μ-酰基与μ-烯基铁硫原子簇配合物的合成及结构

由芳香族酰氯或α,β-不饱和酰氯与十二羰基三铁-硫醇-三乙胺体系反应,制得了通式为[(μ-RS)(μ-R′CO)Fe,(CO)_6](A)的六个铁硫原子簇配合物,以及通式为((μ-RS)(μR″CH=CR′)Fe_2(CO)_6](B)的六个铁硫配合物。对两种类型的配合物生成的过程及转化进行了初步的讨论。     

金汞齐富集冷原子荧光测汞法的研究

本文介绍了一种用于测定汞的金汞齐富集热解系统。研究了该系统与冷原子荧光测汞仪联用的工作条件和干扰,在最佳条件下的检出下限为4×10~(-13)克汞,分析周期3分钟,相对标准偏差2.5%(1.5×10~(-9)克汞)。     

高温超导体制备条件的人工神经网络识别

高温超导体的制备条件要求严格,其掺杂量大小、烧结温度控制等都直接影响实验样本的超导性质。近几年高温超导研究已积累大量实验数据,如何应用人工智能方法处理这些数据寻找更好的合成条件颇有意义。人工神经网络方法在许多领域己显示其处理复杂数据和模式识别的优越性,但尚未应用到化合物制备研究方面。本文对此作了初步尝试。     

Single crystal tin nano-rod arrays electrodeposited by a soft template

Single crystal tin nano-rod arrays were fabricated by the electrodeposition method when amphiphilic triblock copolymer P123 was used as a soft template at a concentration much lower than that for forming a liquid crystalline phase.     

卡尔曼滤波分光光度法同时测定钢样中的硅、磷、砷

研究了在聚乙烯醇存在下,硅、磷、砷钼杂多酸与罗丹明6G形成离子缔合物的反应,建立了能同时测定硅、磷、砷的卡尔曼滤波分光光度法。用于钢样中微量硅、磷、砷的同时测定,操作简便快速,相对误差小于8％。     

The complexation of apo-metallothionein with cadmium ion and its conformation study

The circular dichroism was used to study the complexation of two isoforms of rabbit liver apo-metallothioneins (apo-MT1 and apo-MT2) with Cd²⁺ ion and the influence of Cd²⁺ ion on the conformation of reconstituted MTs. The stability of sulfhydryls of apo-MT has been investigated at the room temperature in the presence of air. The reconstitutions of apo-MT1 with Cd²⁺ ion were carried out atpH 4.71 (stable state) andpH 7.9 (with 90% sulfhydryls oxidated) respectively. it was found that the characteristic CD band at 257 nm(+), 238 nm(?), 226 nm(+) of reconstituted MT with Cd²⁺ ion was the same as native MT atpH 4.71, however only one peak at 243 nm(+) appeared on the CD spectra atpH 7.9 which arose from mononuclear complexes with four separated thiolate ligands per Cd²⁺ ion. The CD spectra of apo-MTs+7 eq Cd²⁺ system were measured at variouspH values. It was found that the peak at 256 nm of apo-MT1 binding Cd²⁺ ion split into two small peaks atpH between 2.42 and 3.02, and became one peak atpH 3.32, while the shapes of Cd peaks of apo-MT2 binding Cd²⁺ ion did not change withpH, indicating that the binding sites and pathway of apo-MT1 binding Cd²⁺ ion were different from those of apo-MT2. A possible mechanism was suggested.     

电子探针定量分析的标准样品——几种多元氧化物单晶

在很高的温度和适宜的生长条件下,分别采用熔盐籽晶法和高温引上法生长了高质量的YAP、NAB、KTP、LN、BBO、SBN等多元氧化物单晶,它们具有优良的物理化学性能,严格的化学比,固定的组成与结构以及较好的化学均匀性和电子束轰击下的稳定性。广泛地用于激光和非线性光学领域。我们选用这些晶体为原材料研制电子探针定量分析的标准样品。经过测量和标定,这些单晶标样符合中华人民共和国国家标准GB 4930-85(电子探针显微分析标准样品通用技术条件)的规定。含有稀土元素的标样如NAB和YAP能发出绿色荧光,是电子显微术中理想的阴极发光材料。     

二苄亚砜硝酸钕的晶体结构

二苄亚砜硝酸钕Nd(NO_3)_3·[(C_6H_5CH_2)_2S0]属三斜晶系,P1空间群,晶胞参数:a=9.835(2),b=12.445(2),c=19.971(5)A,α=104.13(2)°,β=90.34(2)°γ=74.96(1)°Z=2。晶体结构用重原子法解出,经最小二乘修正后R因子为0.031。钕离子由九个氧配位,形成稍歪扭的三帽三方棱柱配位多面体,其中一个三角面由三个二苄亚砜(DBSO)提供的氧形成,其他氧原子则由硝酸根提供。平均Nd-O(DBSO)=2.379A,Nd-O(NO_3)=2.536A。