NDLI: Fabrication and optical nonlinearities of composite films derived from the water-soluble Keplerate-type polyoxometalate and chloroform-soluble porphyrin

Content Provider	World Health Organization (WHO)-Global Index Medicus
Author	Yang, Di Li, Jiaqi Ren, Haizhou Shi, Zonghai Zhang, Lijuan Shehzad, Farooq Khurum Mu, Cuncun Zhou, Yunshan
Description	Author Affiliation: Shi Z ( State Key Laboratory of Chemical Resource Engineering, Institute of Science, Beijing University of Chemical Technology, Beijing 100029, P. R. China. zhouys@mail.buct.edu.cn ljzhang@mail.buct.edu.cn.)
Abstract	Composite films derived from the water-soluble Keplerate-type polyoxometalate $(NH_{4})_{42}[Mo_{132}O_{372}(CH_{3}COO)_{30}(H_{2}O)_{72}]·ca.$ $300H_{2}O·ca.$ $10CH_{3}COONH_{4}$ (denoted $(NH_{4})_{42}\{Mo_{132}\})$ and chloroform-soluble tetraphenylporphyrin perchlorate $[H_{2}TPP](ClO_{4})_{2}$ are successfully fabricated by a layer-by-layer self-assembly method and characterized by UV-vis spectroscopy and X-ray photoelectron spectroscopy (XPS). The structure of the $\{Mo_{132}\}$ and $[H_{2}TPP]^{2+}$ in the films remain intact in light of the results of UV-vis spectroscopy and XPS. UV-vis spectra measurements reveal that the amounts of deposition of $\{Mo_{132}\}$ and $[H_{2}TPP]^{2+}$ remain constant in every adsorption cycle in the composite films assembly process. Nonlinear optical properties of the composite films have been investigated by using the Z-scan technique at a wavelength of 532 nm and pulse width of 7 ns. The results show that the composite films have notable nonlinear saturated absorption and self-defocusing effects. The combination of $\{Mo_{132}\}$ with $[H_{2}TPP]^{2+}$ can result in composite films with remarkably enhanced optical nonlinearities. The interfacial charge transfer induced by laser from porphyrin to POM in the films is thought to play a key role in the enhancement of NLO response. The third-order NLO susceptibility $χ^{(3)}$ of the composite films increases with the increase of film thickness.
ISSN	14779226
Issue Number	9
Journal	Dalton Trans.
Volume Number	44
e-ISSN	13645447
Language	English
Publisher	Royal Society of Chemistry
Publisher Date	2015-03-07
Publisher Place	Great Britain (UK)
Access Restriction	Subscribed
Subject Keyword	Chemistry
Content Type	Text
Resource Type	Article
Subject	Inorganic Chemistry

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