Synthesis,structure and properties of aquabis(2,4′-bipyridine)di(propionato-O)copper(II)

The title complex has been synthesized and characterized by elemental and thermal analysis, IR and electronic spectroscopy, conductivity studies and X-ray crystallography. In the crystal, the complex has two-fold symmetry and the copper atom adopts square pyramidal coordination. Bond valences for Cu were computed. Cu–O_(propionate) bonds are slightly stronger than the Cu–N bonds, and the Cu–O_(water) bond is distinctly weaker. Molecules are linked by O–H···O hydrogen bonds to form infinite hydrogen-bonded chains along the y axis.     

Synthesis and Spectroscopic Characterization of Silver(I) Complexes of Selenones

Silver(I) complexes of selenones, [LAgNO₃] and [AgL₂]NO₃ (where L is imidazolidine-2-selenone or diazinane-2-selenone and their derivatives) have been prepared and characterized by elemental analysis, IR and NMR (¹H, ¹³C and ¹⁰⁷Ag) spectroscopy. An upfield shift in the C=Se resonance of selenones in ¹³C NMR and a downfield shift in N-H resonance in ¹H NMR are consistent with selenium coordination to silver(I). In ¹⁰⁷Ag NMR, the AgNO₃signal is deshielded by 450-650 ppm on coordination to selenones. Greater upfield shifts in ¹³C NMR were observed for [LAgNO₃] compared to [AgL₂]NO₃complexes, whereas the opposite trend was observed for ¹H and¹⁰⁷Ag NMR chemical shifts.     

Copolymerization of styrene and norbornene with β‐diketiminato nickel/methylaluminoxane catalytic system

Styrene–norbornene (S‐N) copolymerizations were carried out using β‐diketiminato nickel complexes CH{C(CF₃)NAr}₂NiBr (Ar = 2,6‐ⁱPr₂C₆H₃, 1 ; Ar = 2,6‐Me₂C₆H₃, 2 ) in the presence of methylaluminoxane. The influence of the comonomer feed content and polymerization temperature on the conversion and composition of the copolymers with the catalytic system was investigated. An increase in the feed ratio of S/N led to an increase in the incorporated styrene content of the resulting copolymer. NMR characterization of the copolymers generated with the catalytic systems showed that the random S‐N copolymers are produced. Differential scanning calorimetric determination of the copolymers shows higher T_g values than polystyrene, and gel permeation chromatographic measurements have shown that the copolymers possess rather narrow molecular weight distributions, suggesting that the copolymerization take place at a single active site. Copyright © 2012 John Wiley & Sons, Ltd.     

Study of electron solvation in polar solvents using path integral calculations

A path-integral Monte Carlo algorithm for the simulation of electrons solvated in polar liquids is briefly outlined, and results are presented for the electron solvated in liquid water.     

三氯化硼－四氢呋喃络合物催化二乙氨基环硫丙烷的聚合反应

研究了二乙氨基环硫丙烷在三氟化硼－四氢呋喃络合物（ＲＦ３·ＴＨＦ）催化下的聚合反应．与使用ＢＦ３·Ｅｔ２Ｏ作催化剂时聚合物沉淀析出的情况不同，在ＢＦ３·ＴＨＦ催化下，可得到均相粘性聚合物，而且部分四氢呋喃参与了共聚合反应．通过改变催化剂和溶剂的用量以及单体的加料方式制得了一系列组成和分子量不同的共聚物，用元素分析、核磁、红外、分子量测定等测试手段对聚合物进行了表征，还讨论了聚合反应的机理．     

闭式－氢硼酸二茂铁甲酰丙酮缩异菸肼稀土配合物

将二茂铁甲酰丙酮与异菸肼缩合，生成金属有机多齿新配体，该配体（ＦＣＲ）与闭式－十二氢十二硼酸稀土化合物反应，得到分子式为［Ｌｎ（ＦｃＲ）２］２（Ｂ１２Ｈ１２）３·ＸＨ２Ｏ（Ｌｎ＝Ｌａ，Ｎｄ，Ｅｕ，Ｇｄ，Ｄｙ，Ｈｏ，Ｅｒ，ＴｍａｎｄＬｕ）的９个配位化合物，经元素分析、红外光谱、紫外光谱对其组成、结构进行了表征，通过ＴＧ－ＤＴＡ研究了它们的热行为．     

1，1’－联－2－萘酚硼烷的辛可宁和麻黄碱衍生物的合成

１，１’－联－２－萘酚硼烷的辛可宁和麻黄碱衍生物的合成单自兴，孙杰，段标，杨洗，赵德杰（武汉大学化学系，武汉，４３００７２）关键词１，１’－联－２－萘酚，硼烷，辛可宁，麻黄碱，硼烷配合物，合成中国法分类号Ｏ６２７·３１ｌ，ｌ’一联一２一条酚在大环化学...     

钯与希夫碱类配合物的合成与表征

合成了把(I)与五个希夫碱的七个新配合物:(L1-H)护d, 相似文献   

非线性复杂系统的动力学问题

根据非线性动力学的研究现状和发展趋势,从六个方面去展望复杂系统的非线性动力学研究在21世纪的动向,探讨与其有关的动力系统理论和应用研究中面临的一些重大问题。     

有关力学谱和内耗工作的综合与回顾

本文广泛地收集了有关内耗，力学谱，超声衰减方面的专著及会议文集。反映了20世纪在此领域的英文，俄文出版的书籍。也列出了历次国际会议及前苏联，乌克兰，中国的国内会议。文中包括了点缺陷，电，声子，位错，晶界，电畴等诸方面在内的内耗与力学谱工作。