化學(xué)

化學(xué)

四例基于1,4-雙（3-/4-吡啶基）-2,3-二氮雜-1,3-丁二烯的配位聚合物的組裝和性質(zhì)：金屬離子對(duì)結(jié)構(gòu)的影響

周杰，董順?lè)?，喬永鋒，等

通過(guò)水熱合成法，合成了4例由混合配體構(gòu)筑的的過(guò)渡金屬配位聚合物：{[Zn(4-bpdb)(pnba)2]·4H2O}n(1), [Cd(4-bpdb)(pnba)2]n(2), {[Cd2(3-bpdb)2(OAc)4]·5H2O}n(3), 和{[Co(3-bpdb)(pnba)2(H2O)2]·2H2O}n(4) (4-bpdb=1,4-雙（4-吡啶基）-2,3-二氮雜-1,3-丁二烯，3-bpdb=1,4-雙（3-吡啶基）-2,3-二氮雜-1,3-丁二烯，Hpnba=對(duì)硝基苯甲酸，HOAc=乙酸），并且分別用X-射線單晶衍射、元素分析、紅外光譜、熱差分析、X-射線粉末衍射表征了這4個(gè)配合物。晶體結(jié)構(gòu)分析表明，配合物1顯示出一維鋸齒形鏈狀結(jié)構(gòu)，金屬鋅（Ⅱ）離子具有稍微變形的四面體配位幾何構(gòu)型。而配合物2和3卻展現(xiàn)出一維梯狀雙鏈結(jié)構(gòu)，鎘（Ⅱ）離子展現(xiàn)出五角雙錐幾何構(gòu)型。而配合物4卻擁有一維直線型鏈狀結(jié)構(gòu)，其中鈷（Ⅱ）離子擁有八面體幾何形狀。上述結(jié)果說(shuō)明，金屬離子的幾何構(gòu)型可能對(duì)配合物的結(jié)構(gòu)具有重要的影響。此外，還研究了配合物1～3的熒光性質(zhì)。

雙吡啶配體；配位聚合物；晶體結(jié)構(gòu)；熒光性質(zhì)

來(lái)源出版物：無(wú)機(jī)化學(xué)學(xué)報(bào), 2015, 31(11): 2095-2102聯(lián)系郵箱：趙琦華，qhzhao@ynu.edu.cn

活性炭/LiNi0.5Mn1.5O4電容器性能及活性炭負(fù)極的劣化分析

楊柳，齊力，王宏宇

摘要：為提高電化學(xué)電容器的工作電壓，采用電池材料LiNi0.5Mn1.5O4（LNMO）為正極，活性炭為負(fù)極，組裝成混合型電容器并探索了提高其性能的最佳條件。負(fù)/正極質(zhì)量比增加、充放電截止電壓的升高均能顯著提高電容器的放電容量和能量密度，在負(fù)/正質(zhì)量比為4，電壓0～3 V，電流密度1×10-3A/cm2的條件，700次循環(huán)后容量保持率達(dá)97.5%。運(yùn)用三電極體系、電化學(xué)阻抗譜等測(cè)試手段對(duì)此負(fù)極活性炭的劣化及其對(duì)電容器性能的影響進(jìn)行了深入探索。

關(guān)鍵詞：LiNi0.5Mn1.5O4；活性炭；電化學(xué)電容器；劣化機(jī)制

來(lái)源出版物：應(yīng)用化學(xué), 2015, 32(11): 1327-1334

聯(lián)系郵箱：王宏宇，hongyuwang@ciac.ac.cn

來(lái)源出版物：Chinese Journal of Polymer Science, 2015, 33(10): 1373-1379

聯(lián)系郵箱：HUANG Yan-bin, yanbin@tsinghua.edu.cn

封面介紹：The cover picture shows the synthesis of hyaluronic acid gadolinium complex (HA-Gd-DTPA) nanosphere from natural hyaluronic acid molecule through complexation and assembly. The nanosphere, as a novel magnetic resonance imaging (MRI) contrast agent, is specially used to the examination and diagnosis of the lymphatic system disease because the hyaluronic acid is a highly promising lymphatic targeting carrier.

Hyaluronic acid-gadolinium complex nanospheres as lymphatic systemspecific contrast agent for magnetic resonance imaging

WU Guang-yu, ZHANG Hua-juan, ZHAN Zu-feng, et al

Abstract:A novel MRI contrast agent, hyaluronic acid gadolinium complex (HA-Gd-DTPA) nanospheres, is prepared by the synthesis of hyaluronic acid gadolinium complexes and their assembly. The physicochemical properties are characterized, and the lymphatic targeting in vitro and in vivo are also evaluated. The results show that the HA-Gd-DTPA nanospheres with suitable and stable physicochemical properties could be used for in vivo lymphatic targeting studies. Furthermore, the HA-Gd-DTPA nanospheres have obviously higher relaxation efficiency and MRI contrast between blood vessel and lymph vessel in rabbit than that of Magnevist. Thus, the novel MRI contrast agent can be taken up selectively by lymphatic system and used as a potential MRI contrast agents in lymphatic system.

Keywords:magnetic resonance imaging; hyaluronic acid; lymphatic system

來(lái)源出版物：Chinese Journal of Chemistry, 2015, 33(10): 1153-1158聯(lián)系郵箱：XU Jian-rong, xujianr@hotmail.com

Sierpiński-triangle fractal crystals with theC3vpoint group

LI Na, ZHANG Xue, GU Gao-chen, et al.

Abstract:Self-similar fractals are of importance in both science and engineering. Metal-organic Sierpiński triangles are particularly attractive for applications in gas separation, catalysis and sensing. Such fractals are constructed in this study by using 120° V-shaped 4,4"-dicyano-1,1': 3',1"-terphenyl molecules and Fe atoms on Au(1 1 1), and studied in detail by low-temperature scanning tunneling microscopy. Density functional theory calculations are employed to rationalize the invisible Fe atoms in STM images. Monte Carlo simulations are performed to understand the formation mechanism of the surface-supported fractal crystals.

Keywords:STM; MOF; fractal; sierpiń; ski triangle

來(lái)源出版物：Chinese Chemical Letters, 2015, 26(10): 1198-1202

聯(lián)系郵箱：Pawe? Szabelski, szabla@vega.umcs.lublin.pl

Effects of PEG molecular weight on its interaction with albumin

LAI Jing-jing, YAN Huai-yu, LIU Yan, et al.

The fluorescence property of bovine serum albumin was investigated in the presence of PEGs of different molecular weights. Based on our results, we propose that PEGs of different molecular weights bind to albumin in the pH7.4 aqueous solution, but only when the polymer size is larger than the protein size, one polymer chain may bind to multiple proteins and cause the proteins to aggregate.

Polyethylene glycol; bovine serum albumin; protein-polymer interactions; fluorescence analysis