ICCAS OpenIR
Formation of the charge-transfer exciton in 1,3,5-triphenyl-2-pyrazoline nanocrystals
Fu, HB; Xiao, DB; Xie, RM; Ji, XH; Yao, JN
2003
Source PublicationCANADIAN JOURNAL OF CHEMISTRY-REVUE CANADIENNE DE CHIMIE
ISSN0008-4042
Volume81Issue:1Pages:7-13
AbstractA series of 1,3,5-triphenyl-2-pyrazoline (TPP) nanocrystals were prepared by the reprecipitation method. The electronic transitions of TPP nanocrystals have been studied using both absorption and fluorescence spectra. An absorption feature at about 400 nm gradually appeared with increasing nanocrystal size. This feature resulted from the formation of the charge-transfer (CT) exciton in nanocrystals. It was also supported by the longer decay time of the nanocrystal emission from CT compared with that of the solution emission from S-1 at 298 K. On the other hand, the different behavior of the molecular pi-pi* and n-pi* transitions originates from the different overlapping modes of the pyrazoline pi orbital and n-electron orbital, according to the molecular model calculations. The nanocrystal emission from both the S-1 and CT states was found at 77 K; moreover, the emission intensity redistributed from S-1 to CT with increasing nanocrystal size. In contrast, at 298 K, only the emission from the CT states was observed, since the thermal fluctuation easily relaxes the excited electrons into CT states through vibration.
KeywordReprecipitation Method Organic Nanocrystals Charge-transfer Exciton Size-dependent Property
DOI10.1139/V02-193
Indexed BySCI
Language英语
WOS IDWOS:000180803400002
PublisherNATL RESEARCH COUNCIL CANADA
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Document Type期刊论文
Identifierhttp://ir.iccas.ac.cn/handle/121111/81014
Collection中国科学院化学研究所
Corresponding AuthorYao, JN
AffiliationChinese Acad Sci, Inst Chem, Ctr Mol Sci, Beijing 100080, Peoples R China
Recommended Citation
GB/T 7714
Fu, HB,Xiao, DB,Xie, RM,et al. Formation of the charge-transfer exciton in 1,3,5-triphenyl-2-pyrazoline nanocrystals[J]. CANADIAN JOURNAL OF CHEMISTRY-REVUE CANADIENNE DE CHIMIE,2003,81(1):7-13.
APA Fu, HB,Xiao, DB,Xie, RM,Ji, XH,&Yao, JN.(2003).Formation of the charge-transfer exciton in 1,3,5-triphenyl-2-pyrazoline nanocrystals.CANADIAN JOURNAL OF CHEMISTRY-REVUE CANADIENNE DE CHIMIE,81(1),7-13.
MLA Fu, HB,et al."Formation of the charge-transfer exciton in 1,3,5-triphenyl-2-pyrazoline nanocrystals".CANADIAN JOURNAL OF CHEMISTRY-REVUE CANADIENNE DE CHIMIE 81.1(2003):7-13.
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