Regenerative soot as a source of broad band VUV light

Certain important and pertinent questions have been raised by E. Träbert in his comment on the paper [Eur. Phys. J. D 22, 189 (2003)] by one of us. We provide explanations as well as new and recent data using a calibrated monochromator on the existence of the main intercombination multiplet 233 nm which is the bone of contention. It is shown that there is no conflict with the established atomic physics in the regenerative sooting discharges; only the interpretations are at variance with those of the comment.Received: 30 July 2003, Published online: 30 September 2003PACS: 32.70.Fw Absolute and relative intensities - 34.50.Dy Interactions of atoms and molecules with surfaces; photon and electron emission; neutralization of ions - 34.80.Dp Atomic excitation and ionization by electron impact     

Influence of imidazole‐based acidity control of PEDOT:PSS on its electrical properties and environmental stability

Poly(3,4‐ethylenedioxythiophene):poly(styrenesulfonate) (PEDOT:PSS) has been studied for a wide range of applications due to its potential as a transparent electrode. Herein, the use of imidazole and its derivatives as a neutralizing additive for PEDOT:PSS dispersion and in‐depth studies of their effects in terms of electrical properties and stability is reported. Although the neutralization in general reduces the electrical conductivity of PEDOT:PSS, the conductivity after imidazole treatment (685.2 S cm^?1) is higher than that after treatment of other derivatives. Spectroscopic and thermoelectric studies show that the de‐doping effect resulted in the conductivity reduction. As a trade‐off of the conductivity reduction, greatly enhanced long‐term stability and noncorrosive characteristics are obtained after neutralization. The change in sheet resistance of imidazole‐treated PEDOT:PSS after 500 h under harsh conditions (85 °C and 85% humidity) is half that of the untreated samples, demonstrating the great enhancement of the stability. © 2016 Wiley Periodicals, Inc. J. Polym. Sci., Part B: Polym. Phys. 2016 , 54, 1530–1536     

基于移动中和界面电泳酸碱滴定的新原理及装置

基于移动中和界面(MNB)概念,研制了一种基于电泳酸碱滴定(EABT)的新装置.其核心技术是在电泳管中建立MNB,通过对电泳管中的MNB在一定时间内迁移距离的测定,推测酸或碱的浓度.EABT实验表明:HCl浓度的对数值与MNB移动距离存在线性关系.此关系可用于检测未知酸的浓度；不同酸碱指示剂对EABT方法没有明显影响,这能有效避免在容量分析法中不同指示剂对判定终点断滴所造成的误差；EABT具有良好的精密性和稳定性,日内差和日间差的RSD值分别小于1.6％和3.8％.     

Concise Synthesis of JN403, a Novel Nicotinic Acetylcholine Receptor α7 Selective Agonist

A three-step method for the synthesis of (S)-(1-aza-bicyclo[2.2.2]oct-3-yl)carbamic acid (S)-1-(2-fluorophenyl)ethyl ester HCl salt (12) was developed, starting from alcohol 3 and resulting in an overall yield of 50%. A key feature of the present study is the need to use a strong base such as n-butyllithium for neutralizing the HCl salt of 5 during the condensation of 4 with 5.     

ACID-BASE CHEMISTRY OF [PCl2N]3

An understanding of the chemistry of [¹⁵NPCl₂]₃ is very important because this trimer is the major precursor to phosphazene polymers. In order to understand its sensitivity toward reaction conditions, [¹⁵NPCl₂]₃ has been synthesized and characterized by modern spectral techniques. The goal of the study was to detect reactive impurities in the trimer, impurities that may account for the irreproducibility of the ring opening polymerization. Reactions of [¹⁵NPCl₂]₃ with various acids and bases were conducted and the products have been characterized by multinuclear and variable temperature NMR spectroscopy and mass spectrometry. Particular attention was given to understanding the reactivity at the ¹⁵N site toward acid and base reagents.     

Acid-base cooperativity of heterogeneous catalyst containing acidic framework and sterically hindered base for aldol condensation

A bifunctional heterogeneous catalyst containing two mutually incompatible acidic and basic sites,which exhibits cooperative catalytic behavior in the aldol condensation of acetone and various aldehydes,was synthesized by postgrafting of 1,5,7- triazabicyclo[4.4.0]dec-5-ene(TBD,a sterically hindered organic base) onto Al-MCM-41 molecular sieve.     

Interactions of Puerarin with Micelles: p<Emphasis Type="Italic">K</Emphasis><Subscript>a</Subscript> Shifts and Thermodynamics

In this paper, the effect of varying hydrophobic chain lengths on the acid-base equilibrium of an isoflavone, puerarin, in cationic micelles has been studied. The interaction of puerarin with three types of micelles of identical positively charged head groups and varying tail lengths, viz., DTAB, TTAB and CTAB, shows that there is a shift in the apparent pK _a in the direction that favors the displacement of the acid-base equilibrium of puerarin towards the base form. The relative location depth of puerarin in micelles is determined according to their dielectric values (D) taking into account that lower D values correspond to deeper location. It is evident that the reduction of polarity favors the deprotonation of puerarin. The isothermal titration calorimetry measurements show that the effect of puerarin on the thermodynamic properties of micellization is enhanced in the order CTAB>TTAB>DTAB and the results illustrate that puerarin has more affinity for micelles with greater chain length.     

奥扎格雷的晶体结构和酸碱性质

通过单晶X射线衍射测定了奥扎格雷的晶体结构. 晶体属正交晶系, 空间群为P212121, 晶胞参数为a=0.62522(6) nm, b=0.91897(8) nm, c=1.95789(18) nm, V=1.12492(18) nm3, Z=4. 通过紫外光谱和荧光光谱pH滴定研究了其基态和激发态酸碱性质, 测定了奥扎格雷的基态和激发态酸式电离常数. 结果表明奥扎格雷是一个pH诱导的荧光分子开关.     

Composition and plasticizing effect of poly(carboxylic acid) complexes with amino compounds

Poly(carboxylic acid)-dimethylalkylamine complexes were prepared and examined by various methods including infrared spectrometry and chemical titrations. FTIR measurements provided some of the most complete and detailed insights into the type and the stoichiometry of the acid-base complexes. A (1:1) stoichiometric complexation of the poly(carboxylic acid) with tertiary amines was involved in protic solvents. A threshold degree of complexation of 42% was obtained in such a macromolecular system. The equilibrium constant of the proton transfer reaction K was estimated to be independent on the alkyl chain length of the base reagent. Besides the formation of the acid-base complexes, a plasticizing effect of the amine derivatives was demonstrated by differential calorimetry. A T_g depression could be both attributed to the amine molecules linked to the polymer backbone via ionic bonds and to the free molecules dissolved within the free volume of the polymer.