Simple frequency measurement chain to 30 THz

We report harmonic mixing experiments between a 72 GHz mm-wave and 3.7 THz NH₃-laser radiation, as well as between 3.7 THz and the 10 m R(30) CO₂-laser line. For the former mixing a semiconductor diode is used, while for the higher frequencies an MIM tunnel diode served as the nonlinear element. Beat signals are of sufficient signal to noise ratio for precise optical frequency measurement.Visiting from National Institute of Metrology, Beijing, P. R. China     

二硫代草酰胺和二环己酮草酰二腙桥联的双核Cu(Ⅱ)-Cu(Ⅱ)配合物的合成和磁性Ⅰ.

在众多桥联配体中 ,二硫代草酰胺有独特的性质 ,其衍生物与各种金属形成单核或多核配合物已有较多报道 ,但以二硫代草酰胺 (H2 dto)作桥联基的双核铜配合物的合成报道仍较少[1 ] 。本文以 H2 dto作桥联基 ,乙二胺 (en)或二乙烯三胺 (dien)作端接配体 ,合成了两个新的双核配合物 [Cu2 (en) 2 (dto) ](Cl O4) 2 .3H2 O(1)和 [Cu2 (dien) 2 (dto) ](Cl O4) 2 .2 H2 O(2 ) ,另外用二环己酮草酰二腙 (BCO)作桥联基 ,以 2 ,2′-联吡啶作端接配体 ,合成了一个新型草酰胺类双核铜配合物 [Cu2 (bipy) 2 (BCO) (Cl O4) 2 ](Cl O4) 2 (3) ,研…     

Study of Methanol Conversion over Fe-Zn-Zr Catalyst

The methanol conversion over Fe-Zn-Zr catalyst was studied at 0.1 MPa and 280-360℃. The experimental results indicate that the main products of methanol conversion are methane and butane, and that other hydrocarbons are scarcely produced.All results show that propylene is most probably the olefin formed first in methanol conversion rather than ethene over Fe-Zn-Zr catalyst.Methane is formed from methoxy group,and C_4 is possibly yielded on the surface from propylene through binding with a methoxy group.     

含液晶二醇聚氨酯研究

合成了具有液晶性质的二元醇一对苯二甲酰二羟苯甲酸丁二醇酯（ＴＯＢＢ），这种二元醇单独或与端羟基聚了二烯（ＨＴＰＢ）混合后与二异氰酸酯反应生成几种聚氨酯，用ＩＲ，ＤＳＣ，偏光显微镜和ＷＡＸＤ对它们进行了表征，证明这种二元醇和聚氨酯都具有液晶性质。     

稀土-HEDTA-丝氨酸三元体系的pH电位法和荧光光谱研究

氨基多羧酸是镧、锕系元素促排剂,氨基酸是重要的生物配体。稀土-氨基多羧酸-氨基酸三元体系的研究对探索稀土在人体内代谢及其生物效应具有重要意义,其次,多元配位体系荧光研究亦是令人感兴趣的课题。有关稀土-氨基多羧酸-氨基酸三元体系研究不多,稀土-N-羟乙基乙二胺三乙酸(HEDTA)-丝氨酸(Ser)三元体系研究尚未见报导。本文用pH电位法和荧光光谱研究了稀土(除钷外镧系元素及钇)-HEDTA-Ser三元体系的配位作用,考察了铽配合物配体敏化荧光光谱特点。     

Investigation of the biological properties of Central Asian sea buckthorn growing in the province of Kansu (China)

The Central Asian sea buckthorn growing in the province of Kansu in China (Hippophaë rhamnoides L.,subsp. turkestanica Rousi) [1] has been studied for the presence of biochemical substances: amino acids, microelements, proteins, carbohydrates, lipids, free fatty acids, vitamins A and C, and flavonoids. A comparison of it with Chinese sea buckthorn in relation to a number of biochemical components has been made.Analytical and Experimental Center, Kansu Province, Lan-chow, China. Translated from Khimiya Prirodnykh Soedinenii, No. 1, pp. 135–137, January–February, 1991.     

全氟环氧丙烷在氟化钾催化下的阴离子聚合

研究了氟化钾催化下全氟环氧丙烷的自聚以及与全氟戊(或己)二酰氟的双官能团阴离子聚合。发现在常压力下氟化钾催化全氟环氧丙烷自聚的活性比文献报道的氟化铯催化活性小得多,但氟化钾催化全氟环氧丙烷和全氟戊(或己)二酰氟的双官能团聚合活性却比催化全氟环氧丙烷自聚的活性大。产物分离时两层中间的乳化层有催化作用,其结构可能为K~ ~-OCF_2R_fCF_2O~-K~ ,它还使全氟环氧丙烷在与全氟戊(或己)二酰氟的双官能团聚合中的自聚活性提高,类似于文献关于R_fO~-C_s~ 是活性催化剂的报道。对此催化作用提出解释。     

β—（酚酯基）乙基锗倍半氧化物的合成及对体外培养细胞的作用

β-羧基乙基锗倍半氧化物(即Ge-132)是一种无毒和具较强抗癌活性的有机锗化合物。为了进一步提高其抗癌活性。已对Ge-132进行了化学结构修饰。本文介绍8种未见报导的Ge-132衍生物,β-酚酯基乙基锗倍半氧化物的合成和体外培养细胞实验结果。