Formation of α,α''''-Bis(substituted benzylidene)cycloalkanones from Masked Aldehydes Promoted by Samarium(III) Triiodide

~~Formation of α,α'-Bis(substituted benzylidene)cycloalkanones from Masked Aldehydes Promoted by Samarium(III) Triiodide~~     

Synthesis and characterization of insulin-5-Fu conjugate,enabling insulin as multi-drug carrier via dendritic approach

To enable insulin as multi-drug carrier, we designed and synthesized dendritic linker molecule bearing three 5-Fluorouracil residues at the branch ends. The new conjugate showed excellent water solubility. The stabilities under different conditions were investigated. The results showed that the conjugate was a potential prodrug to release free 5-Fu.     

多金属氧酸盐催化的水氧化研究进展

氢气以其清洁无污染、燃烧值高等优点成为未来最具潜力的可再生能源之一,而清洁生产氢气的最佳选择之一即为裂解水. 利用太阳能模拟光合作用实现水的全分解产生氢气和氧气是目前最为理想的能源转化方式,并且已经引起了众多研究者的关注. 水分解的半反应之一--水氧化反应由于其过程复杂,一直是制约水分解的瓶颈. 所以寻找高效、稳定的水氧化催化剂便成为了突破该瓶颈的关键. 多金属氧酸盐是一类以前过渡金属氧簇为基本单元形成的多金属氧簇化合物. 由于多金属氧酸盐在物理、化学性质方面具有无法比拟的特性,使得其在催化、药物、纳米科技和材料科学等方面已被广泛地应用. 多金属氧酸盐的全无机配体可很好地抵御水氧化反应的强氧化性环境,故将其作为水氧化催化剂越来越引起研究者们的注意,并且已有多种多金属氧酸盐被设计为水氧化催化剂. 本文详细介绍了各种不同过渡金属取代的多金属氧酸盐水氧化催化剂的研究进展.     

荧光可调控的碳量子点的电化学制备及性质研究

采用循环伏安法（Cyclic Voltammetry,CV）在碱性条件下电解石墨棒,得到水溶性的荧光碳量子点. 通过透射电子显微镜（TEM）、拉曼光谱（Raman spectrum）、原子力显微镜（AFM）对所制备的碳量子点进行形貌及结构表征,发现该碳量子点由1～4层石墨烯片层堆积形成,粒径在19 nm左右,厚度在1 nm左右. 通过荧光光谱（PL）、紫外可见吸收光谱（UV-vis）、傅里叶变换红外光谱（FTIR）、X射线光电子能谱（XPS）对所制备的碳量子点进行性质测定,发现该碳量子点在400和525 nm处有两个荧光发射峰,且通过控制扫描周数可以调节两个发射峰的相对强度,从而调控碳量子点的荧光颜色：随着扫描周数的增加,400 nm处发射峰的相对强度逐渐减小,而525 nm处发射峰的相对强度逐渐增大,两个荧光发射峰分别与碳量子点的π-π共轭体系和含氧官能团的n-π共轭体系有关.     

New diterpenoid glucosides from Siegesbeckia pubescens

Plants of the genus Siegesbeckia are annual herbs widely distributed in tropical and temperate zones and they are used as a traditional medicine to treat rheumatic arthritis, hypertension, malaria, neurasthenia and snake-bite in China. In previous papers, we reported on five new ent-kaurane and ent-pimarane diterpenoids, siegesbeckioside, siegesbeckiol and siegesbeckic acid1, orientalin A and B, and eight know compounds2,3. The present paper describes the isolation and structural elucidation …     

Synthesis and Crystal Structure of a Mixed Cu - Cd Bim etallic Com plex ｛〔 Cu Cd(pba)( H_2 O)_3〕·2 H_2 O｝ _n

１　ＩＮＴＲＯＤＵＣＴＩＯＮＨｅｔｅｒｏｍｅｔａｌｐｏｌｙｎｕｃｌｅａｒｃｏｍｐｌｅｘｅｓｈａｖｅｂｅｅｎｔｈｅｓｕｂｊｅｃｔｏｆｍａｎｙｒｅｃｅｎｔｓｔｕｄｉｅｓｔｏｅｌｕｃｉｄａｔｅｔｈｅｍｅｃｈａｎｉｓｍｏｆｓｐｉｎｃｏｕｐｌｉｎｇｂｅｔｗｅｅｎｔｈｅｍｅｔａｌｉｏｎｓ〔１,２〕,ｍｉｍｉｃｋｉｎｇｔｈｅａｃｔｉｖｅｓｉｔｅｏｆｓｏｍｅｍｅｔａｌｅｎｚｙｍｅｓｃｏｎｔａｉｎｉｎｇｄｉｓｓｉｍｉｌａｒｍｅｔａｌｉｏｎｓ,ｓｕｃｈａｓｃｙｔｏｃｈｒｏｍｅｏｘｉｄａｓｅａｎｄｓｕｐｅｒｏｘｉ…     

中心裂纹圆盘应力强度因子的测试误差分析

本文在中心裂纹圆盘应力强度因子解析解的基础上,利用一阶微分法则,给出了与裂纹相对长度和加载角相关的应力强度因子(K 和K )的4个误差传递函数。这4个误差传递函数关于裂纹相对长度和加载角均是非线性的,它们既是误差分析的基础,又是合理确定裂纹相对长度和加载角的基础。分析结果表明,加载角的误差Δθ除了对纯 型K 的误差几乎没有影响,对纯 型K 影响较小外,对复合型K 、K 的误差均有较大影响。最后,本文建议裂纹相对长度的取值范围为0.4～0.6;还建议在复合型断裂试验时,必须依据对K 、K 的总体精度要求来严格控制加载角的精度。     

Synthesis and Characterization of Poly(ether imide)s Containing m-Methyl and Phthalazinone Moieties

Aromatic polyimides are distinguished for their excellent mechanical and thermal properties in many engineering fields1. However, aromatic polyimides are normally insoluble in common organic solvents, which restricts their applications in some fields. Many efforts have been taken to improve their solubility. Introducing bulky side groups and non-coplanar structure into polymers bone chains is a good way to obtain the polymers with excellent mechanical and thermal properties2. In this paper…     

An Efficient and Green Procedure for the Preparation of gem-Dicar- boxylates from Aldehydes Catalyzed by Fe_2(SO_4)_3·xH_2O

~~An Efficient and Green Procedure for the Preparation of gem-Dicar- boxylates from Aldehydes Catalyzed by Fe_2(SO_4)_3·xH_2O~~     

A New Quantum State

１ＩｎｔｒｏｄｕｃｔｉｏｎＩｔｉｓｗｅｌｋｎｏｗｎｔｈａｔｂｏｓｏｎｒｅａｌｉｚａｔｉｏｎａｐｐｒｏａｃｈｉｓｖｅｒｙｅｆｅｃｔｉｖｅｔｏｓｔｕｄｙｔｈｅｒｅｐｒｅｓｅｎｔａｔｉｏｎｔｈｅｏｒｙｏｆｇｒｏｕｐ，ａｎｄｔｈｅｂｏｓｏｎｒｅａｌｉｚａｔ...