一种新型MAO改性的高活性铬基气相聚乙烯催化剂

制备了一种新型的CrO3／SiO2／MAO(／EtOAlEt2)乙烯聚合催化剂，在微机控制的自动评价装置上进行了乙烯气相聚合评价试验，研究了催化剂制备中有机铝化合物对催化剂的改性作用．结果表明，MAO作为还原剂可以明显提高催化剂的聚合活性，显著影响乙烯聚合反应动力学，得到的聚乙烯树脂融体流动速率较低．同时采用MAO和EtOAlEt2作为还原剂制备催化剂时，二者具有显著的协同效应，催化剂聚合活性高，临氢效应敏感高，树脂的融体流动速率高．     

Synthesis and magnetic properties of new binuclear Cu(II) complexes with tridentate azomethine ligands

New binuclear copper complexes of tridentate azomethine ligands with various combinations of N, O, and S donor centers were prepared by various procedures, including template synthesis. The magnetochemical data obtained for the range 2-300 K suggest the occurrence of antiferromagnetic coupling in most of these chelates. The only exception is the complex containing N-tosyl and N-ethyl donor fragments, in which the ferromagnetic exchange is observed.     

Synthesis and structures of iron(iii) complexes based on azo derivatives of 5-oxo- and 5-thioxopyrazole

New potentially tridentate ligands, viz., 3-methyl-1-phenyl-4-(quinolin-8-ylhydrazono)pyrazol-5(1H)-one and 3-methyl-1-phenyl-4-(quinolin-8-ylhydrazono)pyrazole-5(1H)-thione (LH), and their complexes with Fe^III were synthesized. The structures of the ligands and metal chelates (FeL₂A; A = ClO₄ or FeCl₄) were studied by ¹H NMR spectroscopy and magnetochemistry. The FeL₂A complex (A = FeCl₄) was investigated by X-ray diffraction. These low-spin complexes have pseudooctahedral structures with the N₄X₂ ligand environment (X = O or S).     

Magnetoactive binuclear copper(II) complexes based on β-aminovinylimines

β-Aminovinylimines containing bulky substituents at the donor nitrogen atoms and copper(II) chelates based on them were synthesized. The compounds were studied by single crystal and powder X-ray diffraction, EXAFS, NMR, EPR, and UV/Vis spectroscopy, and magnetochemistry. The complexes with halide bridges exhibit a ferromagnetic type of spin-spin interaction. The metal chelate containing a phenyl substituent in the γ-position of the aminovinylimino ligand absorbs atmospheric oxygen in a methylene dichloride solution, which gives rise to a dimer with oxygen bridges exhibiting an antiferromagnetic type of spin-spin interaction.     

Structure and properties of perimidine and its derivatives

The electronic absorption spectra, luminescence spectra, and vibrational spectra of perimidine and its derivatives have been studied. On the basis of the dipole moments and vibrational spectra, the conformations of 2-(o-hydroxyphenyl)perimidine and 2-(o-hydroxyphenyl)perimidine and 2-(o-methoxyphenyl)perimidine, which are stabilized by intramolecular hydrogen bonds, have been established. The electronic configurations of the perimidines in the ground and first excited states have been calculated by Hückel's MO method. The results have been compared with data on the reactivity and electronic absorption spectra of the perimidines.     

强激光装置中玻璃疵病在线检测的光学系统设计

介绍了一种用于玻璃疵病在线检测的近摄工作距成像光学系统,其光组结构形式采用了光阑后置的准远心结构形式,主要光学参量为f′=14 mm;在物像距为250 mm约束条件下,物方视场达到90 mm(对角线);F/number=3.56;光谱适应范围为400～800 nm,对应的空间分辨率为100 lp/mm时,调制传递函数大于0.29.