Abstract
4-Tert-butylbenzoic acid (TBBA) was modified to achieve a functional molecular bridge (TBBA-APMS) with double reactivity by the amidation reaction by a cross-linking molecule (3-aminopropyl)trimethoxysilane (abbreviated as APMS). The modified functional ligand further behaves as a bridge which can both coordinate to terbium ion through amide' oxygen atom and occur an in situ sol-gel process with matrix precursor (tetraethoxysilane, TEOS), resulting a novel molecular hybrid material (named as Tb-TBBA-APMS) with double chemical bond (Tb–O coordination bond and Si–O covalent bond). Ultraviolet absorption, phosphorescence, and fluorescence spectra were applied to characterize the photophysical properties of the obtained hybrid material. The strong luminescence of Tb 3+ substantiates optimum energy couple and effective intramolecular energy transfer between the triplet state energy of modified ligand bridge and emissive energy level of Tb 3+.
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