ICCAS OpenIR
Photoinduced electron-transfer processes of tetrathiafulvalene-(spacer)-(naphthalenediimide)-(spacer)-tertrathiafulvalene triads in solution
Guo, XF; Gan, ZH; Luo, HX; Araki, Y; Zhang, DQ; Zhu, DB; Ito, O
2003-11-20
Source PublicationJOURNAL OF PHYSICAL CHEMISTRY A
ISSN1089-5639
Volume107Issue:46Pages:9747-9753
AbstractIntramolecular photoinduced charge-separation and charge-recombination processes of tetrathiafulvalene-(spacer)-naphthalenediimide-(spacer)-tertrathiafulvalenetriads (TTF-(sp)-NIm-(sp)-TTF), which have been designed to change the length and kind of the spacers, have been investigated in various solvents by time-resolved absorption and fluorescence techniques. The fluorescence lifetimes of the NIm moiety considerably decreased compared with that of the NIm molecule, suggesting the photoinduced intramolecular charge-separation via the singlet excited state of the NIm moiety. From the observed short fluorescence lifetimes, the charge-separation rate constants (k(CS)) and quantum yields (Phi(CS)) of TTF-(sp)-NIm-(sp)-TTF have been evaluated; the k(CS) values for the triads with the rigid cyclohexyl spacers are larger than that with long flexible alkyl chain spacers. In the nanosecond transient spectra in PhCN, the absorption bands were observed at 480 and 760 nm, which were attributed to the radical anion of NIm (NIm(.-)) suggesting the formation of TTF.+-(sp)-NIm(.-)(sp)-TTF. From the decays of the radical ion-pair, the charge-recombination rate-constants (k(CR)) were evaluated in the range of 9 x 10(5) - 3 x 10(7) s(-1). Longer lifetimes of the radical ion-pair were observed for the triads with the cyclohexyl spacer than that of the long flexible spacer. From the temperature dependence of the k(CR) values, the reorganization energies and coupling constants were experimentally evaluated in PhCN; small coupling constants of the triads with the cyclohexyl spacers than that of the long flexible spacers support the relatively long lifetimes of the charge separated states of the cyclohexyl spacer.
DOI10.1021/jp0362638
Indexed BySCI
Language英语
WOS IDWOS:000186574600003
PublisherAMER CHEMICAL SOC
Citation statistics
Cited Times:39[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Identifierhttp://ir.iccas.ac.cn/handle/121111/79826
Collection中国科学院化学研究所
Corresponding AuthorZhang, DQ
Affiliation1.Chinese Acad Sci, Inst Chem, Ctr Mol Sci, Beijing 100080, Peoples R China
2.Tohoku Univ, CREST, Inst Multidisciplinary Res Adv Mat, JST,Aoba Ku, Sendai, Miyagi 9808577, Japan
Recommended Citation
GB/T 7714
Guo, XF,Gan, ZH,Luo, HX,et al. Photoinduced electron-transfer processes of tetrathiafulvalene-(spacer)-(naphthalenediimide)-(spacer)-tertrathiafulvalene triads in solution[J]. JOURNAL OF PHYSICAL CHEMISTRY A,2003,107(46):9747-9753.
APA Guo, XF.,Gan, ZH.,Luo, HX.,Araki, Y.,Zhang, DQ.,...&Ito, O.(2003).Photoinduced electron-transfer processes of tetrathiafulvalene-(spacer)-(naphthalenediimide)-(spacer)-tertrathiafulvalene triads in solution.JOURNAL OF PHYSICAL CHEMISTRY A,107(46),9747-9753.
MLA Guo, XF,et al."Photoinduced electron-transfer processes of tetrathiafulvalene-(spacer)-(naphthalenediimide)-(spacer)-tertrathiafulvalene triads in solution".JOURNAL OF PHYSICAL CHEMISTRY A 107.46(2003):9747-9753.
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