Formation of SnO2 Nanoparticles on External Surface of NaY Zeolite

Tin dioxide nanoparticles of 5 nm in size were prepared on NaY zeolite external surface by impregnation of SnCl2 solution and subsequent calcination at 623 K. A SnO2-NaY based chemical sensor for detecting H2 was demonstrated.     

Forming and Gathering of SnO2 Nanoparticles on External Surface of High Silica TON, MFI and FAU Type Zeolites

Tin dioxide （SnO2） nano-particles were prepared on high silica TON, MFI and FAU type zeolites by impregnation of SnC12 solution and subsequent calcination at 873 K. XRD and SAED were used to characterize the crystalline phase, and TEM was used to characterize the morphology, the particle size and the agglomerative state of the formed nano-materials. The nano-particles, which possess 8 nm, 10-80 nm and 6 nm in size, were found to form on the outer surface of TON, MFI and FAU zeolites, respectively. SnO2 microcapsules and SnOz netlike nanostructure were obtained by decomposition of SnO2-TON and SnO2-MFI in 40% hydrofluoric acid at room temperature. Compared with the nano-particles formed on NaY zeolite, the special morphology and the agglomerative state of SnO2 nanostructures on TON and MFI type zeolites with one and two dimension channel system indicate that the heterogeneous framework, surface structure and property perform important function for forming and growing SnO2 nanostructure on the outer surface of the zeolites.     

8-喹啉氧基乙酸铅(Ⅱ)一维配位聚合物的合成、晶体结构和性质

采用水热法合成了一个新的一维铅(Ⅱ)配位聚合物[Pb(QOA)2]n(QOA=8-喹啉氧基乙酸根离子),通过红外光谱、元素分析和X-射线单晶衍射分析给予表征。该配位聚合物属于单斜晶系,C2/c空间群。晶胞参数a=2.113 2(2)nm,b=1.189 86(7)nm,c=0.790 73(2)nm,β=99.081(3)°,V=1.963 3(4)nm3,Z=4。固体UV-Vis-NIR漫反射光谱结果显示它的光学能隙约为3.4 eV,表明配合物具有潜在的半导体性质。固体荧光测定表明配合物表现出良好的荧光性质。     

8-喹啉氧基乙酸铅(Ⅱ)一维配位聚合物的合成、晶体结构和性质

采用水热法合成了一个新的一维铅（Ⅱ）配位聚合物[Pb（QOA）₂]_n（QOA=8-喹啉氧基乙酸根离子）,通过红外光谱、元素分析和X-射线单晶衍射分析给予表征。该配位聚合物属于单斜晶系,C2/c空间群。晶胞参数a=2.1132（2）nm,b=1.18986（7）nm,c=0.79073（2）nm,β=99.081（3）°,V=1.9633（4）nm³,Z=4。固体UV-Vis-NIR漫反射光谱结果显示它的光学能隙约为3.4eV,表明配合物具有潜在的半导体性质。固体荧光测定表明配合物表现出良好的荧光性质。     

A STUDY OF RAMAN SCATTERING AND INFRARED ABSORPTION SPECTRUM IN A NEW SERIES OF MERCURY-BASED HIGH-Tc SUPERCONDUCTOR (Hg,Mo)Sr2(Y1-xCax)Cu2O6+δ

Lattice vibrations of the (Hg,Mo)Sr₂(Y_1-xCa_x)Cu₂O_6+δ—a new series of mercury-based high-T_c superconductor are analyzed with the aid ofgroup theory. The vibrations of species are given. They are 4A_1g+ B_1g+ 5E_g+ 7A_2u + B_2u+ 8E_u. The 4A_1g, B_1g and 5E_g modes are Ramma active, the 6A_2u and 7E_u are infrared active. Phonon vibration characteristics of the samples are studied using Raman scattering and infrared absorption spectra. The experimental results show that the typical phonon vibrational modes appear mainly at 145, 320, 440, 578, 592 and 645cm^-1, The intensities of the 145, 320, 440, 578 and 645 peaks decrease with increasing Ca content x and the position of 645 peak moves to higher wavenumber slightly. In this article, the phonan modes are assigned and their variation behavior with increasing Ca content x are discussed.     

二氧化锡纳米粒子在高硅TON，MFI和FAU型沸石外表面的形成和聚集

将高硅TON, MFI和FAU沸石分别浸渍于SnCl₂溶液，再于873 K温度下焙烧，在高硅TON,MFI和FAU沸石外表面制备出二氧化锡纳米粒子。用XRD和SAED表征生成物的物相，TEM表征形成二氧化锡纳米粒子的形貌、尺寸和聚集状态。结果显示：在TON, MFI和FAU沸石外表面形成二氧化锡纳米粒子的尺寸分别在8 nm, 10-80 nm和6 nm。在室温下用40%的氢氟酸分解SnO₂-TON和SnO₂-MFI分别得到二氧化锡微胶囊和网状的二氧化锡纳米结构。同在NaY沸石表面形成的纳米二氧化锡比较，在具有一维孔道体系的TON沸石和二维孔道体系的MFI沸石外表面形成的纳米二氧化锡的形貌与聚集状态都不相同，这表明沸石的骨架类型、表面结构与特性在沸石外表面形成二氧化锡纳米结构时起重要作用。     

A STUDY OF RAMAN SCATTERING AND INFRARED ABSORPTION SPECTRUM IN A NEW SERIES OF MERCURY-BASED HIGH-Tc SUPERCONDUCTOR (Hg,Mo)Sr2(Y1-xCax)Cu2O6+δ

Lattice vibrations of the (Hg,Mo)Sr₂(Y_1-xCa_x)Cu₂O_6+δ—a new series of mercury-based high-T_c superconductor are analyzed with the aid ofgroup theory. The vibrations of species are given. They are 4A_1g+ B_1g+ 5E_g+ 7A_2u + B_2u+ 8E_u. The 4A_1g, B_1g and 5E_g modes are Ramma active, the 6A_2u and 7E_u are infrared active. Phonon vibration characteristics of the samples are studied using Raman scattering and infrared absorption spectra. The experimental results show that the typical phonon vibrational modes appear mainly at 145, 320, 440, 578, 592 and 645cm^-1, The intensities of the 145, 320, 440, 578 and 645 peaks decrease with increasing Ca content x and the position of 645 peak moves to higher wavenumber slightly. In this article, the phonan modes are assigned and their variation behavior with increasing Ca content x are discussed.     

无机化学实验“教、学、考”三位一体教学研究初探

报道了无机化学实验“教、学、考”三位一体课堂教学的内容和做法,连续两年的教学实践表明,新方法在培养学生能力和毅力方面成效显著,同时也分析了新方法运作需要的若干条件