Results 141 to 150 of about 2,238 (190)

Pentacene‐Fused Diporphyrins

Chemistry – A European Journal, 2014
AbstractIn this work, we report the synthesis, spectroscopic characterization, and theoretical analysis of a linearly conjugated pentacene‐fused porphyrin dimer and cross‐conjugated quinone‐fused dinaphtho[2,3]porphyrins. These multichromophoric systems display non‐typical UV‐visible absorptions of either porphyrins or pentacenes/quinones.
Lin, Jiang, James T, Engle, Ross A, Zaenglein, Alex, Matus, Christopher J, Ziegler, Hong, Wang, Martin J, Stillman   +6 more
openaire   +2 more sources

Stabilizing Pentacene By Cyclopentannulation

Angewandte Chemie International Edition, 2015
AbstractA new class of stabilized pentacene derivatives with externally fused five‐membered rings are prepared by means of a key palladium‐catalyzed cyclopentannulation step. The target compounds are synthesized by chemical manipulation of a partially saturated 6,13‐dibromopentacene precursor that can be fully aromatized in a final step through a DDQ ...
Bheemireddy SR, Ubaldo PC, Rose PW, Finke AD, Zhuang J, Wang L, Plunkett KN   +6 more
openaire   +3 more sources

PENTACENE AT HIGH PRESSURE

High Pressure Research, 2003
We report a high-pressure optical study of pentacene by Raman, absorption, and reflectance spectroscopy. Two modifications, denoted C and H, were used as starting material. Raman spectra indicate a sluggish phase transition of the polymorph C to the H-phase with a very low onset pressure of 0.2 GPa. The H-phase remains stable up to at least 11 GPa. The
Farina, L., Syassen, K., Brillante, A., Della Valle, R., Venuti, E., Karl, N.   +5 more
openaire   +2 more sources

Ubiquitous Pentacene Monolayer on Metals Deposited onto Pentacene Films

Langmuir, 2007
Photoelectron spectroscopy (XPS and UPS) was used to study the deposition of metal layers (Ag, Cu, and Au) onto pentacene films. Very low work functions were measured (PhiAg = 3.91 eV, PhiCu = 3.93 eV, and PhiAu = 4.3 eV) for all of the metals, in agreement with results from the literature.
B, Jaeckel, J B, Sambur, B A, Parkinson
openaire   +2 more sources

Pentacene and poly-pentacene as graphene nanoribbons

Solid State Communications, 2014
Abstract The development of electronic devices based on the unique electronic properties of graphene requires the large scale synthesis of graphene nanoribbons which remains a significant challenge. A possible way around this is to seek existing molecules that can be readily chemically synthesized and have the structure of graphene nano-ribbons.
openaire   +1 more source

Double Homologation Method for Substituted Soluble Pentacenes and Dimerization Behaviours of Pentacenes

Chemistry – An Asian Journal, 2009
AbstractDouble up: A zirconium‐mediated double homologation method was successfully applied for the synthesis of multi‐substituted pentacene derivatives from 1,2,4,5‐tetrakis(propargyl)benzenes. The bis(zirconacyclopentadiene) intermediates were also characterized.
Shi, Li, Zhiping, Li, Kiyohiko, Nakajima, Ken-ichiro, Kanno, Tamotsu, Takahashi   +4 more
openaire   +2 more sources

Robust, Soluble Pentacene Ethers

Organic Letters, 2004
We report the synthesis and characterization of a series of alkoxy-substituted silylethynylated pentacene derivatives (R = CH(2)CH(2), CHCH, CH(2)). All three compounds are easily prepared, soluble in common organic solvents, and stable both as solids and in solution.
Marcia M, Payne, Jared H, Delcamp, Sean R, Parkin, John E, Anthony   +3 more
openaire   +2 more sources

Photoresponse of pentacene‐based transistors

physica status solidi (a), 2014
Organic thin film phototransistor (OPTs) devices in bottom‐gate/top‐contact configuration were fabricated and used as analytic system to study the electrical and optical properties of pentacene. The channel of the OTFT devices was illuminated by laser radiation of wavelength 670 nm and the effect of irradiation on the electrical responses of the ...
Loffredo Fausta, Bruno Annalisa, Del Mauro Anna De Girolamo, Grimaldi Immacolata Angelica, Miscioscia Riccardo, Nenna Giuseppe, Pandolfi Giuseppe, Petrosino Mario, Villani Fulvia, Minarini Carla, Facchetti Antonio   +10 more
openaire   +3 more sources

Synthesis, characterization of the pentacene and fabrication of pentacene field-effect transistors

Chinese Physics B, 2008
A comprehensive understanding of the organic semiconductor material pentacene is meaningful for organic field-effect transistors (OFETs). Thin films of pentacene are the most mobile molecular films known to date. This paper reported that the pentacene sample was successfully synthesized. The purity of pentacene is up to 95%.
Tao Chun-Lan, Zhang Xu-Hui, Dong Mao-Jun, Liu Yi-Yang, Sun Shuo, Ou Gu-Ping, Zhang Fu-Jia, Zhang Hao-Li   +7 more
openaire   +1 more source

Energy level diagrams of C60/pentacene/Au and pentacene/C60/Au

Synthetic Metals, 2006
Abstract The electronic structures of pentacene and C60 interfaces were investigated using ultraviolet photoelectron spectroscopy (UPS) and X-ray photoelectron spectroscopy (XPS). The magnitudes of measured interface dipole were 0.11 eV and 0.07 eV for the C60 deposited on pentacene (C60/pentacene) and the pentacene deposited on C60 (pentacene/C60 ...
Yeonjin Yi, C Y Kim, C N Whang
exaly   +2 more sources