O-2＇-羟丙基三甲基氯化铵壳聚糖的合成与表征

通过苯甲醛与壳聚糖反应形成Ｓｃｈｉｆｆ碱,对Ｃ２上氨基进行保护,经过２,３－环氧丙基三甲基氯化铵与Ｓｃｈｉｆｆ碱壳聚糖中间体反应后再保护,合成了Ｏ上取代的委铵盐壳聚糖,其结构经ＩＲ,＾１ＨＮＭＲ及＾１３ＣＮＭＲ分析表征。实验表明Ｏ上取代的季铵盐壳聚糖可溶于Ｈ２Ｏ及甲醇、乙醇、乙二醇等有机溶剂中。     

新的离子型光敏聚酰亚胺

合成了新的复合光敏聚酰胺酸季铵盐，研究了光敏剂、交联剂以及化学结构对感光度的影响，并考察了其热稳定性。结果表明以3，3′，4，4′－联苯四酸二酐－间苯二胺为主链的聚酰胺酸合成的光敏聚酰胺酸季铵盐有较高的感光度，光敏剂米氏酮的含量在3－5％，交联剂2，6－双（4－叠氨苄基）－4－甲基环己酮的含量在8－10％为宜；光敏性叔胺二甲氨基乙醇肉桂叉乙酸酯的含量不可超过8％；由这种复合季铵盐合成的新的光敏聚酰胺酸盐在较低的温度200℃以下就可以完全酰亚胺化，但接近550℃才达到理论失重量。     

新型聚苯胺共聚物季铵盐的合成与性能研究

以邻硝基苯甲酸和苯胺为原料,经6步反应合成了一种新型的聚[苯胺-N-(2-氯乙基)-2-氨基苯甲酰胺]共聚物季铵盐(6),其结构和性能经UV-Vis,IR,X-射线衍射和离子交换容量表征。结果表明,季铵化成盐后,6的IR和UV吸收带发生了明显蓝移;6具有较好的共轭性,可能呈导电性;6呈非晶态结构,能溶于甲醇和DMF等极性溶剂,具有一定的离子交换能力。     

α—和β—[SiW9Ti3O40]^1^0^—的合成及其钨—183核磁共振表征

本文报道了α－和β－［ＳｉＷ９Ｔｉ３Ｏ４０］＾１＾０＾－杂多阴离子的钾盐，四甲基铵盐的合成及其１８３ＷＮＭＲ表征，１８３ＷＮＭＲ谱中有两个峰，相对强度为２：１，表明其阴离子分别为Ａ型α－和β－Ｋｅｇｇｉｎ结构，即三个ＴｉＯ６八面体是角顶共用，合成化合物催化ＰｈＩＯ环氧化烯烃的性质。     

蒽醌类亲脂性阳离子的合成及抗癌活性

合成了7个大黄素季铵盐、2个芦荟大黄素季铵盐、1个水溶性大黄素季铵盐和1个α-萘酚醌苯基甲烷季铵盐化合物,并测试了其抗癌活性.含有1条长碳链的大黄素季铵盐的抗癌活性很低,但是含有2条长碳链的大黄素和芦荟大黄素季铵盐的抗癌活性较好.用亲水性的长链替代季铵盐中亲脂性的长碳链会导致大黄素季铵盐失去抗癌活性.α-萘酚醌苯基甲烷季铵盐显示了中等的抗癌活性,表明在具有电子传递能力的分子中引入亲脂性的长碳链季铵盐可以增加其抗癌活性.     

