Molecular pentacene

The polarization properties of single-molecule fluorescence excitation spectra have been explored and utilized to detennine botli tlie molecular transition dipole moment orientation and tlie deptli of single pentacene molecules in a /7-teriDhenyl crystal, taking into account tlie rotation of tlie polarization of tlie excitation light by tlie birefringent... 

Much of our knowledge of the frequency dependence of VER rates in polyatomic molecules stems from low-temperature studies of molecular crystals [2] such as pentacene (PTC 221 4) guest molecules in a crystalline naphthalene (N C,., H ) host. In naphthalene, the phonon cut-off frequency is -180 cm [97]. At low temperature,... 

Chang T-C and DIott D D 1989 Vibrational cooling in large molecular systems pentacene in naphthalene J. Chem. Phys. 90 3590-602... 

Figure 1.13. Crystal structure of solution-grown pentacene along (a) the c-axis and (b) the fe-axis. Pl,a = 0.790 nm, b = 0.606 nm, c = 1.601 nm, a = 101.9°, P = 112.6°, y = 85.8°. Crystallographic data from Campbell et al, 1961. See Table 1.10 for comments on the values of the lattice parameters. Crystal structure of p-6P (c) c-planes along their long molecular axis and (d) along the fe-axis. P2i /c, a = 2.624 nm, b = 0.557 nm, c = 0.809 nm, p = 98.17°. Crystallographic data from Baker et al, 1993. Crystal stmcture of o -6T (e) fee-plane and (f) projection along the c-axis. P2ifn,a = 4.471 nm,fe = 0.785 nm,c = 0.603 nm,jS = 90.76°. Crystallographic data from Horowitz et al, 1995.

Fig. 3 Pentacene grown by supersonic molecular beam deposition to form near monolayer p-type FETs with thiolate monolayer modified Au source and drain contacts (a) visualized by atomic force microscopy and with well-behaved (b) /d-Eds and (c) -Eg characteristics...

Saudari SR, Frail PR, Kagan CR (2009) Ambipolar transport in solution-deposited pentacene transistors enhanced by molecular engineering of device contacts. Appl Phys Lett 95 023301... 

Derivatives of the linear polyacenes, naphthalene,46 anthracene,41,90,93 naphthacene,91,92 and pentacene,92 form stable photodimers M2 when irradiated in concentrated Oa-free solution or (exceptionally) in the crystalline state.94,95 Transannular a-bonding of the molecular dimer components results in a folding of the aromatic planes about the bonded atoms and a reduced -electron delocalization reflected in a shift of the absorption spectrum to much higher frequencies.46,92,96... 

Fig. 1.4. Output (a) and transfer (b) characteristics of a typical OTFT. The inset shows the molecular structure of pentacene, which serves as semiconductor in the device.

Fig. 2.4. The often dramatic effects bottom contacts can have on molecular ordering in organic semiconductors like pentacene. A. Schematic diagram of the type of disorder introduced in pentacene s lamellar structure as thin-film growth encounters a step, for example...

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