Viologen derivative

The coupling of molecular species to surfaces by the silanization technique has been extended by employing bis-trialkoxysilylated monomers. Examples are the viologen derivative and the cobaltocinium complex 8 (Scheme 4... 

Fig. 3. Haptens and multivalent antigens prepared in this syudy. The viologen derivative, 4,4 -bipyridinium, l-(carboxypentyl)-l -methyl-dichloride (1), divalent antigen 2, and trivalent antigen 3. Anti-porphyrin antibodies were elicited for [5-(4-carboxyphenyl)-10,15,20-tris-(4-methylpyridyl)]porphine (3MPylC) or meso-tetrakis(4-carboxyphenyl)porphine (TCPP). meso-Tetrakis(4-methylpyridyl)porphine (TMPyP) was used to investigate the specificity of the antibody dendrimer for porphyrins...

DiCesare N, Pinto MR, Schanze KS, Lakowicz JR (2002) Saccharide detection based on the amplified fluorescence quenching of a water-soluble poly(phenylene ethynylene) by a boronic acid functionalized benzyl viologen derivative. Langmuir 18 7785-7787... 

Molecular modeling calculations were conducted on the methyl viologen derivative 8 and methyl viologen (MVZ+) to generate the dihedral angles for the dicationic (fully oxidized) and monocationic (one-electron reduced) species <2005TL7291>. 

Figure 7. Photoinduced electron transfer in monolayer systems with the cyanine dye CY as donor and the viologen derivative SV as acceptor. Relative fluorescence intensity of the donor monolayer vs. donor density at constant acceptor density. Bars Donor and acceptor at the same interface, density of A, o(A) = 0.01 nm". Circles donor and acceptor at different interfaces, distance 2.3 nm, o(A) = 0.43 nm-. ...

In an extension of the work done on [Os3(CO)io(iPr-AcPy)] (Struct. 2), a derivative was prepared having the ligand MV-AcPy2+, where MV is a methyl viologen derivative. The picosecond time-resolved UV/vis spectra... 

The high conductivity in liquid crystal (1.2 x 10 S cm at 110°C) due to the viologen derivative has been interpreted in terms of the interaction of ionic conduction of the viologen dication, the cation radical, and iodine species [10]. 

P. Crouigneau, O. Enea, and C. Lamy, A comparative electron spin resonance study of adsorbed cation-radicals generated in situ by electrochemical and photochemical reduction of some viologen derivatives, Norn. J. Chim, 10, 539-543 (1986). 

Z. Porat, Y.-M. Tricot, and I. Rubinstein, New multicharged viologen derivatives. Part 2. Unusual electrochemical behaviour in solution, J. Electroanal. Chem. 315, 225-243 (1991). 

This year has seen increased employment for polymer bound reactants. Both sensitiser, usually tris(2,2 -bipyridyl)ruthenium(II), and electron relay, usually a viologen derivative, have been attached to a polymer backbone. 

The stereoselective luminescence quenching of the MLCT excited A- [Ru(bpy)3] was also carried out in water (I = 0.01 mol dm ) with the different chiral viologen derivatives by Tsukahara and collaborators [22]. In chiral viologens, l,r-bis(l-phenylethylcarbamoylmethyl)-4,4 -bipyridinium (OAV ), l,l -bis(l-naphthylethylcarbamoylmethyl)-4,4 -bipyridinium (POAV " ), and 1-(1 -phenylethyl-carbamoy Imethyl)-1 -( 1 -naphthylethylcarbamoylmethyl)-4,4 -bipyridinium (NPOAV " ), the optically active groups, are introduced to the 1,1 -positions through the amido group, as shown in Scheme 6. 

The fact that by suitable design of the system, micelles can be made to serve as a carrier for either the oxidized sensitized or the reduced relay has been exploited recently174,175) to achieve significant charge separation with amphiphilic viologen derivatives. Consider, for example, the case where the derivative N-tetradecyl N-methylviolo-gen is employed as an electron relay. In the oxidized state this compound exhibits a... 

M. Yamana and T. Kawata, Electrochromism of viologen derivatives, Nippon Kagaku Zasshi, 1977, 941 H. Miyata, Y. Sugahara, K. Kuroda and C. Kato, Synthesis of montmorillonite-viologen intercalation compounds and their photochromic behavior, J. Chem. Soc., Faraday Thins. /., 1987, 83, 1851. 

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