Results 191 to 200 of about 8,080 (230)
Pentacene Nanorails on Au(110) [PDF]
Langmuir, 2007 We studied the molecular orientation of pentacene monolayer phases on the Au(110) surface by means of near-edge X-ray absorption spectroscopy at the carbon K-shell and scanning tunneling microscopy. The highest coverage phase, displaying a (6 x 8) symmetry, is found to be formed by two types of differently oriented molecules mimicking regular arrays of
Bavdek G +7 more
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Acta Crystallographica Section C Crystal Structure Communications, 2001
Pentacene, C(22)H(14), crystallizes in different morphologies characterized by their d(001)-spacings of 14.1, 14.5, 15.0 and 15.4 A. We have studied the crystal structure of the 14.1 and 14.5 A d-spacing morphologies grown by vapour transport and from solution. We find a close correspondence between the 14.1 A structure reported by Holmes, Kumaraswamy,
Mattheus, C. C. +5 more
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Pentacene, C(22)H(14), crystallizes in different morphologies characterized by their d(001)-spacings of 14.1, 14.5, 15.0 and 15.4 A. We have studied the crystal structure of the 14.1 and 14.5 A d-spacing morphologies grown by vapour transport and from solution. We find a close correspondence between the 14.1 A structure reported by Holmes, Kumaraswamy,
Mattheus, C. C. +5 more
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Stabilizing Pentacene By Cyclopentannulation
Angewandte Chemie International Edition, 2015AbstractA 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 ...
Sambasiva R, Bheemireddy +6 more
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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. +5 more
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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. +5 more
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Ubiquitous Pentacene Monolayer on Metals Deposited onto Pentacene Films
Langmuir, 2007Photoelectron 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
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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 +4 more
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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 +4 more
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Robust, Soluble Pentacene Ethers
Organic Letters, 2004We 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 +3 more
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Pentacene and poly-pentacene as graphene nanoribbons
Solid State Communications, 2014Abstract 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.
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Photoresponse of pentacene‐based transistors
physica status solidi (a), 2014Organic 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 +10 more
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Synthesis, characterization of the pentacene and fabrication of pentacene field-effect transistors
Chinese Physics B, 2008A 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 +7 more
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