Wang Fang-Fang, Yan Bing
Department of Chemistry, Tongji University, Siping Road 1239, Shanghai 200092, China.
J Fluoresc. 2007 Jul;17(4):418-26. doi: 10.1007/s10895-007-0184-2. Epub 2007 Apr 18.
In this paper, 2-chlorobenzoic acid (CBA) and 2-chloronicotinic acid (CNA) were modified by 3-aminopropyl-trimethoxysilane (APMS) to afford corresponding organic-inorganic monomers (CBA-APMS and CNA-APMS) with two components equipped with covalent bonds which not only can coordinate to RE ions (Tb(3+) and Gd(3+)) but also act as a sol-gel precursor. Luminescent hybrid materials consisting of terbium-gadolinium complex covalently bonded to silica-based network have been obtained in situ via a sol-gel approach. Through co-hydrolysis and polycondensation, Tb(3+) and Gd(3+) can be introduced in the same organic-inorganic hybrid monomer and then formed Si-O backbones. The co-luminescence effect can be found by studying the luminescence spectra of different ratios of Tb(3+)-Gd(3+), which means that the existence of Gd(3+) can enhance the luminescence intensity, which may be due to the intramolecular energy transfer between Gd(3+) and Tb(3+).
在本文中，2-氯苯甲酸（CBA）和2-氯烟酸（CNA）用3-氨丙基三甲氧基硅烷（APMS）进行改性，以得到相应的有机-无机单体（CBA-APMS和CNA-APMS），其具有两个通过共价键连接的组分，这两个组分不仅可以与稀土离子（Tb(3+)和Gd(3+)）配位，还可作为溶胶-凝胶前驱体。通过溶胶-凝胶法原位制备了由共价键合到硅基网络上的铽-钆配合物组成的发光杂化材料。通过共水解和缩聚反应，Tb(3+)和Gd(3+)可以引入到同一有机-无机杂化单体中，然后形成Si-O主链。通过研究不同比例的Tb(3+)-Gd(3+)的发光光谱，可以发现共发光效应，这意味着Gd(3+)的存在可以增强发光强度，这可能是由于Gd(3+)和Tb(3+)之间的分子内能量转移。
