Novel soluble pentacene and anthradithiophene derivatives for organic thin-film transistors
摘要:
Four new solution-processable pentacene- (PEN) and anthradithiophene- (ADT) based organic semiconductors bearing two phenylethynyl (PE-) or triethylsilylphenylethynyl (TESPE-) substituents have been synthesized, characterized, and incorporated in thin-film transistors (TFTs). The molecular structures of these four materials have been determined by single-crystal X-ray diffraction. Thin films of all four compounds have been fabricated via drop-casting and exhibited p-channel OTFT transport with hole mobilities as high as similar to 0.01 cm(2)/V s. Compared to PEN derivatives, ADT-based compounds exhibited superior device performance and photooxidative stability in ambient. The film morphologies and microstructures of these compounds have been characterized by optical microscopy and X-ray diffraction to rationalize device performance trends. (C) 2010 Elsevier B.V. All rights reserved.
Novel soluble pentacene and anthradithiophene derivatives for organic thin-film transistors
摘要:
Four new solution-processable pentacene- (PEN) and anthradithiophene- (ADT) based organic semiconductors bearing two phenylethynyl (PE-) or triethylsilylphenylethynyl (TESPE-) substituents have been synthesized, characterized, and incorporated in thin-film transistors (TFTs). The molecular structures of these four materials have been determined by single-crystal X-ray diffraction. Thin films of all four compounds have been fabricated via drop-casting and exhibited p-channel OTFT transport with hole mobilities as high as similar to 0.01 cm(2)/V s. Compared to PEN derivatives, ADT-based compounds exhibited superior device performance and photooxidative stability in ambient. The film morphologies and microstructures of these compounds have been characterized by optical microscopy and X-ray diffraction to rationalize device performance trends. (C) 2010 Elsevier B.V. All rights reserved.
The protection of terminal ethynyl groups in Grignard syntheses
作者:C. Eaborn、A. R. Thompson、D. R. M. Walton
DOI:10.1039/j39670001364
日期:——
The trimethylsilyl group can be used to protect a terminalethynylgroup in Grignardsyntheses. For example, a Grignard reagent can be made in tetrahydrofuran from the easily prepared compound (p-bromophenylethynyl)-trimethylsilane, and carbonation gives the acid (p-carboxyphenylethynyl)trimethylsilane, which on treatment with dilute alkali gives p-ethynylbenzoic acid in 55% overall yield. The corresponding
Synthesis and Properties of F-Containing Poly(diphenylacetylene) Membranes
作者:Toshikazu Sakaguchi、Masashi Shiotsuki、Fumio Sanda、Benny D. Freeman、Toshio Masuda
DOI:10.1021/ma051445g
日期:2005.10.1
The polymerization of various silyl- and F-containing diphenylacetylenes (1a-k) with TaCl5- n-BU4Sn provided high-molecular-weight polymers. Most polymers (2a-d, 2g, and 2h) were totally soluble in common organic solvents and afforded tough free-standing membranes by casting from toluene solution, while some polymers (2e, 2f, and 2i-k) were insoluble in any organic solvents. The onset temperatures of weight loss of polymers 2a-d in air were over 400 *C, indicating very high thermal stability. The membranes of 2a-d were desilylated with trifluoroacetic acid to give desilylated polymer membranes 3a-d, which were insoluble in any solvents. The fractional free volumes (FFV) of the present membrane-forming trimethylsilyl and/or F-bearing polymers (2a-d and 3a-d) were ca. 0.28-0.31 and appreciably large, and they showed very high permeability (ca. 1400-14 000 barrers) to the six gases examined. The oxygen permeability coefficient (P-O2) of 2a was as high as 2900 barrers, which is about twice that of poly[1-(p-trimethylsilyl)phenyl-2-phenylacetylene]. The incorporation of F atoms into both poly[1-(p-trimethylsilyl)phenyl-2-phenylacetylene] and poly(diphenylacetylene) generally enhanced gas permeability.