三维Cu-MOF对亚甲蓝的吸附和光催化降解及其机理

本文报道了[Cu₃(ppda)₃(tib)₂(H₂O)₄]·6H₂O (Cu-MOF)的合成、结构、吸附和光催化降解性能。在Cu-MOF中，1，4-苯二乙酸(H₂ppda)和1，3，5-三(1-咪唑基)苯(tib)配体交替连接Cu离子形成二维层，层与层之间通过trans-ppda^2-相互穿插形成稳定的三维结构。Cu-MOF对亚甲蓝(MB)的催化效率为97%，最高反应速率常数为0.019 7 min^-1。光催化降解机理：在光的激发下，催化剂表面的光生电子和空穴对发生分离，并与O₂、H₂O、H₂O₂反应生成活性物质，将染料降解为CO₂和H₂O。在MB溶液中加入NaCl (200 g·L^-1)后，Cu-MOF的吸附量有所提升(87.23 mg·g^-1)，准二级动力学模型和Langmuir等温线模型的实验数据拟合程度较好，该吸附的主要过程为单层化学吸附。     

A simple strategy for constructing acylhydrazone photochromic system with visible color/emission change and its application in photo-patterning

As a potential photochromic system, acylhydrazones exhibit many outstanding advantages including low cost, simple synthesis and high modifiability compared with some classic photochromic systems. However, the absorption wavelengths of acylhydrazones usually locate in ultraviolet region, which makes the band separation between the absorbance maxima of its irradiated and unirradiated forms cannot be observed by naked eyes and greatly limits their practical applications. In this work, a simple strategy for constructing acylhydrazone photochromic system with visible color/emission change is provided. Rhodamine 6G hydrazine-2-aldehyde-pyridine Schiff base (compound 3) is designed and synthesized by combining acylhydrazone with Rhodamine 6G structure. The introduction of Rhodamine 6G moiety to 3 not only makes it remain all the advantages of acylhydrazone photochromic system but also exhibits visible photo-induced color/emission changes both in solution and in a solid matrix. Moreover, 3 exhibits reversible photochromic property with good fatigue resistance, which makes it an excellent candidate for photo-patterning.     

Cadmium Naphthalenedisulfonate Complex as Heterogeneous Catalyst in the Knoevenagel Condensation

Russian Journal of General Chemistry - The reaction of naphthalene-1,5-disulfonate (1,5-nds), 2,4,5-tris(pyridin-4-yl)imidazole (tpim), and cadmium(II) acetate dihydrate Cd(OAc)2·2H2O afforded...     

Synthesis,Crystal Structures,and Magnetic Properties of Two Manganese(II)/Cobalt(II) Coordination Polymers Constructed by Nitrogenous Carboxylic Acid

Russian Journal of General Chemistry - Two new coordination polymers, {[Mn2(L)(H2O)2]·H2O}n (1) and {[Co2(L)(H2O)2]·H2O}n (2) (H4L = 2-(2,4,6-tricarboxylphenyl)-6-carbxoylbenzimi-dazole),...     

层状钒青铜纳米片的制备及其锂离子电池阳极材料性能

室温下, 在水溶液中将铵根离子和水分子插入到商用V₂O₅纳米颗粒的层间, 制得了层状的钒青 铜[(NH₄)₂V₆O₁₆·H₂O]纳米片. 该纳米片的尺寸为2~10 μm, 厚度为50~250 nm. 与商用V₂O₅纳米颗粒相比, (NH₄)₂V₆O₁₆·H₂O纳米片用作锂离子电池(LIBs)的阳极材料时, 其性能得到较大提升, 包括大的可逆放电容量 (0.1 A/g时为1148 mA·h/g)、 出色的循环性能(循环70圈后在0.1 A/g时具有1002 mA·h/g的高容量)和高倍率性能(在0.1 A/g时具有1070 mA·h/g的可逆性能). 研究结果表明, (NH₄)₂V₆O₁₆·H₂O纳米片可以作为锂离子电池优良的阳极材料, 也有望应用于其它(如钠离子电池和锌离子电池等)可再充电电池.     

A new class of generalized almost perfect nonlinear power function

As a generalization of almost perfect nonlinear functions, generalized almost perfect nonlinear (GAPN) functions defined over finite fields of odd characteristic have also important applications in cryptography and finite geometry. In this paper, we mainly focus on GAPN power functions, and a new class of such function (up to EA equivalence) is obtained. Furthermore, using our method, almost all the known GAPN power functions can be confirmed in a simple way.     

工件的释放时间和加工时间具有一致性的单机在线排序问题研究

工件的释放时间和加工时间具有一致性, 是指释放时间大的工件其加工时间不小于释放时间小的工件的加工时间, 即若$r_{i}\geq r_{j}$, 则$p_{i}\geq p_{j}$。本文在该一致性约束下, 研究最小化最大加权完工时间单机在线排序问题, 和最小化总加权完工时间单机在线排序问题, 并分别设计出$\frac{\sqrt{5}+1}{2}$-竞争的最好可能在线算法。     

两个基于半刚性双甲基苯并咪唑配体的螺旋型镉配位聚合物

以1,4-双（2-甲基苯并咪唑-1-亚甲基）苯（bmb）为主配体与Cd（NO₃）₂反应,通过改变辅助双羧酸配体2个羧基间的连接基团,得到了2个配位聚合物{[Cd（bmb）（tba）]·DMF}_n（1）和[Cd（bmb）（ada）]_n（2）（H₂tda=5-叔丁基间苯二甲酸,H₂ada=1,3-金刚烷二乙酸）。结构分析表明聚合物1显示二维三明治结构,带有交替的左手和右手螺旋链。聚合物2也显示了二维三明治结构,带有meso-螺旋和微孔。聚合物1和2都显示了强的荧光发射和高的热稳定性。     

Magnetic and electrical properties of (Ni0.8Cu0.2)1−x Cox Mn0.02Fe1.9O4 ferrites

The effect of Co substitution on the magnetic and electrical properties of iron-deficient nickel–copper mixed ferrites containing a small quantity of manganese oxide was investigated. The presence of Co enhances the specific magnetization although the saturation magnetization falls a little due to decrement of density. The initial permeability changes linearly with the average grain size of the materials and shows fairly good thermal stability for higher Co concentration. An appreciable increment in DC resistivity along with decrement in dielectric loss factor at 100 MHz can also be obtained for higher Co concentration.