Porphyrins covalently linked

Nevertheless, the inverse region is observed in the particular case where the electron donor and the electron acceptor are held apart by a bridge (e.g. porphyrins covalently linked to quinones). 

Another mode of rigid linking of P and Q has been suggested [152]. In this work porphyrin covalently linked with cyclodextrin, PC, was reported to have... 

Photoinduced intramolecular electron tunneling was observed also in some other porphyrin containing bridge molecules, such as porphyrin covalently linked to phenolphthalein [308], dimethylaniline — mesoporphyrin II — quinone triad [309], Zn porphyrin-viologen-quinone triad [310], carotenoid — porphyrin -diquinone tetrad [311]. The influence of conformational state of porphyrin-viologen bridge molecules on the rate of PET reactions was studied in Ref. [312]. 

The vast majority of the dyad models for photosynthetic electron transfer have consisted of synthetic porphyrins covalently linked to quinones. The first such models were reported in the late 1970 s. Kong and Loach prepared the ester-linked dyad 2 in 1978 [38], and the amide 3 was reported by Tabushi and coworkers in 1979 [39]. A large number of these P-Q systems have now appeared in the literature. The reader is referred to several reviews [13, 34, 40], including the recent review by Connolly and Bolton [41] for a complete compilation of these results. 

A. Ishida Y. Sakata T. Majima, Surface plasmon excitation of a porphyrin covalently linked to a gold surface. J. Chem. Soc., Chem. Comm 1998, 57-58. 

The photochemistry of a molecular triad consisting of a porphyrin covalently linked to a carotenoid polyene and a fullerene derivative has been studied at 20 K by time-resolved EMR spectroscopy following laser excitation (Carbonera et al., 1998). Excitation of the porphyrin yields a coupled radical pair with a carotenoid cation and a C o anion. The exchange interation in the pair has been determined to approx. 

Figure 7. Supramolecular cage-like compound 6 formed through 12 H bonds between two porphyrins covalently linked to 5-alkyluracil recognition groups, and two alkyltriaminopyrimidine units.

A suspension obtained from the water-solnble anionic mew-tetrakis(4-carboxyphenyl)porphyrin and MWCNTs was nsed as an optical probe for DNA detection [242]. The same target was achieved very recently, constructing a supramolecular assembly with the water-soluble anionic 5-(4-aminophenyl)-10,15,20-tris(4-sulfonatophenyl)porphyrin, covalently linked to MWCNTs and complexed with cyclodextrins (CD, either a-CD or P-CD) [243]. 

Orellana W. Catalytic activity toward oxygen reduction of transition metal porphyrins covalently linked to single-walled carbon nanotubes a density functional study. Phys Rev B 2011 84 155405/1-/1155405. 

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