129-79-3Relevant articles and documents
A new method for recycling asymmetric catalysts via formation of charge transfer complexes
Chollet, Guillaume,Rodriguez, Fernand,Schulz, Emmanuelle
, p. 539 - 542 (2006)
A new concept for recycling asymmetric bis(oxazoline)-type catalysts is reported. The formation of charge-transfer complexes between the chiral ligand and trinitrofluorenone and their subsequent precipitation and reuse by addition of new substrate solutions is described. The efficiency of this procedure is demonstrated in a Diels-Alder reaction to reach the expected endo product as major isomer (up to 97% de and 94% ee): the catalyst was used up to 12 times without loss of either activity or selectivity.
Ray,Francis
, p. 52,53 (1943)
Nitroaromatics as n-type organic semiconductors for field effect transistors
Ghamari, Pegah,Hamzehpoor, Ehsan,Niazi, Muhammad Rizwan,Perepichka, Dmitrii F.,Perepichka, Igor F.
, p. 6432 - 6435 (2020)
The nitro group (NO2) is one of the most common electron-withdrawing groups but it has rarely been used in the design of organic semiconductors (OSCs). Herein, we report the n-type semiconducting behavior of simple fluorenone derivatives functionalized with NO2and CN groups. While the electron mobilities measured in the thin film field-effect transistors are modest (10?6-10?4cm2V?1s?1), the nitrofluorenone OSCs offer excellent air-stability and remarkable tunability of energy levelsviafacile modification of the substitution pattern. We study the effect of substituents on the electrochemical properties, molecular and crystal structure, and the charge transport properties of nitrofluorenones to revitalize the underestimated potential of NO2functionalization in organic electronics.
A Charge-Transfer-Induced Self-Healing Supramolecular Hydrogel
Gao, Lei,Gao, Yuxia,Lin, Yuan,Ju, Yong,Yang, Song,Hu, Jun
, p. 3430 - 3435 (2016)
In this study, a dual-component charge-transfer (CT)-induced supramolecular hydrogel was fabricated using pyrene-tailored pyridinium (PYP) and 2,4,7-trinitrofluorenone (TNF) as the electron donor and acceptor, respectively. Its thermal stability and mechanical property have been modulated effectively by altering the concentration or molar ratio of PYP and TNF. Moreover, this CT hydrogel exhibited a distinct injectable self-healing property that could be utilized to create desired patterns on substrates. Such property holds potential for this CT hydrogel in fields like three-dimensional printing and surface coating.
Melz
, p. 1694 (1972)
Self-assembly of dendronized triphenylenes into helical pyramidal columns and chiral spheres
Percec, Virgil,Imam, Mohammad R.,Peterca, Mihai,Wilson, Daniela A.,Graf, Robert,et al.
supporting information; experimental part, p. 7662 - 7677 (2009/10/17)
The synthesis and structural and retrostructural analyses of a library containing 10 triphenylenes functionalized with self-assembling benzyl ether and phenyl propyl ether dendrons are reported. These dendronized triphenylenes adopt a crown rather than discotic conformation. Their crown conformation mediates the self-assembly of the discotic triphenylene unit in helical pyramidal columns and in chiral spheres. The chiral spheresare generated from short segments of helical pyramidal columns that are spherically distorted. Therefore, the chirality of the sphere is determ ined by a short helical pyramidal column that represents the inner part of the supramolecular sphere. Both the helical pyramidal columns and thechiral spheres represent supramolecular architectures that were self-as sembled for the first time from discotic molecules. The helical pyramidal columns self-organize in various hexagonal and rectangular lattices, while the chiral spheres self-organize into cubic and tetragonal periodicarrays and into a quasiperiodic 12-fold liquid quasicrystal. The helica l sense of the helical pyramidal columns and of helical spheres is selected by a stereocenter that can be incorporated either in the alkyl groups of the dendron or in the triphenylene part of the dendritic crown via donor-acceptor interactions. The self-assembly process of the dendronized triphenylene donor can be programmed by a new supramolecular "polymer effect" generated by donor-acceptor interactions.
