CAS OpenIR  > 中科院上海应用物理研究所2004-2010年
Effects of ionic liquid [bmim][PF6] on absorption spectra and reaction kinetics of the duroquinone triplet state in acetonitrile
Zhu, G(朱光来); Wu, G(吴国忠); Sha, M(沙茂林); Long, D(龙德武); Yao, S(姚思德); Wu, G (reprint author), Chinese Acad Sci, Shanghai Inst Appl Phys, POB 800204, Shanghai 201800, Peoples R China
2008
Source PublicationJOURNAL OF PHYSICAL CHEMISTRY A
ISSN1089-5639
Volume112Issue:14Pages:3079
AbstractThe transient absorption spectra and photoinduced electron-transfer process of duroquinone (DQ) in mixed binary solutions of ionic liquid (IL) [bmim][PF6] and acetonitrile (MeCN) have been investigated by laser photolysis at an excitation wavelength of 355 nm. A spectral blue shift of (3)DQ* was observed in the IL/MeCN mixtures compared to MeCN. At lower V-IL(volume fraction of IL), the interaction between DQ and the solvent is dominant, and the decay rate constant (k(obs)) of (3)DQ* increases steadily with the increasing of V-IL; to the contrary, at higher V-IL, the network structures due to the hydrogen bond and viscosity are dominant, and the decay rate constant decreases obviously with increasing V-IL. A critical point (turnover) was observed at V-IL = similar to 0.30. The dependence of the observed growth rate (k(gr)) of the photoinduced electron-transfer (PET) products on V-IL is complex and shows a special change; k(gr) first decreases with increasing V-IL, then increases, and finally decreases slowly with further increasing of V-IL. It is speculated that the PET process in the mixture can be affected by factors including the local structure and the reorganization energy of the solvent and salt and cage effects. The change of local structure of [bmim][PF6]/MeCN is supported by following the steady-state fluorescence behavior of the mixture, in combination with the molecular dynamics simulation of the thermodynamic property. The results revealed that the degree of self-aggregation of monomeric cations (bmim(+)) to associated forms increases with increasing V-IL. This is in good agreement with the laser photolysis results for the same solutions.
Subject AreaPhysics
Indexed BySCI
Language英语
Funding Project应物所项目组
WOS IDWOS:000254659700012
Citation statistics
Cited Times:17[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Identifierhttp://ir.sinap.ac.cn/handle/331007/7710
Collection中科院上海应用物理研究所2004-2010年
Corresponding AuthorWu, G (reprint author), Chinese Acad Sci, Shanghai Inst Appl Phys, POB 800204, Shanghai 201800, Peoples R China
Recommended Citation
GB/T 7714
Zhu, G,Wu, G,Sha, M,et al. Effects of ionic liquid [bmim][PF6] on absorption spectra and reaction kinetics of the duroquinone triplet state in acetonitrile[J]. JOURNAL OF PHYSICAL CHEMISTRY A,2008,112(14):3079.
APA Zhu, G,Wu, G,Sha, M,Long, D,Yao, S,&Wu, G .(2008).Effects of ionic liquid [bmim][PF6] on absorption spectra and reaction kinetics of the duroquinone triplet state in acetonitrile.JOURNAL OF PHYSICAL CHEMISTRY A,112(14),3079.
MLA Zhu, G,et al."Effects of ionic liquid [bmim][PF6] on absorption spectra and reaction kinetics of the duroquinone triplet state in acetonitrile".JOURNAL OF PHYSICAL CHEMISTRY A 112.14(2008):3079.
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