Zhang Xiaoming, Zhang Cheng, Guo Haiquan, Huang Wenlin, Polenova Tatyana, Francesconi Lynn C, Akins Daniel L
Center for Analysis of Structures and Interfaces (CASI), Department of Chemistry, The City College of The City University of New York (CUNY), New York, New York 10031, USA.
J Phys Chem B. 2005 Oct 20;109(41):19156-60. doi: 10.1021/jp052858m.
The novel polyoxometalate ([(Eu2PW10O38)4(W3O8(H2O)2(OH)4)]22-), also referred to herein as Eu8P4W43, has been immobilized inside the channels of MCM-41 mesoporous molecular sieve material by means of the incipient wetness method. For proper host-guest interaction, amine groups were introduced into the system as a result of an aminosilylation procedure. A stable and integrated Eu8P4W43 polyoxometalate was shown to be formed inside the channels of the modified MCM-41. The products were characterized by XRD, UV-vis absorption, emission, Raman excitation, Raman, and 31P solid-state NMR measurements. Infrared and Raman spectra of the polyoxometalate/MCM-41 composite systems are interpreted as showing spectral shifts due to site induced electrostatic interactions. The photoluminescent behavior of the composite at room temperature indicates a characteristic Eu3+ emission pattern corresponding to 5D0- 7F(J) transitions. A strong photoluminescence suggests the potential utility of the polyoxometalate as a luminescent material.
新型多金属氧酸盐（[(Eu2PW10O38)4(W3O8(H2O)2(OH)4)]22-，本文中也称为Eu8P4W43）已通过初湿浸渍法固定在MCM-41介孔分子筛材料的孔道内。为了实现合适的主客体相互作用，通过氨基硅烷化程序将胺基引入该体系。结果表明，在改性MCM-41的孔道内形成了稳定且完整的Eu8P4W43多金属氧酸盐。通过X射线衍射（XRD）、紫外可见吸收、发射、拉曼激发、拉曼和31P固态核磁共振测量对产物进行了表征。多金属氧酸盐/MCM-41复合体系的红外和拉曼光谱表明，由于位点诱导的静电相互作用而出现光谱位移。该复合材料在室温下的光致发光行为表明其具有对应于5D0-7F(J)跃迁的特征性Eu3+发射模式。强烈的光致发光表明该多金属氧酸盐作为发光材料具有潜在用途。
