法定计量单位在分析化学领域中的正确应用

对分析化学领域中常见的法定计量单位与其对应的废弃形式进行了比较,指出了应用中常见的错误,并汇集了该领域中有关计量单位表述的正确范例     

光散射在高分子溶液和聚集态研究中的应用

本文较为详细的综述了光散射在聚合物研究中某些领域内的应用，并着重介绍了光散射在聚合物凝胶领域、聚合物稀溶液中、聚合物相行为领域以及聚合物加工领域中的发展历史和研究现状。     

河流重金属的分布与迁移转化研究进展

综述了河流重金属的分布和迁移转化研究进展,介绍了该领域的主要研究内容,指出了该领域中存在的问题和发展方向。     

2-甲基取代对吡咯啉-N-氧化物类自旋捕捉剂与超氧阴离子自由基加合物稳定性的影响

20世纪60年代末期出现的自旋捕捉技术已在多个学科领域中得到了普遍应用,特别是近年来该技术的生物体系活性氧自由基检测中获得了广泛的应用,极大地推动了生物自由基领域的研究。     

渔业领域中孔雀石绿检测的研究进展

介绍了国内外渔业领域中孔雀石绿的限量标准,对渔业领域中孔雀石绿的样品前处理和测定方法,包括色谱法、色谱-质谱联用法、酶联免疫法等进行了综述(引用文献71篇)。     

自由软件R及其在化学中的应用

论述了在科学研究领域中推广自由软件的重要性,并就其中的典型代表———统计处理软件R在化学领域中的应用列举了三个实例:分子动力学数据的统计分析、物理化学实验数据处理及碳纳米管分子模型的构建,给出了详细操作步骤。除文中列举的实例外,R还可被应用于化学模式识别、图形制作等领域,是化学工作者处理实际问题的一大利器。     

功能聚氨酯的研究进展

聚氨酯原材料来源广泛,是一类性能可高度调节的特殊高分子材料,已被广泛应用于诸多领域。本文介绍了高性能聚氨酯材料的发展状况和最新研究方向,综述了近年来聚氨酯材料在生物医学、导电、形状记忆及机械响应等领域的应用和研究进展,并讨论了聚氨酯在不同领域应用中存在的问题。最后,在此基础上展望了功能聚氨酯材料在不同领域的发展前景。     

试论中学化学德育目标的制定与实施

近年来,我国不少地区在认知领域和动作技能领域里相继制定了教学目标并实施目标教学,而在情感领域里,由于情感教育的育人功能和社会功能尚在探讨中,所以至今涉足甚少。     

国家自然科学基金委员会化学科学部2007年重点项目资助概况

2007年化学科学部在重点项目指南中公布了40个立项领域,受理重点项目申请117项,平均每个领域受理约3项.     

前言:生物无机探针与药物专刊

正作为无机化学与生物、医学领域的交叉前沿学科,生物无机化学在过去半个多世纪中得到了快速发展.特别是生物医学领域对分子水平机制、过程的需求日益增长,更加激发、促进了生物无机化学领域多个研究方向的拓展和创新.1978年以来,顺铂及后续铂类抗肿瘤药物在临床上的广泛使用,极大地激发了人们在无机药物化学领域     

Recent progress towards fluorinated copolymers for efficient photovoltaic applications

This review paper summarizes the recent progress of highly efficient copolymers with the fluorination strategy for photovoltaic applications. We first present a brief introduction of the fundamental principles of polymer solar cells, and then the functions of fluorine atoms on the polymer donor materials. Finally, we review the research progress of the reported copolymers by classification of the fluorinated acceptor units and donor units, respectively. The resulting structure-property correlations of these copolymers are also discussed which shall certainly facilitate widespread utilization of this strategy for constructing high-performance photovoltaic copolymers in the future.     

Synthesis and characterization of difunctional blue light-emitting molecules containing hole-transporting triphenylamino units

The synthesis of new difunctional (i.e., light-emitting and hole-transporting) fluorophore molecules, 2,2′-difuryl-4,4′-(N,N,N′,N′-tetraphenyl)diaminobiphenyl and 5,5′-bis(4-N,N′-diphenylaminophenyl)-2,2′-bifuryl, which contain hole-transporting triphenylamino units, are reported. These difunctional molecules emit intense blue photoluminescence and further reveal high HOMO energy values as well as high glass transition temperatures.     

Oxidative dehydrogenation of crotonaldehyde overK2HPMo12O40catalyst

Summary The oxidative dehydrogenation of crotonaldehyde to furan and maleic anhydride was carried out over K₂HPMo₁₂O₄₀catalyst. A positive effect of water vapor on furan formation is explained by ability of the catalyst to isomerize 2E- to 2Z-crotonaldehyde.</o:p>     

Cellulose Oligomers: Preparation from Cellulose Triacetate, Chemical Transformations and Reactions

Cellulose oligomers obtained by a new degradation method (pivaloylysis) are used as starting materials in organic synthesis. On the one hand these oligomers are functionalized to potent glycosyl donors, on the other hand several methods are shown to generate different types of hydroxy compounds (glycosyl acceptors). Glycosidation reactions performed with these two types of building blocks allow an access to linear products (unidisperse celluloses) as well as to new branched cellulose units.     

