RbLn2F7的水热合成及RbLn2F7:Eu3+(Ln=Gd,Y)的VUV光谱

利用水热方法合成出RbLn2F7（Ln=Gd，Y，Er，Yb和Lu），均为六方RbEr2F7型结构。掺杂Eu^3＋离子样品的光谱表明水热产物中氧杂质含量极低。在RbGd2F7：Eu^3＋（0．5mol％）的激发光谱中只观测到Gd^3＋离子f-f跃迁，Eu^3＋离子的激发跃迁很弱。激发Gd^3＋离子到^6IJ能级后，观测到Eu^3＋离子的特征发射，Gd^3＋离子与Eu^3＋离子之间存在能量传递过程。Eu^3＋离子的^5D0→^7F1和^5D0→F2跃迁发射较强，表明稀土离子在六方HbLn2F7中处于非中心对称的格位。     

红外光谱法测定环氧树脂的环氧值

介绍了用红外光谱法测定环氧树脂的原理、试验条件和允许差,以及该方法在环氧树脂及其预浸料质量控制方面的应用。     

关于单调Brown方法的进一步研究

本文引入了一类较为广泛的函数类，提出了一种新的单调Ｂｒｏｗｎ方法，讨论了这种方法的收敛性，非平凡地推广了Ｆｒｍｍｅｒ的相应结果。     

Electronic properties of one-dimensional quasiperiodic lattices: Green's function renormalization group approach

Using the inflation-deflation symmetry, we have developed a new real-space decimation approach to study the electronic properties of one-dimensional quasiperiodic lattices. The key result is the construction of a compact renormalization group that allows simple calculation of the average Green's function and the average density of states to any degree. The Fibonacci and the generalized Fibonacci lattices are used to demonstrate the method. Numerical results for the average density of states of these lattices show a good agreement with the results obtained by other methods. This confirms the validity and the efficiency of the approach.     

A one-dimensional zigzag coordination polymer: catena-poly­[[di­aqua­pyridine­nickel(II)]-μ-pyridine-2,3-di­carboxyl­ato-κ3N,O2:O3]

The asymmetric unit of the title one-dimensional coordination polymer, [Ni(C₇H₃NO₄)(C₅H₅N)(H₂O)₂]_n, contains a quino­linate dianion, a nickel(II) ion, two water mol­ecules and a pyridine mol­ecule. The pyridine-2,3-di­carboxyl­ate (quino­linate) ligands connect the nickel(II) ions in a head-to-tail fashion, resulting in the formation of a one-dimensional zigzag chain. Adjacent chains form pairs via an extensive network of hydrogen-bonding interactions. A weak C—H...O intermolecular hydrogen bond links neighboring pairs of chains, thus generating two-dimensional double-sheet layers that are stabilized viaπ–π-stacking interactions between adjacent quinolinate pyridyl rings.