Transparent luminescent sol-gel films containing europium(III) and terbium(III) cations

The I : II product ratio calculated from the GLC and 1 H NMR data is 84 : 16. The IR spectrum of compound I exhibits absorption bands for stretching (2974, 2933, 2888 cm –1 ) and bending (1441, 1391, 1355, 1295 cm –1 ) C–H vibrations. The intense doublet at 1613 and 1583 cm –1 and the band at 1517 cm –1 refer to imino enol (HOC=CH–C=N) vibrations, while the triethoxysilyl group is responsible for a series of strong absorption bands at 1168, 1097, 961, Transparent Luminescent Sol–Gel Films Containing Europium(III) and Terbium(III) Cations