3，5-二硝基水杨酸和菲咯啉构筑的两个镧配合物的合成、晶体结构及荧光性质

以3,5-二硝基水杨酸（H₂dns）和菲咯啉（phen）为配体合成了2个新的镧配合物[La₂（dns）₂（Hdns）₂（phen）₄]（1）和[La₄（dns）₆（phen）₆]（2）,并对它们进行了红外分析、元素分析、热重分析和单晶结构分析。单晶衍射结果表明,配合物1和2均为三斜晶系,P1空间群。配合物1和2中La（Ⅲ）通过配体H₂dns桥联分别形成双核结构和四核结构。热重和荧光分析表明：2热稳定性高于1,1和2均在467 nm处有最强荧光发射强度。     

基于三唑配体的金属锰(Ⅱ)、锌(Ⅱ)配合物的合成、晶体结构与性质研究(英文)

在不同反应条件下,采用三唑衍生物作为配体与乙酸锰和硝酸锌反应,合成了2个具有三维结构的配位化合物{Mn(pytyba)(H2O)3]·2H2O}n(1)和{[Zn(pytyba)(H2O)3]·4H2O}n(2),并通过元素分析、热重分析、荧光性、X射线单晶衍射对化合物进行分析。结构分析表明1和2有许多共同特征:两个聚合物的晶体均属于单斜晶系,C2/c空间群,Mn2+和Zn2+均为六配位畸变八面体配位结构,具有相似的热稳定性、荧光性以及相近的孔隙率。配体中的氧原子与金属离子配位形成一维链状结构,然后又通过O-H…N、O-H…O氢键作用和π…π芳香堆积形成超分子结构。此外,通过测定化合物抗氧化活性(SOD)的经典方法-Marklund法对配合物1和2的抗氧化活性进行了研究。     

Influence of peripheral alkyl chain length on the mesomorphic behaviours of hexasubstituted triphenylene 2,3-dicarboxylic esters

A comparative study of our established synthetic approaches to hexasubsituted triphenylenes 2,3-dicarboxylic esters containing four identical β-alkoxy and two adjacent β-alkoxycarbonyl side chains shows that the phase behaviours of small-sized discotic liquid crystals can be tailored over a wide range by simply varying the length of the peripheral alkyl chains. All the prepared esters in two series were observed to form a single hexagonal columnar phase, except for Tp4-1 having four β-butyloxy and two adjacent β-methoxycarbonyl chains which displays two columnar mesophase behaviours with a transition from the columnar plastic phase to hexagonal columnar phase. A significant difference between the two mesophase was observed in the variable temperature X-ray diffraction studies, and the mesophase assignment was also confirmed by polarising optical microscopy and differential scanning calorimetry. Moreover, the prepared esters in each series display the general trend of decreasing clearing temperature upon increasing alkoxy or alkoxycarbonyl chains length. The intermediate triphenylene 2,3-dicarboxylic acids were also found not only to exhibit columnar hexagonal mesophase over a narrower temperature range by maintaining high melting and clearing points but also to form organogel on mixing with toluene or dichloromethane with the assistance of hydrogen bonding.     

In0.3Co4Sb12-xSex 方钴矿热电材料的制备和热电性能

用熔融退火结合放电等离子烧结法制备了In_0.3Co₄Sb_12-xSe_x(x=0—0.3)方钴矿热电材料,探讨了In的存在形式,系统研究了Se掺杂量对结构和热电性能的影响.结果表明:In可以填充到方钴矿二十面体空洞处,过量In在晶界处形成InSb第二相,Se对Sb的置换使晶格常数减小,In填充上限降低;In_0.3Co₄Sb_12-xSe_x样品呈n型传导,随着Se掺杂量的增大,载流子浓度降低,电导率下降,Seebeck系数增大,功率因子有所降低;由于在结构中引入了质量波动及晶格畸变,适量的Se掺杂可以大幅降低材料晶格热导率;样品In_0.3Co₄Sb₁₂和In_0.3Co₄Sb_11.95Se_0.05的最大ZT值均达到1.0以上. 关键词： 掺杂 填充式方钴矿 热电性能     