β-/γ-环糊精与Gemini草酸酯季铵盐的相互作用

本文对新合成的双子草酸酯季铵盐表面活性剂以表面张力法测定了25～45℃范围内的临界胶束浓度(0.6698～0.6099mmol·L-1),并计算了胶束形成的相关热力学参数ΔGm0、ΔHm0、ΔSm0.对其与β-,γ-环糊精(β-,γ-CD)的包结作用进行了研究.β-环糊精与双子草酸酯季铵盐表面活性剂的主客体包结物包结比主要为2:1.实验结果表明,环糊精对双子草酸酯季铵盐的胶束化有显著影响.由于双子草酸酯季铵盐的水链被环糊精的空腔包裹,削弱了其胶束生成的能力,使溶液的表面张力随环糊精浓度的增加而大大增加.     

相转移催化剂A-1催化合成扁桃酸

分子结构为（C8－10H17－21）3N^ CH3C^-的季铵盐（A－1）经实验证明是合成扁桃酸的一种优良的相转移催化剂,其催化活性要优于其它短碳链的季锭盐和聚乙二醇。使用季铵盐A－1,扁桃酸收率可达92％,季铵盐A－1在分离过程中不乳化,使产物易于分离纯化,还可循环使用,且产率较高。     

含有磺酸和羧酸基团的聚氨酯离聚物的研究

以聚四氢呋喃醚二醇和４，４＇－二苯甲烷二异氰酸酯、二羟甲基丙酸合成了含羧酸基团的聚氨酯，再通过ＮａＨ和丙磺酸内酯接上不同含量的丙磺酸基团。通过ＤＳＣ、动态粘弹谱、应力－应变测试等手段对其形态结构和力学性能进行了研究。结果表明，－ＳＯ３＾－Ｎａ＾＋的引入对ＰＵ离聚物的形态结构有较大的影响。－ＳＯ３＾－含量越高，相分离程度越大；拉伸强度先随－ＳＯ３＾－Ｎａ＾＋含量的增加达到最大值，尔后又下降。材料的亲     

钌取代的钨锗和钨硼杂多合物的合成与表征

本文合成了Ｋｅｇｇｉｎ结构的［ＧｅＷ１１Ｏ３９（Ｒｕ·ＯＨ２）］＾５－和［ＢＷ１１Ｏ３９（Ｒｕ·ＯＨ２）］＾６－杂多阴离子的四丁基铵盐。通过紫上－可见、红外光谱、核太共振、顺磁共振和循环伏安法对上述化合物进行了表征。结果表明Ｒｕ（Ⅲ）处于一个八面体弱场中，Ｒｕ（Ⅲ）的顺磁性和核四级矩对＾１８３Ｗ的化学位移和强度有明显的影响，其电化学还原与Ｗ（Ⅳ→Ⅴ）相关。Ｒｕ（Ⅲ）填充了缺位杂多阴离子的空位，但仍     

掺杂条件对聚苯胺膜导电性能影响的研究

采用对甲基苯磺酸和磺基水杨酸作掺杂剂，对聚苯胺自支撑膜进行了掺杂研究，考查了掺杂时间，温度以及掺杂溶液浓度对其导电性的影响，并用红外光谱及显色反应对掺杂产物进行了表征。结果表明，掺杂温度对聚苯胺膜电导率的影响较大，通过控制温度，可以制备出电导率达盐酸掺杂水平的导电膜，即－１０＾３Ｓ．ｍ＾－１，且具有良好的环境稳定性，在空气中放置一年，其电导率基本保持不变。     

Preparation and functional characterization of BiFeO3 ceramics: A comparative study of the dielectric properties

In the present study, the electrical properties of BiFeO₃ ceramic specimens prepared by solid-state sintering method by using two thermal treatment strategies are comparatively investigated. The room temperature XRD pattern shows perovskite single-phase, in the limit of XRD accuracy, for BiFeO₃ ceramic prepared by single-step method. For two-step sintering method sample small amounts of secondary Bi₂Fe₄O₉ phases were identified. The ceramics show a non-homogeneous microstructure, consisting of ceramic grains with irregular morphology and interconnected porosity mainly in the grain boundary regions in the case of two-step sintering sample. The most interesting feature is the conduction anomaly observed on the conductivity in the low-frequency range close to dc-conductivity. The Arrhenius plot of the dc-conductivity determined at the lowest frequency vs. 1/T shows two distinct linear regions separated by the mentioned temperature range of (189–244) K, for which the dc conductivity could not be determined from the present impedance spectroscopy data only. It is clear that in the mentioned temperature range (for both samples), a conduction anomaly takes place.     

