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Control of electron transfer in supramolecular systems

Kristine Kilså (Institutionen för fysikalisk kemi) ; A. N. Macpherson ; T. Gillbro ; Jerker Mårtensson (Institutionen för organisk kemi) ; Bo Albinsson (Institutionen för fysikalisk kemi)
Spectrochimica Acta Part a-Molecular and Biomolecular Spectroscopy (1386-1425). Vol. 57 (2001), 11, p. 2213-2227.
[Artikel, refereegranskad vetenskaplig]

The fluorescence quantum yield of zinc porphyrin (ZnP) covalently linked to 9,10-bis(phenylethynyl)anthracene (AB) is strongly dependent upon the solvent properties. The bichromophoric system ZnP-AB exhibits 'normal' zinc porphyrin fluorescence in solvents that cannot coordinate to the central zinc atom. In contrast, if a Lewis base, such as pyridine, is added to a sufficiently polar solvent, the fluorescence is significantly quenched. Picosecond transient absorption measurements, in conjunction with fluorescence quenching and cyclic voltammetric measurements, suggest that the quenching mechanism is intramolecular electron transfer from ZnP to AB. The charge separated state, ZnP.+-AB(.-), has a lifetime of not more than 220 ps before recombining. If a secondary electron acceptor, iron(III) porphyrin (FeP), is covalently connected to the AB unit, a second electron transfer from AB(.-) to FeP occurs and the charge separated state, ZnP.+-AB-FeP.-, has a lifetime of at least 5 ns. This demonstrates that electron transfer might be sensitively tuned (switched on) by specific solvent effects. (C) 2001 Elsevier Science BN. All rights reserved.



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Denna post skapades 2012-09-21.
CPL Pubid: 163744

 

Institutioner (Chalmers)

Institutionen för fysikalisk kemi (1900-2003)
Institutionen för organisk kemi (1900-2003)

Ämnesområden

Nanovetenskap och nanoteknik
Kemi

Chalmers infrastruktur