Local coordination of Eu(III) in organic/inorganic amine functionalized hybrids


The sol-gel method was used to prepare two families of organic/inorganic hybrids incorporating europium triflate, classed as di-urethanesils and aminosils. A siliceous network to which short polyether chains are covalently bonded through urethane linkages, composes the di-urethanesil host. A siliceous network containing pendant amine terminated propyl chains, forms the aminosils. The xerogels were investigated by photoluminescence, particularly the local interaction between the Eu3+ ions and the host matrix. The Eu3+ local coordination was modelled in terms of a local-field perturbation representing the ion's nearest ligands interaction potential. While for the aminosils the Eu3+ ions occupy one low-symmetry local site-crystal-field strength of ca. 760.5 cm(-1) and D-5(0) lifetime of 0.6-0.7 ms-two local Eu3+ environments with distinct point symmetry group, 5130 lifetimes (ca. 0.2-0.3 and 1.4-1.8 ms, respectively) and covalent nature-crystal-field strengths of ca. 540 and 740-780 cm(-1), respectively-were identified in the di-urethanesils. (C) 2003 Elsevier B.V. All rights reserved.



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Chemistry; Materials Science; Metallurgy & Metallurgical Engineering


Carlos, LD; Ferreira, RAS; Goncalves, MC; Bermudez, VD

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