Cu3BiS3: Two-Dimensional Coordination Induces Out-of-Plane Phonon Scattering Enabling Ultralow Thermal Conductivity

The discovery of compounds with low thermal conductivity and the understanding of their microscopic mechanisms are of great challenges and scientific significance. Herein, we report a unique ternary sulfide compound, Cu₃BiS₃, in which all Cu atoms are coordinated within a two-dimensional [CuS₃] triangle plane. This local coordination leads to efficient out-of-plane phonon scattering and an ultralow thermal conductivity. Through DFT phonon spectrum calculations and analyses, we reveal that the lowest vibration frequency decreases from 2 THz for high-dimensional [CuS₄] tetrahedral coordinated Cu atoms in CuBiS₂ (CN=4, with an average Cu−S bond length of 2.328 Å) to 1.5 THz for low-dimensional [CuS₃] triangular coordinated Cu atoms in Cu₃BiS₃ (CN=3, with a shorter Cu−S bond length of 2.285 Å). This is due to the out-of-plane thermal vibration of the Cu atoms in the latter. Consequently,Cu₃BiS₃ exhibits one of the lowest values of κ_lat (0.32 W/m K) among its peer, with a 36 % reduction compared to CuBiS₂ (0.50 W/m K). This groundbreaking discovery highlights the significant role of 2D local coordination in reducing thermal conductivity through characteristic out-of-plane phonon scattering, while also contributing to a large Grüneisen parameter (2.06) in Cu₃BiS₃.     

聚合物表面金属化的研究：Ⅰ.导电性能的研究

用还原法在ＮａＢＨ４溶液中制备了一系列表面金属化的聚丙烯腈薄膜。考察了含两种不同阴离子的铁金属盐和铁钴金属盐的ＰＡＮ还原后膜表面的导电性能。讨论了ＰＡＮ膜表面电导率与各种离子的结构关系。初步研究了还原剂浓度、还原时间、金属离子浓度及还原温度对ＰＡＮ膜表面导电性能的影响。     

Factors Affecting the Phase-Inversion Temperature of Fatty Alcohol Ethoxylates

Factors that affect the phase-inversion temperature (PIT) based on nonionic surfactant fatty alcohol ethoxylates were investigated. Phase-inversion process was continuously monitored by determining changes in conductivity with temperature. The influences of oil-to-water ratio, emulsifier concentration, emulsifier mixing ratio, sodium chloride, and oil types on the PIT of emulsions were investigated. Results showed that the PIT of the emulsions declined with increased oil-to-water ratio. Emulsifier concentration significantly affected the PIT temperature. High sodium chloride content suppressed phase inversion. A lower Brij72-to-Brij721 ratio corresponded to higher PIT. Different oils required different HLB numbers in the phase-inversion process.     

Synthesis,thermal and electrical studies on solvated oxovanadium(IV) complexes with schiff bases derived from aromatic diamines and 2-hydroxy-1-naphthaldehyde

Summary Solvated oxovanadium(IV) complexes of Schiff bases derived from aromatic diamines and 2-hydroxy-1-naphthaldehyde have been prepared from ethanolic medium. The elemental analyses reveal that the complexes have the ratio 1:1, 2:2 and 1:2 (ligand:metal) composition which are nonelectrolyte inDMF. The coordination number six (octahedral geometry) is proposed for the complexes prepared. This is based on the results of IR, electronic and EPR spectra. TGA as well as DTA studies and the electrical properties and (I–V) characteristics for the metal complexes were investigated.

