Photophysical Properties of Terbium Molecular‐based Hybrids Assembled with Novel Ureasil Linkages
Photophysical Properties of Terbium Molecular‐based Hybrids Assembled with Novel Ureasil Linkages
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DOI：
10.1111/j.1097.2007.00112
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发表时间：
2007-07
影响因子：
3.3
通讯作者：
B. Yan;Xiaofei Qiao
中科院分区：
文献类型：
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作者：
B. Yan;Xiaofei Qiao
通过溶胶-凝胶法制备了由羟基芳香族衍生物（2-乙酰基苯酚[HAP]、2-羟基-3-甲基苯甲酸[HMBA]、3-羟基-间苯二甲酸[HMPHTH]配合物）组成的三种二氧化硅基有机-无机杂化体系。通过氢转移加成反应接枝3-(三乙氧基硅基)-异氰酸丙酯(TESPIC)的三个配体的活性羟基作为多功能桥组分，可以与羰基配位到Tb3+，强烈吸收紫外光并通过三重激发态有效地将能量转移到Tb3+，并与四乙氧基硅烷(TEOS)发生聚合或交联反应，将铽离子锚定在二氧化硅骨架上。使用核磁共振、傅立叶变换红外光谱、紫外可见吸收光谱、发光光谱来研究所获得的杂化材料。由于有效的配体到金属的能量转移机制，有机成分中的紫外线激发导致 Tb3+ 离子产生强烈的绿光发射。
Three silica‐based organic–inorganic hybrid systems composed of hydroxyl aromatic derivatives (2‐acetylphenol [HAP], 2‐hydroxy‐3‐methylbenzoic acid [HMBA], 3‐hydroxy‐meta‐phthalic acid [HMPHTH] complexes) were prepared via a sol–gel process. The active hydroxyl groups of the three ligands grafted by 3‐(triethoxysilyl)‐propyl isocyanate (TESPIC) through hydrogen transfer addition reaction were used as multi‐functional bridge components, which can coordinate to Tb3+ with carbonyl groups, strongly absorb ultraviolet light and effectively transfer energy to Tb3+ through their triplet excited state, as well as undergo polymerization or crosslinking reactions with tetraethoxysilane (TEOS), for anchoring terbium ions to silica backbone. NMR, FT‐IR, UV–vis absorption, luminescence spectroscopy was used to investigate the obtained hybrid material. UV excitation in the organic component resulted in strong green emission from Tb3+ ions due to an efficient ligand‐to‐metal energy transfer mechanism.