Poly octylthiophene

Scheme 5.3 Carbodithioate-functionalized poly(octylthiophene) (left) and its hybrid with 3 nm CdSe nanocrystals (middle). Idealized double-cable structure allowing for efficient electron (e ) and hole (h+) transport (right).112 (Reprinted with permission from C. Querner et al., Chem. Mater. 2006,18, 4817-4826. Copyright 2006 American Chemical Society.)...

Aasmundtveit, K.E. et al.. Orientation effect in thin layers of poly(octylthiophene) on glass studied by synchrotron x-ray diffraction, Synth. Met. 89, 203-208, 1997. 

Figure 8. Raman spectra for various polyconjugated systems in the spectral range of the bond alternation mode carbyne (CA), poly(acetylene) (PA), poly-(octylthiophene) (POT), poly(iso-thianaphtene) (PITN), highly oriented pyrolytic graphite (HOPG), and Ceo (BF).

J. Bras and B. Pepin-Donat. H and C NMR study of regioregular head-to-tail oligo(octylthiophene)s and poly(octylthiophene). Magn. Reson. Chem. 39(2), 57-67 (2001). 

E. J. Samuelsen, J. Mardalen, O. R. Konestabo, M. Hanfland and M. Lorenzen. Poly(octylthiophene) polymorphs under high pressure synchrotron X-rays studies and the relation with spectral behavior. Synth. Met. 101(1-3), 98-99 (1999). 

Glassy carbon covered with poly(octylthiophene) was used to obtain PVC membrane-based all-solid-state reference electrodes. The reference membrane... 

Fig 22 Infrared spectra in the CH2 rocking range of poly-octylthiophene at T= 180°C (A) and at room temperature (B) compared with the spectra of pheny< loctane in solid (T=-178 C) (C) and liquid (D) phase (from ref. 154). 

More recent work has introduced aU solid state configurations to avoid the need for optimizing the iimer solution for each desired sample composition. So far, the lowest detectimi limits have been achieved with ion-selective membranes containing a poly(octylthiophene) layer between the membrane and contacting... 

The evolution of the XPS C(ls), S(2p), and Al(2p) core level lines, upon A1 deposition onto poly(3-octylthiophene) films (P30T), is shown in Figure 5-15 [84. The S(2p) spectrum for the pristine polymer consists of two components, S(2p 1/2) and S(2p.v2), due to spin-orbit coupling. 

Deen, M. Kazemeini, M. 2005. Photosensitive polymer thin-film FETs based on poly(3-octylthiophene). Proc. IEEE 93 1312-1320. 

D Braun, G Gustafsson, D McBranch, and AJ Heeger, Electroluminescence and electrical transport in poly(3-octylthiophene) diodes, J. Appl. Phys., 70 564—568, 1992. 

B. Kraabel, D. Moses, and A.J. Heeger, Direct observation of the intersystem crossing in poly(3-octylthiophene), J. Chem. Phys., 103 5102-5108, 1995. 

S. Guillerez and G. Bidan, New convenient synthesis of highly regioregular poly(3-octylthiophene) based on the Suzuki coupling reaction, Synth. Met., 93 123-126, 1998. 

The QD-MWNT hybrid structures were formed via the assembly of quantum dot (QD) on the surface of MWNTs in aqueous solution (Jares-Erijman and Jovin, 2003), which shows an excellent solubility in aqueous solution, and owns potential application in bioassay, bio-conjugation, and biosensors as well as solar cell. For example, incorporation of QDs and SWNTs into the poly(3-octylthiophene)-(P3OT)... 

Polypyrrole was the first conducting polymer used as ion-to-electron transducer in solid-state ISEs [43], and is still one of the most frequently used [45-68]. Other conducting polymers that have been applied as ion-to-electron transducers in solid-state ISEs include poly(l-hexyl-3,4-dimethylpyrrole) [69,70], poly(3-octylthiophene) [44,70-74], poly(3,4-ethylenedioxythiophene) [75-86], poly(3-methylthiophene) [87], polyaniline [44,67,73,88-99], polyindole [100,101], poly(a-naphthylamine) [102], poly(o-anisidine) [67] and poly(o-aminophenol) [103], The monomer structures are shown in Fig. 4.1. 

Solid-state ISEs with conducting polymers are also promising for low-concentration measurements [60,63,74], even below nanomolar concentrations [60,74], which gives rise to optimism concerning future applications of such electrodes. In principle, the detection limit can be improved by reducing the flux of primary ions from the ion-selective membrane (or conducting polymer) to the sample solution, e.g., via com-plexation of primary ions in the solid-contact material. For example, a solid-state Pb2+-ISEs with poly(3-octylthiophene) as ion-to-electron transducer coated with an ion-selective membrane based on poly(methyl methacrylate)/poly(decyl methacrylate) was found to show detection limits in the subnanomolar range and a faster response at low concentrations than the liquid-contact ISE [74]. 

Whereas in solution the photoluminescence efficiency (Of) of poly(3-alkylthiophenes) (PATs) is 3(Mf)%, it drastically drops to 1-4% and lower in the solid state due to the increased contribution of nonradiative decay via interchain interactions and ISC caused by the heavy-atom effect of sulfur (97MM4608). Optoelectronic devices of this type of compounds have been studied (98SCI(280)1741 06SM(156)1241). Fibers of poly(3-hex-ylthiophene) for photovoltaic applications have been described (07MI1377). Poly(3-octylthiophene) showed a TTA band at 800 nm (96JPC15309). The photophysical properties of some alkyl and aryl polythiophenes have been studied (03JCP(118)1550). The absorption maximum of poly(3-octylthiophene) is at 438 nm, while the fluorescence was... 

The conjugation length of poly(3-alkylthiophene)s can be determined from the absorption maximum in the electronic spectrum. Whereas regioregular (i.e., head-tail) poy(3-octylthiophene) (POT) displays a maximum at 442 nm in CHCl3/Freon-113 solution, the absorbance maximum of 504 is blue shifted by 114 to 328 nm. This blue shift could arise from a particularly low molecular weight. 

Photophysical and electron transfer properties have been studied also in poly(3-octylthiophene) linked to Ru(II) and Os(II)-bypyridine (00IC5496). 

---