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Synthese und thermische bzw. elektrochemische Untersuchungen an solvatisierten Oxovanadium(IV)-Komplexen mit Schiff-Basen aus aromatischen Diaminen und 2-Hydroxy-1-naphthaldehyd

Zusammenfassung Die im Titel genannten Komplexe wurden in ethanolischem Medium hergestellt. Sie sind inDMF Nichtelektrolyte und haben laut Elementaranalyse die Zusammensetzung Ligand:Metall=1:1, 2:2 und 1:2. Basierend auf IR-, UV- und EPR-Spektren wird die Koordinationszahl 6 (oktahedrale Geometrie) vorgeschlagen. Es wurden TGA- und DTA-Studien durchgeführt und das elektrochemische Verhalten der Metallkomplexe untersucht.

     

微波场溶液电导率的现场测定(英文)

现场测定了溶液在微波场和非微波场中的电导率～温度函数,结果表明在微波场与非微波场中溶液的电导率(Lw)随温度的变化可分别用方程Lw=a′+b′T+c′T2和Ln=a+bT+cT2表述,类似于非微波场中的溶液电导率,而Lw和Ln两者的关系则可表示为lnLw=A+BLn+CL2n。以上a,b,c,…A,B,C等皆为经验系数。     

Cooperative Proton and Li-ion Conduction in a 2D-Layered MOF via Mechanical Insertion of Lithium Halides

Ionic conduction in highly designable and porous metal–organic frameworks has been explored through the introduction of various ionic species (H⁺, OH⁻, Li⁺, etc.) using post-synthetic modification such as acid, salt, or ionic liquid incorporation. Here, we report on high ionic conductivity (σ>10⁻² S cm⁻¹) in a two-dimensionally (2D)-layered Ti-dobdc (Ti₂(Hdobdc)₂(H₂dobdc), H₄dobdc: 2,5-dihydroxyterephthalic acid) via LiX (X=Cl, Br, I) intercalation using mechanical mixing. The anionic species in lithium halide strongly affect the ionic conductivity and durability of conductivity. Solid-state pulsed-field gradient nuclear magnetic resonance (PFG NMR ) verified the high mobility of H⁺ and Li⁺ ions in the temperature range of 300–400 K. In particular, the insertion of Li salts improved the H⁺ mobility above 373 K owing to strong binding with H₂O. Furthermore, the continuous increase in Li⁺ mobility with temperature contributed to the retention of the overall high ionic conductivity at high temperatures.     

Quantum Chemistry Studies on the Difference of Structures and Electronic Properties of Polyacene,Polypyridinopyridine and Paracyanogen

IntroductionThestudiesonconductivepo1ymershavebeenofmuchinterestsbothinex-perimentalworkandtheorysincetheresultsonconductivityofdopedpolyacety-lenewerereported.Itwasreportedthatthehighestconductivityofdopedpoly-acetylenereachedupto1O5s/cmandjustfellintherangeofmetalconduction[1].Somepeoplehaveputforwardone-dimension(1D)graphitematerialfamilytobeconsistedofcondensedaromaticrings.Therearetwbkindsofimportantmolecularskeletonsforms,oneisanextended.versionfrompolyacene.Thepolyacenecanbeobtaintedb…     

掺杂剂锂链间迁移在聚乙炔纵向导电机制中的作用

聚乙炔(PA)的电导率X(Ω~(-1).cm~(-1))经掺杂可以在十二个数量级内变化。PA导电机理与一般的无机导体或半导体不同,PA通过荷电孤子与中性孤子之间的电子跃迁导电,而掺杂剂参与可增大这种跃迁的几率。掺杂剂与PA之间存在着相互作用,并由此而引起PA多种性质的变化。深入研究PA链间通过掺杂原子(或分子)进行的相互作用以及电荷传递过程,对于进一步揭示PA的垂直电导率产生的本质有着十分重要的意义。