利用同步辐射进行X射线激发光学发光研究

本文介绍利用北京正负电子对撞机产生的同步辐射X光进行激发晶体(GGG:Nd~(3+),LaF_3:Nd~(3+))的光学发光研究的有关实验技术和设备。     

SHOCK COMPRESSION BEHAVIOR OF BROMOFORM

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Revising Space Groups from Simulated SHELXfcf Structure Factors. More Examples of Incorrect Space Groups, an Example of a Chemically-Incorrect Structure and the Special Case of Pgl to PRevisions

1 INTRODUCTION Although the incorrect assignment of the space groups of crystal structures has been addressed in a number of reports, instances of crystal structures refined in incorrect symmetry turn up even in the recent literature[1～4]. A simple method of space group revision makes use of the published atomic coordinates and temperature factors to simulate the diffraction intensities; the structure is then 搒olved?in the correct space group from the simulated hkl-F2 data[5] and an O…     

Synthesis and Crystal Structure of a Novel Complex [Ag(NIT3Py)_3]·(ClO_4)(H_2O)

1 INTRODUCTION Nitronyl nitroxide radicals (NITR), stable organic radicals, have played an important role in the design and synthesis of molecular magnetic materials[1, 2]. However, nitronyl nitroxide radicals are poor elec- tron-donor ligands and their coordination ability is limited. Recently, it has led to the development of functionalized nitronyl nitroxide radicals in which a strong coligand is incorporated. Due to the strong coordinate ability of nitrogen atom from pryidinyl ring,…     

β-FeSi2的高压研究

 对β-FeSi₂晶体进行了原位X射线衍射高压研究。利用同步辐射X射线衍射原位研究了β-FeSi₂的高压相演化，发现压力在4.3 GPa时出现相变，在25.8 GPa时相变完成。指标化结果表明：经高压处理后得到的产物具有四方结构，其晶格常数为：a=b=1.004 9 nm，c=0.339 4 nm。     

Adsorption and Reaction of CN ＋ O → OCN on Cu（100） Surface： A Density Functional Theory Study

1 INTRODUCTION The determination of structures of adsorbed cya- nide (CN) and cyanate (OCN) on transition metal surfaces is important for understanding their bon- ding and reactivity in catalysis and other surface phenomena[1～4]. During the past decade, the adsorp- tion of CN and CN-containing on transition metal surfaces has received a great deal of attention in both experimental[5～20] and theoretical[1～5, 13, 20～33] inves-tigations, and the previous work about the adsorp- tion of…     

Synthesis and Characterization of a 42-Membered Macrocyclic Compound C40H46N6O4 with [2＋2] Condensation

1 INTRODUCTION Macrocyclic[1～5] and macrobicyclic[6～11] com- pounds and their derivatives are great interesting ligand systems because they are good hosts for metal anions, neutral molecules and organic cation guests. Recently, many ligands in these fields have been rapidly developed and studied. Herein we will report the synthesis, crystal structure and characteri- zation of a novel 42-membered [2+2] macrocyclic compound obtained by the condensation of diethyl- lenetriamine with 4,4-d…     

Solvothermal Syntheses of (H_2en)_2Sn_2S_6·en and[(H_2hmda)_3(Hhmda)_2](Sn_2S_6)_2Using SnCl_4 and S_8 as Starting Materials

1 INTRODUCTION Since Bedard et al. reported microporous tin(IV) sulfides synthesized by hydrothermal method in the presence of organic amine in 1989[1, 2], a number of thiostannates have been synthesized using hydro- or solvothermal techniques with organic amines as tem- plates. The structures of the resulting tin(IV) sulfi- des are related to the types of organic amines. Two- dimensional polyanions of the types of [Sn3S7]2- and [Sn4S9]2-, which are denoted as SnS-1 and SnS-3, respe…     

A Novel Three-dimensional Inorganic Open-framework Constructed from [Mo_4O_(16)]_n ~(8n-) Chains Linked through Ag~+

1 INTRODUCTION even three-dimensional (3-D) extended solid frame- works in appropriate ways is a major challenge in The syntheses and characterizations of novel po- POMs chemistry. Based on the fact that POMs fra- lyoxometalates (POMs) have currently attached in- meworks with high electronic density can act as un- creasing interest owing to not only enormous variety usually effective ligands to coordinate second tran- of intriguing structural topologies, but also their fas- sition meta…