两种三维无机-有机杂化材料的溶剂热法合成及反射光谱研究  

Solvothermal synthesis and diffuse reflectance spectra of two inorganic-organic hybrid compounds

作　　者：李增和[1] 白海丹[1] 

机构地区：[1]北京化工大学理学院,北京100029

出　　处：《北京化工大学学报（自然科学版）》2005年第5期84-87,共4页Journal of Beijing University of Chemical Technology(Natural Science Edition)

摘　　要：文中采用溶剂热法合成了两种三维网状无机-有机杂化材料Co(C4H4N2)(VO3)2(Ⅰ)和Ni2(C4H4N2)V4O12(H2O)2(Ⅱ)。分别以n(CoCl2.6H2O)∶n(吡嗪)∶n(NH4VO3)=1∶2∶2和n(NiCl2.6H2O)∶n(吡嗪)∶n(NH4VO3)=1∶2∶2的摩尔比、纯水为溶剂,在140℃下反应3 d,分别得到了紫黑色块状晶体Ⅰ和绿色块状晶体Ⅱ。对影响溶剂热反应的主要因素如反应温度、pH值、反应物摩尔比等进行了系统研究,确定了合成这两种化合物的最佳反应条件。并对产物晶体进行了UV-VIS-NIR漫反射光谱分析和热重分析(TG)。漫反射光谱研究表明,这两种晶体的光学能隙分别为2.13 eV和2.56 eV,都属于半导体,对太阳辐射具有选择吸收特性,它们在温度分别低于410℃和210℃时是稳定的。In this paper, two novel inorganic-organic hybrid compounds Co （C4HaN2）（ VO3 ）2 （ Ⅰ ） and Ni2 （C4HaN2）V4O12（H2O）2（ Ⅱ ） were synthesized by solvothermal reaction. A mixture of CoC12·6H2O, pyrazine and NHaVO3 with a molar ratio 1 ： 2 ： 2 was reacted at 140 ℃ for 3 d and the mixture of NiC12·6H2O, pyrazine and NHaVO3 with a molar ratio 1 ： 2 ： 2 was reacted at 140 ℃ for 3 d, respectively. The reaction conditions such as the reaction temperature, pH value and the mole ratio of reactants were systematicly investigated and the optimum conditions of the reaction were determined. Studies on the optical properties of the powder sample suggest that the two compounds are semiconductor with band gaps of 2.13 eV and 2.56 eV, respectively. The results given by thermogravimetric （TG） analysis indicate that Co（C4HaN2）（VO3）2 is thermally stable up to 410 ℃ and Ni2（C4H4N2）V4O12（H2O）2 up to 210℃.

关 键 词：无机-有机杂化材料 溶剂热法 反应条件 光学性能 

分 类 号：O641[理学—物理化学]