What is pentacene used for?
Pentacene is a popular choice for research on organic thin-film transistors and OFETs, being one of the most thoroughly investigated conjugated organic molecules with a high application potential due to a hole mobility in OFETs of up to 5.5 cm2/(V·s), which exceeds that of amorphous silicon.
How many condensed benzene ring in pentacene?
five benzene rings
Introduction. Pentacene is a polycyclic aromatic hydrocarbon consisting of five benzene rings fused in a linear fashion (Fig. 1).
Why is pentacene Coloured?
In the presence of air and visible or UV light, pentacene crystals change color from purple to green, the result of photooxidation of the central aromatic ring. Its synthesis was first reported in 1929.
What is TIPS pentacene?
General description. 6,13-Bis(triisopropylsilylethynyl)pentacene (TIPS-pentacene) is a conductive polymer that can form organic thin films for a variety of semiconductor applications due to its high charge carrier mobility and stability.
Is pentacene a semiconductor?
Pentacene is an organic semiconductor used in a variety of thin-film organic electronic devices.
What is molecular transistor?
The term molecular transistors refers to switching circuits constructed from an individual molecule. Today’s semiconductor devices use “top down” bulk techniques involving lithography; however, the potential exists to grow individual devices using chemical processes in a “bottom up” fashion.
Why is azo colored?
Azo compounds are colored due to the presence of double and triple bonds in addition to conjugation.
Which reaction is used in the initial stage of the synthesis of pentacene?
The first synthesis of pentacene was accomplished by Clar in 1929 via a transfer dehydrogenation of 6,13-dihydropentacene using phenanthraquinone [10,11]. Thus, successive Friedel-Craft acylations of m-xylene using benzoyl chloride produces 1,3-dibenzoyl-4,6-dimethylbenzene.
What is molecular rectifier?
The molecular rectifier consists of a donor pi system and an acceptor pi system, separated by a sigma-bonded (methylene) tunnelling bridge. The response of such a molecule to an applied field is calculated, and rectifier properties indeed appear.
How does pH affect azo dyes?
Because many indicator dyes are pH-dependent, absorbance of the azo dye may vary not only because of nitrite concentration differences, but also because of pH variation. Thus, erroneous results could arise from a standard curve developed at one pH and used for a test sample at a different pH.