The Potential of Molybdenum Complexes Bearing Unsubstituted Heterodiatomic Group 15 Elements as Linkers in Supramolecular Chemistry

The reactions of tetrahedral molybdenum complexes bearing unsubstituted heterodiatomic Group 15 elements, [Cp₂Mo₂(CO)₄(μ,η²:η²‐PE)] (Cp=C₅H₅; E=As ( 1 ), Sb ( 2 )), with Cu^I halides afforded seven unprecedented neutral supramolecular assemblies. Depending on the Mo₂PE units and the Cu^I halide, the oligomers [?{Cp₂Mo₂(CO)₄}{μ₄,η²:η²:η²:η¹‐PE}?₄?{CuX}{Cu(μ‐X)}?₂] (E=As (X=Cl ( 3 ), Br ( 4 )); E=Sb (X=Cl ( 6 ), Br ( 7 ))) or the 1D coordination polymers [{Cp₂Mo₂(CO)₄}{μ₄,η²:η²:η¹:η¹‐PAs}{Cu(μ‐I)}]_n ( 5 ) and [{Cp₂Mo₂(CO)₄}{μ₄,η²:η²:η²:η¹‐PSb}₂{Cu(μ‐X)}₃]_n (X=I ( 8 ), Br ( 9 )) are accessible. These solid‐state aggregates are the first and only examples featuring the organometallic heterodiatomic Mo₂PE complexes 1 and 2 as linking moieties. DFT calculations demonstrate that complexes 1 and 2 present a unique class of mixed‐donor ligands coordinating to Cu^I centers via the P lone pair and the P?E σ‐bond, revealing an unprecedented coordination mode.     

The First Sodium Uranyl Chromate,Na4[(UO2)(CrO4)3]: Synthesis and Crystal Structure Determination

The first sodium uranyl chromate, Na₄[(UO₂)(CrO₄)₃], has been obtained by high‐temperature solid‐state reaction. The structure (triclinic, P1¯, Z = 2, a = 7.1548(3), b = 8.4420(3), c = 11.5102(5)Å, α = 80.203(1)°, β = 79.310(1)°, γ = 70.415(1)° V = 639.24(4)ų ) has been solved by direct methods and refined on the basis of F² for all unique reflections to R1 = 0.024 [calculated on the basis of 4374 unique observed reflections (‖F_o‖ 4σF)]. The structure is based on chains of composition [(UO₂)(CrO₄)₃] that are parallel to [1¯01]. The chains contain UrO₅ pentagonal bipyramids (Ur = Uranyl) that share all equatorial corners with CrO₄ tetrahedra. Cr(1)O₄ and Cr(3)O₄ tetrahedra bridge between two adjacent UrO₅ bipyramids, whereas Cr(2)O₄ tetrahedra share one corner with one UrO₅ bipyramid each. The [(UO₂)(CrO₄)₃] chains are planar and oriented parallel to (313). The Na⁺ cations provide linkage of the chains in the structure.     

Preparation of ‘cage molecule’ based polyazido core units for dendrimer synthesis

Core molecules based on benzene-, cubane-, and adamantane-polycarboxylates with peripheral polyazido substitution are reported. The first synthesis of 1,3-diazidoacetone and its conversion to the corresponding oxime, DNPH, and 2,2-dinitro derivatives is also reported.     

丝光沸石前驱体组装MCM-41介孔分子筛

MCM-41分子筛是具有单一孔径的长程有序介孔材料,由于孔壁是无定形结构,与微孔沸石晶体相比,水热稳定性较差,这使其在石油炼制和精细化工中的应用受到很大的限制.根据实验发现,如果将一些沸石的前驱结构单元体--即在形成完整的沸石结构前所形成的初级或次级结构单元引入介孔材料,使其转化为介孔孔壁,将会增加介孔材料的短程有序化程度,提高水热稳定性.     

Design,synthesis and magnetic properties of a ladderlike complex constructed by secondary building units

A secondary building unit (SBU), [Ni(2,2′-bipy)(5-npa)(H₂O)] _n [where 2,2′-bipy = 2,2′-bipyridine, 5-npa = 5-nitroisophthalic dianion], was synthesized as starting material of a polystep reaction. A ladderlike complex (LLC) Ni(II) coordination polymer, {[Ni(2,2′-bipy)(5-npa)(4,4′bipy)_0.5]·(H₂O)} _n , was constructed by polystep reaction using this SBU. In LLC, two SBUs were cross-linked by 4,4′-bipy [where 4,4′-bipy = 4,4′-bipyridine] forming a 1-D ladderlike structure. The magnetic properties of the LLC and SBU are discussed.