenyl)-fluorene by reacting fluorenone with phenol at a temperature from 20° to 100° C. in the presence of sulfuric acid of a concentration higher than 70 percent and of a mercaptan, and particularly beta-mercaptopropionic acid, as acidic condensing agents.
21 citations