熔体旋甩法制备p型填充式方钴矿化合物Ce0.3Fe1.5Co2.5Sb12的微结构及热电性能

采用熔体旋甩法结合放电等离子烧结技术(MS-SPS)制备了p型填充式方钴矿化合物Ce_0.3Fe_1.5Co_2.5Sb₁₂,研究了熔体旋甩工艺对微结构以及热电性能的影响规律.结果表明,较高的铜辊转速和较低的喷气压力有利于提高熔体的冷却速率,使带状产物晶粒细化.薄带经SPS烧结后得到致密、基本单相、晶粒尺寸均匀细小(150—300 nm)的块体.与传统方法制备的试样相比,MS-SPS试样虽然电导率有所降低,但因具有较大的Se 关键词： 熔体旋甩 p型填充式方钴矿化合物 微结构 热电性能     

3,5-二硝基水杨酸和菲咯啉构筑的两个镧配合物的合成、晶体结构及荧光性质

以3,5-二硝基水杨酸（H₂dns）和菲咯啉（phen）为配体合成了2个新的镧配合物[La₂（dns）₂（Hdns）₂（phen）₄]（1）和[La₄（dns）₆（phen）₆]（2）,并对它们进行了红外分析、元素分析、热重分析和单晶结构分析。单晶衍射结果表明,配合物1和2均为三斜晶系,P1空间群。配合物1和2中La（Ⅲ）通过配体H₂dns桥联分别形成双核结构和四核结构。热重和荧光分析表明：2热稳定性高于1,1和2均在467 nm处有最强荧光发射强度。     

Perfect Optical Nonreciprocity with Mechanical Driving in a Three-Mode Optomechanical System *

Nonreciprocal devices are indispensable for building quantum networks and ubiquitous in modern communication technology. Here, we study perfect optical nonreciprocity in a three-mode optomechanical system with mechanical driving.The scheme relies on the interference between optomechanical interaction and mechanical driving. We find perfect optical nonreciprocity can be achieved even though nonreciprocal phase difference is zero if we drive the system by a mechanical driving with a nonzero phase. We obtain the essential conditions for perfectoptical nonreciprocity and analyze properties of the optical nonreciprocal transmission. These results can be used to control optical transmission in quantum information processing.      

含双咪唑配体的锌配位聚合物的晶体结构、荧光性质及抑菌性能研究

本文报道了一个基于双咪唑配体的锌配位聚合物[Zn(oxa)(bbi)]n(1)(oxa=草酸,bbi=1,1′-(1,4-丁二基)双咪唑),并对该化合物进行元素分析、红外和X-射线单晶衍射分析。结果表明标题化合物通过配位键和π-π堆积作用力形成了一个由(4,4)拓扑形状的二维网络组成的具有大孔洞的三维金属有机框架结构。除此之外,测定了配合物1的荧光发射光谱并对其微生物抑菌性能进行了初步研究。     

普鲁士蓝增敏压电均相免疫分析法测定免疫球蛋白G

建立了普鲁士蓝增敏的均相压电免疫分析法,用于人尿液中免疫球蛋白G(IgG)的检测.本方法以蛋白质为种子,形成蛋白质-普鲁士蓝粒子,该粒子不断“滚雪球”增大,使得压电检测信号明显放大.在pH 4.0、盐浓度0.1 mol/L,5 mmol/L FeC13,2.5 mmol/L K4Fe(CN)6(K4Fe(CN)6与蛋白浓度比≥5000),FeCl3加样速度为0.5 μL/s的优化条件下,IgG的检测范围为0～625 nmol/L;检出限为2.4 nmol/L.α1-微球蛋白,β2-微球蛋白、尿微量白蛋白均无明显干扰.本方法用于临床样本的IgG测定,并与免疫比浊法进行对比,两者结果一致,表明本方法可行.     

Delay line readout of a large dimension multi-wire proportional chamber

A two dimensional multi-wire proportional chamber with delay line readout was developed, which has a large sensitive area of 30 cm× 30 cm. Two cathode planes using printed circuit boards are orthogonally placed to give two coordinates of the impact point of the particle. Signals collected from the cathode strips are amplified and discriminated from two ends of the delay line at each cathode board. By recording the time difference between the two discrimination pulses and the common gate pulse from anode wires, a coordinate position was reconstructed, and a position resolution of better than 1 mm could be obtained in the whole sensitive area along the anode wires.