4-MAA与2-NSA共插层镁铝水滑石的制备和光物理性质  

Preparation and Photophysical Properties of Materials Obtained by Co-intercalation of 4-MAA and 2-NSA into Mg-Al-LDH

作　　者：李蕾[1] 朱凯[1] 张立[1] 陈大舟[2] 

机构地区：[1]北京化工大学化工资源有效利用国家重点实验室,北京100029 [2]中国计量科学研究院化学计量与分析科学研究所,北京100013

出　　处：《无机材料学报》2012年第2期122-128,共7页Journal of Inorganic Materials

基　　金：国家自然科学基金(20773010)~~

摘　　要：在乙二醇介质中,通过离子交换法,成功地将一对具有给体受体性质的发色团4-甲氧基苯乙酸(4-MAA)与2-萘磺酸(2-NSA)共插入到层状镁铝水滑石层间,组装得到晶相单一的共插层类水滑石.产物采用XRD、FTIR、TG-DTA等测试技术进行结构表征,采用UV-Vis吸收光谱和荧光光谱研究其光谱特性.并用G03w软件包中abinitio分子轨道法(HF/6-31G)计算了客体分子结构和电荷分布,认为4-MAA阴离子是以单层形式以45°倾斜排布在层板之间,而2-NSA是以单层形式垂直排布层板之间.结果表明,给体受体进入层间后,不仅客体与主体层板存在静电力和氢键相互作用,而且在限域空间内客体之间发生了相互作用,产生了给体受体间的能量转移过程.A pair of chromophores with donor-acceptor properties,4-methoxyphenylacetic acid（4-MAA） and 2-naphthalene sulfonic acid（2-NSA）,were intercalated into the layered double hydroxide（LDH）,[Mg0.66Al0.34（OH）2]（CO3）0.17.0.67H2O by the method of ion-exchange procedures in ethylene glycol.The obtained co-intercalation compounds were characterized by X-ray diffraction,infrared and thermogravimetry techniques.The photochemical properties of the obtained compounds were studied by UV-Vis absorption and fluorescence spectroscopy.The guest molecular sizes and structures were investigated utilizing an ab initio（HF/6-31G） method by G03w.It was believed that the molecular axis of the interlayer 4-MAA molecule was tilted approximately 45°to the layers,and the molecular axis of the interlayer 2-NSA molecule was perpendicular to the plane of the host layer.Both of them were arranged in monolayer between the metal hydroxide layers.These results indicate that the confinement of the pair of chromophores,4-MAA-2-NSA,within the interlayer region of hydrotalcites are in favor of guest-host interaction and guest-guest interaction,and that the pair of chromophores,4-MAA-2-NSA can give rise to energy transfer processes because of the characteristics of their excited states.

关 键 词：水滑石 共插层 给体受体 能量转移 

分 类 号：O641[理学—物理化学]