共查询到20条相似文献,搜索用时 0 毫秒
1.
2.
3.
4.
5.
6.
7.
8.
9.
10.
Coordination Chemistry of Rhenium (VII). IX. 8-Hydroxyquinoline Complexes of Rhenium (VII) Perrhenylchloride gives with 8-hydroxyquinoline complexes of the composition ReO3cl(HOx)2 in small polar solvents and ReO3Cl(HOx)· nHOx, (n ≈? 0.3 to 1) in the presence of alcohols. The conditions of preparation and the properties refer to an unidentate ligand HOx in ReO3Cl(HOx)2 and a bidentate ligand in ReO3Cl(HOx) · nHOx. The quinolinato complex ReO3Ox (DMF) is formed in DMF. 相似文献
11.
12.
A comprehensive review has been made to discuss the role of various radionuclides of lanthanide series elements in the field
of nuclear medicine. The role of several pharmaceuticals labeled with radiolanthanides and used for investigative purposes
like measurement of cerebral blood flow, bone density measurement, bone marrow imaging, etc., have been described. The role
of lanthanide radionuclides in radiation synovectomy, radioimmunotherapy, etc., have also been discussed. Methods of preparation
of some representative radiopharmaceuticals like153Sm-EDTMP,153Sm-HYP, have been presented. An outline on the production of carrier free radioisotopes of lanthanide series elements has
been given. 相似文献
13.
Abstract In this paper the light-induced grafting reaction of dimethyl maleate, diethyl maleate, dibutyl maleate and diethyl fumarate, onto aryloxysubstituted phosphazene polymers, to form polyphosphazene copolymers containing grafted succinate groups, is investigated by means of IR spectroscopy and the equilibrium swelling technique of polyphosphazene films. The importance of several different experimental factors that can influence the final succinate grafting yields is discussed, i.e. the type and concentration of the polyphosphazenes and of the unsaturated products, reaction time, the absence or presence of molecular oxygen or of the 1-vinyl-2-pyrrolidone monomer, and the concentration of the benzoin ethyl ether photoinitiator. Furthermore, it is shown that the overall efficiency of the lightinduced grafting process is lower than that previously measured for the reaction initiated thermally using peroxide species, and that the photochemical grafting reaction always occurs with no degradation of the phosphazene macromolecules. The possibility of exploiting these new phosphazene substrates in blend technology has been considered. 相似文献
14.
15.
16.
17.
18.
19.
20.
铀-236是一种重要的人工放射性核素, 是三种天然铀同位素之外可以应用在环境示踪、核应急、核取证以及核保障中的一种铀同位素. 人工236U主要是由核燃料235U经过中子照射后吸收中子产生, 因此, 不同“年龄”阶段核燃料中的236U和其他同位素的比值(指纹特征)截然不同. 同时不同反应堆类型中相应指纹特征也不尽相同. 通过监测核燃料、可疑核材料以及环境样品中不同236U/238U、236U/235U同位素比值等指纹特征即可确认反应堆运行状况、追溯核材料来源出处, 甚至可以开展放射性核污染物在环境中的迁移模拟等问题. 铀-236属于低丰度同位素, 其在核样品和环境样品中含量极低, 因此, 精确测定其同位素比值对236U在环境示踪、核应急、核取证以及核保障中的应用尤为重要. 本综述中, 作者总结了近年来痕量236U测定时样品前处理和检测分析技术的发展, 尤其着重于236U同位素比值的质谱检测技术的发展, 以及236U在核保障和环境中的示踪应用的研究进展. 最后, 对痕量236U检测和应用方面的研究提出展望. 相似文献