64706-24-7Relevant academic research and scientific papers
Two-Photon Absorption Enhancement by the Inclusion of a Tropone Ring in Distorted Nanographene Ribbons
Campa?a, Araceli G.,Castro-Fernández, Silvia,Cruz, Carlos M.,Cuerva, Juan M.,Jiménez, Vicente G.,Márquez, Irene R.,Ma??as, Ermelinda,Mariz, Inês F. A.,Palomino-Ruiz, Lucía
, p. 7139 - 7145 (2020)
A new family of distorted ribbon-shaped nanographenes was designed, synthesized, and their optical and electrochemical properties were evaluated, pointing out an unprecedented correlation between their structural characteristics and the two-photon absorption (TPA) responses and electrochemical band gaps. Three nanographene ribbons have been prepared: a seven-membered-ring-containing nanographene presenting a tropone moiety at the edge, its full-carbon analogue, and a purely hexagonal one. We have found that the TPA cross-sections and the electrochemical band gaps of the seven-membered-ring-containing compounds are higher and lower, respectively, than those of the fully hexagonal polycyclic aromatic hydrocarbon (PAH). Interestingly, the inclusion of additional curvature has a positive effect in terms of non-linear optical properties of those ribbons.
Tetraaryl Cyclopentadienones: Experimental and Theoretical Insights into Negative Solvatochromism and Electrochemistry
Meitinger, Nicolas,Mengele, Alexander K.,Witas, Kamil,Kupfer, Stephan,Rau, Sven,Nauroozi, Djawed
, p. 6555 - 6562 (2020/10/02)
The synthesis of a series of tetraaryl cyclopentadienones comprising different substitution patterns is reported. Their photophysical and electrochemical properties are investigated by UV/Vis spectroscopy and cyclic voltammetry as well as by supporting quantum chemical simulations and reveal a distinct effect of substituents on the redox behavior of the molecules as well as the absorption properties of this class of compounds. While electrochemical data display a shift in reduction potential of up to 200 mV between the differently substituted cyclopentadienones, their photophysical investigations in differently polar solvents suggest a negative solvatochromic effect, although protic solvents induce a bathochromic shift. Crystal structure analyses of some derivatives confirm similarity with related cyclopentadienones while providing insight into intermolecular C–H···O and C–H···π interactions in the solid state.
Electronic Communication across Porphyrin Hexabenzocoronene Isomers
Martin, Max M.,Lungerich, Dominik,Haines, Philipp,Hampel, Frank,Jux, Norbert
, p. 8932 - 8937 (2019/05/29)
Single-molecule electronic components (SMECs) are envisioned as next-generation building blocks in quantum circuit systems. However, challenges such as the reproducibility of the electrode attachment to the individual molecules hamper their fundamental in
Hexaphenylphenylene dendronised pyrenylamines for efficient organic light-emitting diodes
Thomas, K.R. Justin,Velusamy,Lin, Jiann T.,Chuen,Tao, Yu-Tai
, p. 4453 - 4459 (2007/10/03)
A series of blue-emitting triarylamines containing pyrene and hexaphenylbenzene dendrons were successfully synthesized by employing the Diels-Alder and palladium catalyzed C-N coupling reactions. They display high glass transition temperatures (>140°C) in
Syntheses of hexabenzocoronene derivatives
Sadhukhan, Subir K.,Viala, Christine,Gourdon, Andre
, p. 1521 - 1525 (2007/10/03)
The syntheses of four hexabenzo[bc,ef,hi,kl,no,qr]coronene (HBC) derivatives have been carried out. Double Knoevenagel condensation of the benzil 5 with the ketone 6 gave the 2,3,4,5-tetrakis(4-tert-butylphenyl)cyclopenta-2,4-dien-1-one (7). Diels-Alder a
