Oligo-p-phenylenevinylene

S.J. George et al., Helicity induction and amplification in an oligo(p-phenylenevinylene) assembly through hydrogen-bonded chiral acids. Angew. Chem. Int. Ed. 46, 8206-8211 (2007)... 

Gielen, P. C. M. Christianen, A. P. H. J. Schenning, E. W. Meijer, J. C. Maan, Polarized Emission of Individual Self-assembled Oligo(p-phenylenevinylene)-based Nanofibers on a Solid Support, J. Am. Chem. Soc. 2005, 127, 8280-8281. 

Fig. 25 The series of dyads, 29(n), possessing the oligo-p-phenylenevinylene bridge that were used to investigate the switchover from superexchange characteristics to molecular wire behaviour in the photoinduced electron transfer reaction, from the locally excited state of tetracene (TET) donor to the pyromellitimide (PI) acceptor.148 Also, shown are a schematic of the photoinduced charge separation rate versus, donor-acceptor distance (lower left-hand side) and the LUMO energies of TET and the various bridges (lower right-hand side).

Fig.31 Self association of a oligo(p-phenylenevinylenes) and perylenes as well as b olig(p-phenylenevinylenes) via quadruple hydrogen bonds...

A modified oligo(j9-phenylenevinylene) derivative, l,4-bis[4-(4-octylphe-nyl)styrl]-benzene(24a) has been reported[152], showing a field-effect mobility of 0.12 cm V s with an on/off ratio of 10 (Figure 3.1.8). Recently, OTFTs have also been fabricated using thermally evaporated films of two oligo-p-phenylenevinylenes,... 

T. Ashimine, T. Yasuda, M. Saito, H. Nakamura, and T. Tsutsui. Air Stability of p-Channel Organic Field-Effect Transistors Based on Oligo-p-phenylenevinylene Derivatives. Japanese Journal of Applied Physics, 47(3) 1760-1762, 2008. 

Fig. 1.11 a Chemical structure of bis-UPy-terminated oligofluorenes (UPy-OFn-UPy), UPy-terminated oligo(p-phenylenevinylene) (UPy-OPV), and UPy-terminated perylene bismide (UPy-Pery). b Depiction of the energy transfer (ET) concept in the H-bonded oligofluorenes. Reprinted with the permission from Ref. [106]. Copyright 2005 American Chemical Society... 

Mori, T, Watanabe, T, Minagawa, K., and Tanaka, M. (2005) Self-assembly of oligo(p-phenylenevinylene)-biock-poly (ethylene oxide) in polar media and solubilization of an oligo(p-phenylenevinylene) homooligomer inside the assembly. /. Polym. Sci. A, 43, 1569-1578. 

Poly- and oligo-(p-phenylenevinylene) (PPV OPV) as well as their substituted derivatives belong to the conjugated systems with valuable opto-electronical properties [1] as a consequence, the preparation of highly regular PV-products is in the focus of interest of many research groups, worldwide. In this contribution an overview will be given about olefin metathesis as a tool for direct synthesis of PPV, OPV and of their substituted derivatives. Furthermore, results of the product characterization and the product properties will be presented exemplarily. 

Figure 9 Ruorescence titration of a 1 2 equilibria, (a) The structure of the chiral ditopic oligo(p-phenylenevinylene) crown ether (COPY) binding to sodium (Na+). (b) Emission spectra = 453 nm) in chloroform of COPY (4.4 x 10 M ) on addition of NaPFe. (c) The corresponding binding isotherm showing the change in emission at 518 nm as a function of [Na+]/[COPY]. The resulting binding constants are also shown. (Reproduced from Ref. 18. Royal Society of Chemistry, 2007.)...

Scanning tunneling microscopy (STM) measurements of oligo-ureidophthalimide (prepared from oligo(p-phenylenevinylene)s 8 and 9, Figure 5.4) were used to confirm that 6-8 monomers were necessary for one turn (Figure 5.5). ° ... 

Table IX. Absorption Maxima of the Radical Cations and the Dication of Oligo-p-phenylenevinylenes in Solutions ...

This synthesis methodology was expanded to the synthesis of ladder oligo(p-phenylenevinylene)s (LOPVs) and related n-electron systems, having annelated... 

Scheme 5 Synthesis of ladder oligo(p-phenylenevinylene)s tind the longest molecule obteiined by...

Fig. 24 (a) DisUene analogs of the oligo(p-phenylenevinylene)s (Si-OPVs) disUastilbene DSS and tetrasiladistyrylbenzene TSDSB. (b) Highly planar crystal structure of tetrasUadistyrylbenzene and its fluorescence - reproduced with permission of the American Chemical Society from [91]... 

Despite the few reports on silicon analogs of oligo(p-phenylenevinylenes) it appears that this emerging class of organosilicon materials exhibits promising optical properties for future photonic applications. 

Xu C, Wakamiya A, Yamaguchi S (2005) Ladder oligo(p-phenylenevinylene)s with silicon and carbon bridges. J Am Chem Soc 127 1638-1639... 

Yamaguchi S, Xu C, Yamada H, Wakamiya A (2005) Synthesis, structures, and photophysical properties of silicon and carbon-bridged ladder oligo(p-phenylenevinylene)s and related Jt-electron systems. J Organomet Chem 690 5365-5377... 

Recently, Tew et al. [73] reported the synthesis and characterization of triblock rod-coil molecules consisting of diblock coil segments of polystyrene and polyisoprene, and oligo(p-phenylenevinylene) (OPV) trimers as rod segments. On the basis of TEM and X-ray diffraction data, these molecules formed self-organized nanostructures, which in turn assemble into monolayers. The same group has also synthesized dendron rod-coil... 

Fig. 27 Structures of ureidopyrimidinone functionalized oligo(p-phenylenevinylene)s (OPVs)...

Organogels of Oligo(p-phenylenevinylene)s and Related 7r-Conjugated Systems... 

Of interest are also compounds which combine different properties. 42 (Fig. 21) contains two oligo-p-phenylenevin)rlene units sy mmetrically linked to a central perylenediimide core [117]. The oligo-p-phenylenevinylene units and perylenediimides are typical electron donor and electron acceptor moieties, respectively. These molecules are stacked in rows as observed... 

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