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Di-Urethane Cross-linked Poly(oxyethylene)/Siloxane Nanohybrids Doped With Eu(CF3SO3)3

Published online by Cambridge University Press:  01 February 2011

M. C. Gonçalves ,
V. de Zea Bermudez ,
R. A. Sá Ferreira ,
D. Ostrovskii  and
L. D. Carlos
M. C. Gonçalves
Affiliation:
Department of Chemistry and CQ-VR, University of Trás-os-Montes and Alto Douro, 5000–911 Vila Real, Portugal
V. de Zea Bermudez
Affiliation:
Department of Chemistry and CQ-VR, University of Trás-os-Montes and Alto Douro, 5000–911 Vila Real, Portugal
R. A. Sá Ferreira
Affiliation:
Department of Physics and CICECO, University of Aveiro, 3810–193 Aveiro, Portugal
D. Ostrovskii
Affiliation:
Department of Applied Physics, Chalmers University of Technology, 41296 Göteborg, Sweden
L. D. Carlos
Affiliation:
Department of Physics and CICECO, University of Aveiro, 3810–193 Aveiro, Portugal
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Abstract

Attractive sol-gel derived di-urethane cross-linked poly(oxyethylene), POE/siloxane hybrids (di-urethanesils) doped with europium triflate, Eu(CF3SO3)3 were examined by Fourier Transform mid-infrared (FT-IR), Raman (FT-Raman) and Photoluminescence spectroscopies with the main goal of elucidating the chemical environment of the cations in these materials. In these hybrids the POE chains contain about 13 oxyethylene repeat units. Samples with compositions ∞ > n ≥ 5 (where n indicates the ratio of (OCH2CH2) moieties per Eu3+ion) were investigated. The FT-IR and FT-Raman data obtained provided unequivocal evidence that the ether oxygen atoms of the polymer chains start to interact with the Eu3+ ions at n = 20. The presence of a crystalline POE/Eu(CF3SO3)3 complex was detected at n ≥ 20. Photoluminescence results demonstrated that the doped di-urethanesils studied here are room temperature (RT) efficient full-color emitters. Two distinct cation local sites were unequivocally identified at n = 200 and 20. These Eu3+ local coordination sites involve the oxygen atoms of the urethane carbonyl groups and weakly coordinated Eu3+/CF3SO3 ionic species. For the most concentrated hybrid (n=5) evidences of a third local-environment probably involving the oxygen atoms of the polymer chains was observed.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 847: Symposium EE – Organic/Inorganic Hybrid Materials , 2004 , EE13.1
Copyright
Copyright © Materials Research Society 2005

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References

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