冠醚共缩聚物的合成与性能（Ⅱ）

采用２，６－二羟甲基苯酚类化合物分别与单苯并冠醚（Ｂ１５ＣＳ、Ｂ１８Ｃ６）和Ｍ苯并冠醚（２Ｂ１８Ｃ６、２Ｂ２４Ｃ８、２Ｂ３０Ｃ１０）在酸催化下缩聚，合成了两个系列冠醚共缩聚物．这些聚合物Ｍ＝１２００—４５００，可溶于氯仿等溶剂，萃取性能和络合选择性均有所提高．作为树脂使用，动态吸附容量为０．０５—０．１５ｍｍｏｌ／ｇ，并有较好的色谱特性．     

Fabricating Dual-Atom Iron Catalysts for Efficient Oxygen Evolution Reaction: A Heteroatom Modulator Approach

Understanding the thermal aggregation behavior of metal atoms is important for the synthesis of supported metal clusters. Here, derived from a metal–organic framework encapsulating a trinuclear Fe^III₂Fe^II complex (denoted as Fe₃) within the channels, a well-defined nitrogen-doped carbon layer is fabricated as an ideal support for stabilizing the generated iron nanoclusters. Atomic replacement of Fe^II by other metal(II) ions (e.g., Zn^II/Co^II) via synthesizing isostructural trinuclear-complex precursors (Fe₂Zn/Fe₂Co), namely the “heteroatom modulator approach”, is inhibiting the aggregation of Fe atoms toward nanoclusters with formation of a stable iron dimer in an optimal metal–nitrogen moiety, clearly identified by direct transmission electron microscopy and X-ray absorption fine structure analysis. The supported iron dimer, serving as cooperative metal–metal site, acts as efficient oxygen evolution catalyst. Our findings offer an atomic insight to guide the future design of ultrasmall metal clusters bearing outstanding catalytic capabilities.     

2,5─哌嗪二酮与α,β─不饱和醛反应研究

综合运用了多种波谱学方法及化学手段确证并归属了2,5-哌嗪二酮与α,β-不饱和醛在超声波分散金属钾及双季铵盐作用下反应产物的立体化学与核磁共振信号,为研究这个反应提供了有用的信息.     

双波长β修正光度法测定金属络合物特征参数研究:硒（Ⅳ）－酸性铬蓝K显色体系

双波长β修正光度法测定金属络合物特征参数研究：硒（Ⅳ）－酸性铬蓝Ｋ显色体系郜洪文（淮北环境保护科学研究所安徽省淮北市２３５０００）关键词β－修正光度法特征参数硒ＡＣＢＫβ修正分析理论不同于其它双波长法［１－３］的原理，它能完全消除显色体系中过量络合剂...     

A simple synthesis of magnetic ammonium 12-molybdophosphate/graphene oxide nanocomposites for rapid separation of Cs<Superscript>+</Superscript> from water

A new nanoadsorbent A/Fe₃O₄/GO (AFG) is developed for eliminating Cs⁺ from water by anchoring Fe₃O₄ nanoparticles onto graphene oxide (GO/Fe₃O₄) and in situ controllable growing nanocrystal of ammonium 12-molybdophosphate (A) on the surface of GO/Fe₃O₄ with a simple procedure at room temperature. AFG shows a high adsorption capacity for Cs⁺ (Q_max?=?82.71 mg g^?1) and fast kinetics (>?88.83% elimination efficiency within only 1 min and reaches the end equilibrium in about 10 min). It presents good selectivity for Cs⁺ in a wide pH range (2.0–10). Furthermore, it can be recovered from water with easily magnetic separation.     

双波长β修正分光光度法测定锌配合物的配位比

双波长β修正光度法能消除络合反应中过量络合剂的干扰，从而计算出配合物真实吸光度。据此可推出络合剂有效络合分率及配位比的计算公式。本法操作简便，结果较准确。确定了锌（Ⅱ）与铬黑Ｔ、双硫腙、二甲酚橙和苯基荧光酮显色体系，其配位比分别为１：３、１：２、１：１、和１：１。     

ICP-AES法同时测定化妆品中的Hg、As、Pb

采用高压溶样弹，将样品用硝酸－过氧化氢或高氯酸－过氧化氢溶解后，用ＩＣＰ－ＡＥＳ法对汞砷铅连续测定。方法的回收率分别为８６．０％、９６．２％、９９．８％，变异系数分别为３．１７％、２．５１％、２．０１％。与原子吸收法比较，无显著差异。应用于市售化妆品检测，结果满意。     

冠醚苯酚共缩聚物的合成与性能

由２，６－二羟甲基－４－甲基（或磺酸基）苯酚分别和芳香族冠醚（Ｂ１５Ｃ５、Ｂ１８Ｃ６、ＤＢ１８Ｃ６、ＤＢ２４ｃ８等）在强酸催化剂下缩聚，合成了２个系列冠醚共缩聚物。它们的萃取能力和配合作用均优于相应的单冠醚，并可作为树脂吸附分离多种金属离子，作为配合剂测定钾、钠以及作为气相色谱固定液分离多种有机物。     

Complexations of tweezer molecule (2s, 8s)-bis(2-naphthoyl aminomethyl)-1,5,9-triazabicyclo[4,4,0]dec- 5-ene with organic anions

1H NMR studies have been made on the effects of complexation of tweezer molecule (2s, 8s)-bis(2-naphthoyl aminomethyl)-1,5,9-triazabicyclo[4,4,0] dec-5-ene chloride with the salts of p-nitrobenzoate, p-methoxybenzoate and (L)-N-acetyltryptophan. The stability constants of these complexes nave been determined in CDCl3. The results show that the tweezer molecule and aromatic carboxylates are self-associated by hydrogen bonding, electrostatic interaction and aromatic π-π stacking interaction, forming sandwich supramolecular complexes.     

插销式分子器件——可利用酸碱调控的超分子准轮烷

含有吗啉的富π电子苯醚链化合物与缺π电子联吡啶环玢CPQT通过分子间的π-π堆积作用形成超分子准轮烷结构。研究发现,随着温度的变化,该准轮烷结构的相对运动速度加快,弱相互作用减弱;并进一步发现,随着酸和碱的依次加入,该准轮烷结构呈现"开"与"关"的"插销式"器件性能。