Novel luminescent terbium molecular-based hybrids with modified meta-aminobenzoic acid covalently bonded with silica
Novel luminescent terbium molecular-based hybrids with modified meta-aminobenzoic acid covalently bonded with silica
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DOI：
10.1039/b402667e
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发表时间：
2004-07
影响因子：
--
通讯作者：
Qianming Wang;B. Yan
中科院分区：
文献类型：
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作者：
Qianming Wang;B. Yan
合成了一种新型的溶胶-凝胶法有机-无机分子杂化材料，两部分通过Tb-O和Si-O键共价连接在一起。用3-(三乙氧基硅基)丙基异氰酸酯修饰间氨基苯甲酸(MAB)的衍生物，得到有机组分，然后应用前驱体与Tb3+的羧基配位，其三乙氧基硅基部分可与正硅酸乙酯(TEOS)发生聚合或交联反应。因此，最终的杂化材料是由两个乙氧基(MAB-Si和TEOS)的水解和缩聚过程组合而成的。用紫外吸收光谱、磷光光谱和荧光光谱研究了杂化材料的光物理性质，结果表明改性间氨基苯甲酸的三重态能量与Tb3+的发射能级相匹配。通过这种方式，这种分子基杂化材料内部发生了能量传递过程，并实现了Tb3+的强绿色发射。
A novel type of sol–gel-derived organic–inorganic molecular-based hybrid material with the two parts covalently linked together via Tb–O and Si–O bonds was synthesized. The organic component was obtained from a derivative of meta-aminobenzoic acid (MAB) which is modified by 3-(triethoxysilyl)-propyl isocyanate, and then the precursor is applied to coordinate to Tb3+ with the carboxyl group and its triethoxysilyl moiety is capable of undergoing polymerization or cross-linking reactions with TEOS (tetraethoxysilane). Accordingly, the final hybrid material is formed by a combination of hydrolysis and polycondensation processes of two ethoxy groups (both MAB-Si and TEOS). Ultraviolet absorption, phosphorescent and fluorescent spectra were used to investigate the photophysical properties of the hybrid material, which reveal that the triplet energy of modified meta-aminobenzoic acid matches with the emissive energy level of Tb3+. In this way, the intramolecular energy transfer process took place within this molecular-based hybrid and a strong green emission of Tb3+ was achieved.