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Titolo:
Triplet state properties of malonic acid C-60 derivatives C-60[C(COOR)(2)](n); R = H, Et; n=1-6
Autore:
Bensasson, RV; Berberan-Santos, MN; Brettreich, M; Frederiksen, J; Gottinger, H; Hirsch, A; Land, EJ; Leach, S; McGarvey, DJ; Schonberger, H; Schroder, C;
Indirizzi:
Univ Keele, Lennard Jones Lab, Sch Chem & Phys, Keele ST5 5BG, Staffs, England Univ Keele Keele Staffs England ST5 5BG s, Keele ST5 5BG, Staffs, England Museum Natl Hist Nat, Biophys Lab, CNRS, UMR 8646,INSERM,U201, F-75231 Paris 05, France Museum Natl Hist Nat Paris France 05 SERM,U201, F-75231 Paris 05, France Dept Tecnol & Ind Quim, INETI, IBQT A, P-1649038 Lisbon, Portugal Dept Tecnol & Ind Quim Lisbon Portugal P-1649038 649038 Lisbon, Portugal Univ Erlangen Nurnberg, Inst Organ Chem, D-91054 Erlangen, Germany Univ Erlangen Nurnberg Erlangen Germany D-91054 -91054 Erlangen, Germany Christie Hosp NHS Trust, Paterson Inst Canc Res, CRC, Drug Dev Grp, Manchester M20 4BX, Lancs, England Christie Hosp NHS Trust Manchester Lancs England M20 4BX , Lancs, England Observ Paris, DAMAP, CNRS, UMR 8588, F-92195 Meudon, France Observ Paris Meudon France F-92195 NRS, UMR 8588, F-92195 Meudon, France
Titolo Testata:
PHYSICAL CHEMISTRY CHEMICAL PHYSICS
fascicolo: 21, volume: 3, anno: 2001,
pagine: 4679 - 4683
SICI:
1463-9076(2001)3:21<4679:TSPOMA>2.0.ZU;2-B
Fonte:
ISI
Lingua:
ENG
Soggetto:
FUNCTIONALIZED FULLERENE DERIVATIVES; LASER FLASH-PHOTOLYSIS; QUANTUM YIELDS; PHOTOPHYSICAL PROPERTIES; ELECTRON-TRANSPORT; PULSE-RADIOLYSIS; WATER; SENSITIZATION; SPECTROSCOPY; SOLVENT;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Physical, Chemical & Earth Sciences
Citazioni:
38
Recensione:
Indirizzi per estratti:
Indirizzo: McGarvey, DJ Univ Keele, Lennard Jones Lab, Sch Chem & Phys, Keele ST5 5BG, Staffs, England Univ Keele Keele Staffs England ST5 5BG 5BG, Staffs, England
Citazione:
R.V. Bensasson et al., "Triplet state properties of malonic acid C-60 derivatives C-60[C(COOR)(2)](n); R = H, Et; n=1-6", PHYS CHEM P, 3(21), 2001, pp. 4679-4683

Abstract

Laser flash photolysis and pulse radiolysis have been used to determine properties of the lowest triplet state of a series of water-soluble malonic acid derivatives of C-60, C-60[C(COOH)(2)](n) with n = 2-6, in water at pH 7.4. Similar studies were carried out on the corresponding ethyl esters, C-60[COOEt)(2)](n) with n = 1-6, in the non-polar solvents, benzene or toluene. The properties include the T-T absorption spectra, the triplet molar absorption coefficients and the quantum yields of formation, Phi (T) and Phi (Delta) of the triplet and of singlet oxygen, respectively. This study shows a general tendency of the lambda (max) of the T-T absorption spectra, and of the Phi (Delta) values to decrease with increasing number of addends. Forregioisomers, the spectroscopic and photophysical parameters are modulatedwith the pattern of addition. The Phi (Delta) quantum yields for the acidsin aqueous solution are systematically lower than those of the ethyl esters in toluene. The lower Phi (Delta) values observed for the acids in aqueous solution, and to a lesser extent for the esters in benzonitrile, can be interpreted as due to the presence of solute clusters in polar solvents.

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Documento generato il 10/04/20 alle ore 02:42:29