壳聚糖季铵化衍生物的吸湿性与保湿性

壳聚糖季铵化衍生物的吸湿性与保湿性许晨，卢灿辉（福建师范大学高分子研究所福州３５０００７）关键词壳聚糖季铵盐，壳聚糖衍生物，吸湿性，保湿性壳聚糖是从虾、蟹等废弃甲壳中提取得到的一种生物活性物质［１，２］，由于其特有的直链聚阳离子结构，成膜附于角蛋白与...     

二茂铁甲酰丙酮缩氨基硫脲金属配合物研究

将二茂铁甲酰丙酮与硫代氨基脲在水 -乙醇介质中进行缩合反应 ,得金属有机多齿配体C5H5Fe C5H4COCH2 C(CH3 ) =NNHCSNH2 (简记作 Fc TS) ,该配体分别与 d-过渡金属 [Cu( )、Co( )、Ni( )、Mn( ) ]、 B族金属 [Zn( )、Cd( ) ]及主族金属 [Pb( ) ]乙酸盐反应 ,合成了分子式为 (Fc TS) 2 M(CH3 COO) 2 的 7个新型配合物。经元素分析、IR、UV- Vis,1 H HMR、摩尔电导及固体电导的测定对配合物组成、结构、波谱性质和导电性能进行了研究。     

N—（3—二茂铁乙酰胺基）丙基吡咯聚合物修饰的葡萄糖电极的研究

于铂电极上修饰一层Ｎ－（３－二茂铁乙酰胺基）丙基吡咯聚合物膜，应用循环伏安法对聚合物的电化学性能进行研究，发现了Ｎ－位取代吡咯聚合物的电活性大大降低，聚合物中 二茂铁基团氧化还原性能稳定，制成酶电极后，在＋０．２Ｖ以葡萄糖有一明显的催化峰，而对抗坏血酸，尿酸则几乎没有呼应，该葡萄糖电极性能稳定，连续工作十天，响应值基本不变。     

Preparation and ~（183）W NMR Investigation of Iridium－containing Dawson Derivative

Ｐｒｅｐａｒａｔｉｏｎａｎｄ~（１８３）ＷＮＭＲＩｎｖｅｓｔｉｇａｔｉｏｎｏｆＩｒｉｄｉｕｍ－ｃｏｎｔａｉｎｉｎｇＤａｗｓｏｎＤｅｒｉｖａｔｉｖｅＬＩＵＨｕｉ－ｚｈａｎｇ;ＹＵＥＢｉｎ;ＬＩＭｉｎｇ－ｘｉｎｇ;ＣＨＥＮＺｈｉ－ｊｉａｎｇ;ＪＩＮＳｏｎ?..     

Synthesis of a ball-chain system C_(60) aza-derivative

Nitrenes generated by thermolysis of alkyl azides were found to add to C60 in chloroben-zene solvent. The product was isolated by means of silica gel chromatography and identified by field desorption mass spectroscopy and 13C NMR spectroscopy.     

富勒烯四甲氧基衍生物的合成与表征

富勒烯四甲氧基衍生物的合成与表征甘良兵，周胜，姜剑峰，黄春辉（北京大学化学与分子工程学院，北京，１００８７１）武轶，吕木坚，潘景歧（北京微量化学研究所）（北京大学分析测试中心）关键词Ｃ＿６０衍生物，甲氧基，四氮杂环十二烷富勒烯化学是目前人们研究的热门...     

Ammonium tetraphenylborate-naphthalene adsorbent for the preconcentration and trace determination of uranium in standard alloys and synthetic samples using 2-(5-bromo-2-pyridylazo)-5-diethylaminophenol by fourth-derivative spectrophotometry

A solid ion-pair material produced from ammonium tetraphenylborate (ATPB) and naphthalene has been used for the preconcentration of uranium from the large volume of its aqueous complex samples. Uranium reacts with 2-(5-bromo-2-pyridylazo)-5-diethylaminophenol (5-Br-PADAP) to form a water insoluble, coloured complex. This complex is quantitatively retained on the ATPB-naphthalene adsorbent filled in a column in the pH range 7.0–9.5 and at a flow rate of 2 ml/min. The solid mass from the column is dissolved with 5 ml of dimethylformamide (DMF) and uranium is determined by fourth-derivative spectrophotometry. The calibration curve is linear over the concentration range of 0.13–15.0 g of uranium in 5 ml of the final DMF solution. Seven replicate determinations of 6 g of uranium gave a mean peak height (peak-to-peak signal between 592 nm and 582 nm) of 1.02 with a relative standard deviation of 0.95%. The sensitivity is 0.8419 (d⁴A/d⁴)/(g ml^–1) found from the slope of the calibration curve. The interference of a large number of anions and cations on the estimation of uranium has been studied and the method applied for the determination of uranium in coal fly ash, Zr-base alloy and some synthetic samples corresponding to standard alloys.     

DTA-TG Study of the CaO-SiO2-H2O and CaO-Al2O3-SiO2-H2O Systems Under Hydrothermal Conditions

Simultaneous DTA-TG is an excellent technique for evaluating phases formed in hydrothermally treated CaO-SiO₂-H₂O and CaO-Al₂O₃-SiO₂-H₂O systems. Thermal analysis in combination with XRD and SEM, revealed that in the CaO-Al₂O₃-SiO₂-H₂O system the amount of hydrogarnet formed was the largest when gibbsite was used as the Al source, smallest for kaolin and intermediate for metakaolin. The endotherm peak temperature of the hydrogarnet dehydration endotherm was affected by the amount of hydrogarnet and the Si content of hydrogarnet. The thermal stability and structural order of 11 Å tobermorite were reduced with the incorporation of Al and, as a result, 11 Å tobermorite transformed into 9.3 Å tobermorite at lower temperatures while the transformation of the latter into beta-wollastonite required more energy. There exists a direct relationship between the 9.3 Å tobermorite and beta-wollastonite formation temperatures. Solid-state ²⁹Si and ²⁷Al MAS NMR data support these findings.     

Synthesis and Crystal Structure of the Derivative of β-elemene C_(20)H_(33)N·Cl_3CCOOH

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