2915-84-6Relevant articles and documents
High Tg fluorene-based hole-transporting materials for organic light-emitting diodes
Shao, Ke-Feng,Li, Ying-Feng,Yang, Lian-Ming,Xu, Xin-Jun,Yu, Gui,Liu, Yun-Qi
, p. 1604 - 1605 (2005)
A new series of fluorene-based hole-transporting materials, 9,9-bis[4-(di-p-tolylamino)phenyl]-2,7-bis(diphenylamino)fluorene (1), 9,9-bis[4-(di-p-tolylamino)phenyl]-2,7-bis(di-p-tolylamino)fluorene (2), 9,9-bis[4-(di-p-tolylamino)phenyl]-2,7-bis(2-naphth
Tuning HOMO-LUMO levels: Trends leading to the design of 9-fluorenone scaffolds with predictable electronic and optoelectronic properties
Eakins, Galen L.,Alford, Joshua S.,Tiegs, Brandon J.,Breyfogle, Bryan E.,Stearman, Chad J.
, p. 1119 - 1128 (2011)
Highest occupied molecular orbital-lowest unoccupied molecular orbital (HOMO-LUMO) tuning is an important consideration in the development of organic-based semiconducting materials. A study of the specific effects and overall trends for the HOMO-LUMO tuning of a diverse series of 9-fluorenones by means of extended conjugation and substituent effects is described. Trends were explored in a range of compounds, beginning with structures having highly electron-withdrawing substituents and progressing to structures having highly electron-donating substituents. Compounds with an incremental increase in conjugation were also examined. Electrochemical and optical measurements were used to calculate the HOMO-LUMO levels and HOMO-LUMO bandgap (HLG) for each structure. Results from both methods were compared and correlated with the differences in molecular structure. Increasing the electron-donating character of the substituents was observed to decrease the HLG and increase the energy levels of the HOMO and the LUMO, whereas an increase in the electron-withdrawing character produced the opposite results. Increasing conjugation decreased the HLG, increased the HOMO energy level, but decreased the LUMO energy level. Spectroscopic evidence of substituent influence on the carbonyl suggests that substituents directly impact the HLG by influencing the availability of nonbonding electrons within the carbonyl, which impacts the probability of an nπ* transition. The data presented not only elaborate on the HOMO-LUMO tuning of 9-fluorenone systems but also enable the consideration of 9-fluorenones as analogous models for HOMO-LUMO tuning in other more complex polyaromatic systems such as bifluorenylidenes. These trends may provide insight into developing materials with specifically tuned HLGs and HOMO-LUMO levels for a variety of applications. Copyright
2,7-Disubstituted amidofluorenone derivatives as inhibitors of human telomerase
Perry, Philip J.,Read, Martin A.,Davies, Rhian T.,Gowan, Sharon M.,Reszka, Anthony P.,Wood, Alexis A.,Kelland, Lloyd R.,Neidle, Stephen
, p. 2679 - 2684 (1999)
Telomerase is a major new target for the rational design of novel anticancer agents. We have previously identified anthraquinone-based molecules capable of inhibiting telomerase by stabilizing G-quadruplex structures formed by the folding of telomeric DNA
METHODS FOR PRODUCING DIAMINOFLUORENOL
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Paragraph 0114-0118, (2020/09/08)
The present invention relates to a method for producing diaminofluorenol, and more particularly, to a 2,7-diamino-9H-fluoren-9-ol compound and a method for producing the same. According to the present invention, it is possible to provide a diaminofluorenol-based compound that can be favorably used as an intermediate important for the synthesis of diaminofluorenol compounds of various embodiments in a high yield and simple synthesis process. The compound is represented by chemical formula 1.COPYRIGHT KIPO 2020
A New Photocage Derived from Fluorene
Reinfelds, Matiss,von Cosel, Jan,Falahati, Konstantin,Hamerla, Carsten,Slanina, Tomá?,Burghardt, Irene,Heckel, Alexander
supporting information, p. 13026 - 13035 (2018/09/10)
Photolabile protecting groups (PPGs or photocages) are increasingly subject to molecular design to meet requirements such as absorbance in the visible spectral range, high molar absorption coefficients, and high quantum yields of leaving group release. Improvements in these properties for the promising 3-diethylaminobenzyl (DEAMb) photocage, the photoactivity of which is based on the Zimmerman meta effect, are reported. Expansion of the aromatic system with a second aromatic ring resulted in improved spectral properties. A systematic trend relating the electronic (π-donor or acceptor) properties of the new aryl substituent and its position in the DEAMb ring to changes in the spectral properties could be observed. Conclusions from the experimental results were supported by computations obtained by using time-dependent DFT. A second generation of DEAMb-based photocages was designed. A rigid linker was introduced to ensure more efficient conjugation of the aromatic ring π systems by limiting rotational freedom. The resulting fluorenol (9-hydroxyfluorene)-based photocages had superior spectral properties to those of simple biphenyl systems. The best uncaging cross section achieved was 5320 m?1 cm?1 (?Φ365).
