Synergetic Spin Crossover and Fluorescence in One‐Dimensional Hybrid Complexes

Hybrid materials integrated with a variety of physical properties, such as spin crossover (SCO) and fluorescence, may show synergetic effects that find applications in many fields. Herein we demonstrate a promising post‐synthetic approach to achieve such materials by grafting fluorophores (1‐pyrenecarboxaldehyde and Rhodamine B) on one‐dimensional SCO Fe^II structures. The resulting hybrid materials display expected one‐step SCO behavior and fluorescent properties, in particular showing a coupling between the transition temperature of SCO and the temperature where the fluorescent intensity reverses. Consequently, synergetic effect between SCO and fluorescence is incorporated into materials despite different fluorophores. This study provides an effective strategy for the design and development of novel magnetic and optical materials.     

Design of TiO2@graphene nanosheets with rough surface and its reinforcement to polyarylene ether nitriles

The interfacial interaction is extremely important when dealing with filler‐reinforced polymer materials. Herein, in order to improve the interfacial interaction with the polyarylene ether nitriles (PEN) matrix, a three‐dimensional rough structure was designed. First, needle‐like TiO₂ nanocrystals were grown on each surface of the graphene. Morphology analysis proved that rough TiO₂ nanocrystals were coated on the graphene nanosheets. Then, TiO₂@graphene/PEN composites were fabricated to investigate the filler–matrix interaction. Thereafter, the different polymer chains could be interlocked by the TiO₂ “needles” when the rough TiO₂@graphene was embedded into the polymer resin. The surrounding PEN polymer chains (work as ropes) could tie to the “needles” (work as wood pile). That is to say, the effective polymer chain length was greatly lengthened, resulting in the improvement of interfacial interactions and mechanical properties. Most importantly, the morphology, mechanical and rheological tests of the composites also proved the improvement of interfacial interactions and mechanical properties. Copyright © 2015 John Wiley & Sons, Ltd.     

基于3,5-二((4'-羧基苄基)氧)苯甲酸和4'-(4-吡啶基)-2,2':6',2"-三联吡啶为混合配体的两个配合物的水热合成与晶体结构

在水热条件下,以3,5-二（（4''-羧基苄基）氧）苯甲酸（H3bcb）和4''-（4-吡啶基）-2,2''：6'',2"-三联吡啶（PYTPY）为混合配体构筑了2个过渡金属配合物[Co（H₂bcb）₂（PYTPY）]_n （1）和[Mn（H₂bcb）₂（PYTPY）]_n （2）,利用元素分析、红外光谱以及单晶X射线衍射表征其结构。分析表明配合物1和2为一维链状结构。此外,2个配合物展示了优良的热稳定性。磁化率的测试结果表明,配合物1和2在2 K和8 K以下时展示了反铁磁相互作用。     

氮掺杂纳米管包覆金属钴催化苯甲醇和苯胺一步N-烷基化反应

通过直接热解三聚氰胺、硝酸钴和葡萄糖混合物制备氮掺杂碳纳米管包覆金属钴催化剂(Co@NCNT).Co@NCNT具有较大的比表面积、均匀的氮分布以及包覆结构.在苯甲醇和苯胺一步法N-烷基化反应中Co@N CNT具有较高的催化活性,且循环4次反应活性没有明显的变化.控制实验和中毒实验表明金属Co和N对催化活性起着重要的作用,同时金属Co是中间产物N-苄叉苯胺加氢的主要活性位.     

离子淌度质谱结合荧光光谱法研究5-氟尿苷与铜锌超氧化物歧化酶的相互作用

分别利用离子淌度质谱和荧光光谱方法研究了5-氟尿苷（5-Furd）与铜锌超氧化物歧化酶（SOD1）的相互作用.离子淌度质谱研究结果表明,5-Furd能够稳定SOD1构型,减缓其碰撞诱导去折叠;外源荧光光谱方法进一步证明5-Furd可以抑制SOD1的聚集.利用荧光光谱研究了不同温度下5-Furd与SOD1的相互作用,阐明了二者的作用机制、结合常数和结合位点数,并根据热力学函数推断二者的作用力类型为典型的疏水作用.     

常见光谱技术在植物油品质检测中的应用

植物油品质检测技术中,以光谱技术为代表的更为简单方便、快速而不失准确性的无损检测技术为市场所需要。该文从植物油组成成分、市场售卖植物油掺假现状两方面对植物油的品质相关指标进行了介绍,着重介绍了红外光谱技术、拉曼光谱技术、荧光光谱技术、紫外光谱技术等不同光谱技术在植物油品质检测中的研究进展和应用现状,最后提出了光谱技术在植物油品质检测发展中的瓶颈,并对光谱技术在植物油品质检测中应用前景进行了展望。     

CO加氢制备低碳烯烃Fe基、Co基催化剂研究进展

CO加氢制备低碳烯烃是非石油路线获得烯烃的重要反应,其反应路线有直接法和间接法。直接法制备低碳烯烃具有反应路线短、能源利用率高、经济高效等优势。综述了近年来Fe基催化剂、Co基催化剂在CO直接制备低碳烯烃中的研究进展。分析认为：费托合成过程产物选择性遵循Anderson-Schulz-Flory（ASF）分布规律,助剂和载体的使用一定程度提高Fe基、Co基催化剂的低碳烯烃选择性。     

Naphthalimide-rhodamine based fluorescent probe for ratiometric sensing of cellular pH

The pH values of lysosomes in cancer cells is slightly lower than that in normal cells, which can be used to distinguish cancer cells from normal cells. According to this, a naphthalimide-rhodamine based fluorescent probe(hereafter referred to as RBN) with a pK_a of 4.20 was designed and synthesized for ratiometric sensing of cellular pH via fluorescence resonance energy transfer(FRET), which can respond to different pH precisely through ratiometric fluorescence intensity(Ⅰ_(577)/Ⅰ_(540)). RBN can be employed to distinguish cancer cells from normal cells on the basis of different fluorescent response, in particular, RBN showed excellent water solubility and low cell toxicity, all these are quite significant for potential application in cancer diagnose and therapy.     

高中化学“电负性”的项目式教学*——甲醛的危害与去除

电负性是高中化学选择性必修课程“物质结构与性质”模块的重要概念。本课例采用“项目式教学”的方式,在对“甲醛的危害与去除”的分析、讨论与实验过程中,加深对电负性概念的理解,同时尝试利用电负性分析与预测物质的化学性质,体会电负性概念的使用价值。     

基于3-羧基-5-氨基-1，2，4-三唑的Cd（Ⅱ）配合物的合成、晶体结构及催化性能

三唑类含能配合物在含能材料领域受到广泛关注。利用溶液法合成了一例含能配合物[Cd （Hatzc）₂（H₂O）]（LH1）,其中H₂atzc=3-羧基-5-氨基-1,2,4-三唑,并用X射线单晶衍射、元素分析、红外光谱等手段进行表征。单晶结构分析结果表明LH1属于单斜晶系,空间群为P2₁/n,呈一维链状结构,通过氢键相互作用形成三维超分子结构。LH1的爆速（D=10.4 km·s^-1）、爆压（p=55.2 GPa）、爆轰能量（16.51 kJ·g^-1）和密度（2.363 g·cm^-3）均优于大多数含能配合物。撞击感度（>40 J）和摩擦感度（>360 N）表明LH1对撞击和摩擦的敏感性较低。高氯酸铵（AP）的催化热分解结果表明,在LH1的催化作用下,AP的高温分解峰提前38℃,释放的热量在较短的时间增加0.46 kJ·g^-1,说明LH1对AP热分解具有良好的催化效果。