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Preparation, structure and photochromic properties of dilong-chain alkyl group Dawson type molybdophosphoric acid multicomposite films
Zhang, TR; Feng, W; Lu, R; Bao, CY; Zhao, YY; Li, TJ; Yao, JN
2002-02-01
Source PublicationCHEMICAL JOURNAL OF CHINESE UNIVERSITIES-CHINESE
ISSN0251-0790
Volume23Issue:2Pages:297-299
AbstractA multicomposite P2Mo18/DODA self-assembled multilayer film was fabricated by casting the chloroform solutions of ionic complex between a dimethyldidecylammomium and a phosphomolybdate anion onto the borosilicate glass and calcium fluoride substrates. Infrared spectra revealed that the Dawson strcucture characteristic of the P2Mo18O625- anion was presented in the composite film. A well-ordered superlattice structure, d-spacing 3.59 nm, was identified by X-ray diffraction. The composite film shows good photochromic properties. Under the irradiation with UV fight, the transparent film changed from yellow to blue. Then, bleaching occurred when the film was in contact with ambient air or O-2 in the dark. If the UV irradiated films were stored in nitrogen, helium, argon or vacuum conditions, it could retain blue coloration for a long time. It suggests that oxygen plays an important role during the bleaching process. The photochromic mechanism of the composite film was studied by UV-Vis spectra, FTIR spectra and ESR. The appearance of IVCT bands shows that electron transfer occurs between the organic substrate and heteropolyanion, converting heteropolyanions to heteropolyblues with simultaneous oxidation of the organic substrate. Observation of UV-induced ESR signal suggests that electron transfer takes place in the lattice and P2Mo18O626- acting as an acceptor gets electrons during UV irradiation. The changes of IR spectra for the composite film after UV irradiation are another powerful proof to identify the DODA was oxidized and P2Mo18O626- was reduced in the photochronic process.
Keyword18-molybdophosphoric Acid Dimethyldioctadecylamine Photochromism Charge-transfer
Indexed BySCI
Language英语
WOS IDWOS:000174163300034
PublisherHIGHER EDUCATION PRESS
Citation statistics
Cited Times:8[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Identifierhttp://ir.iccas.ac.cn/handle/121111/79576
Collection中国科学院化学研究所
Corresponding AuthorLu, R
Affiliation1.Jilin Univ, Coll Chem, Changchun 130023, Peoples R China
2.Chinese Acad Sci, Inst Chem, Ctr Mol Sci, Beijing 100080, Peoples R China
Recommended Citation
GB/T 7714
Zhang, TR,Feng, W,Lu, R,et al. Preparation, structure and photochromic properties of dilong-chain alkyl group Dawson type molybdophosphoric acid multicomposite films[J]. CHEMICAL JOURNAL OF CHINESE UNIVERSITIES-CHINESE,2002,23(2):297-299.
APA Zhang, TR.,Feng, W.,Lu, R.,Bao, CY.,Zhao, YY.,...&Yao, JN.(2002).Preparation, structure and photochromic properties of dilong-chain alkyl group Dawson type molybdophosphoric acid multicomposite films.CHEMICAL JOURNAL OF CHINESE UNIVERSITIES-CHINESE,23(2),297-299.
MLA Zhang, TR,et al."Preparation, structure and photochromic properties of dilong-chain alkyl group Dawson type molybdophosphoric acid multicomposite films".CHEMICAL JOURNAL OF CHINESE UNIVERSITIES-CHINESE 23.2(2002):297-299.
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