Ion-Pairing of Dyclonine with Dyes

Abstract

This potential for ion-pairing between dyclonine, a local anesthetic, and pharmaceutical dyes commonly used in liquid pharmaceutical formulations was examined. Occurrence of ion-pairing at a pH of 3 was confirmed by shift of the absorption maximum of all five sulfonate-containing dyes, and by measurements of octanol/water partition coefficient and surface tension. There was also an increase in the uptake of dyclonine by phosphatidylcholine liposomes in the presence of a dye (tartrazine) at pH 3 but not at pH 7, where the uncharged anesthetic is dominant.     

Chaos in Aso Dyes with Weigert's Effect

In the process of recording a hologram of linearly polarized plane waves in azo-dye-colored films, a chaotic time-dependent oscillation of the diffraction efficiency of the hologram was observed. The oscillation was detected under conditions of constant intensities of the hologram recording waves.     

Photochemical Activity of Merocyanine Dyes

Time-resolved photothermal responses of merocyanine dyes were used to estimate such parameters as the quenching rate constant of dye triplet states and dye capability of singlet oxygen generation, which are helpful in explanation of the dye photochemical activity. The results have shown that the high photostability of the salt form of merocyanine dyes and their resistance against reactive oxygen species as well as dye–oxygen interaction by triplet–triplet energy transfer make merocyanines efficient singlet oxygen generators in simple and complex systems.     

不对称防光晕染料的合成

合成了4个用于感绿X光片的不对称防光晕染料,其吸收波长在515～550nm之间,并利用紫外、红外、质谱、液相对其结构进行了鉴定。不对称染料的合成扩大了防光晕染料的选择范围,可减少染料用量。     

Fluorescence Efficiency of Laser Dyes

The fluorescence efficiency of xanthene dyes, oxazine dyes, and 7-aminocoumarins is discussed. Relations with the molecular structure are pointed out and dependence on solvent and temperature is explained. Several new fluorescence standards are suggested.     

高分子染料的合成与应用

高分子染料兼具染料和高聚物的优异特性,且具有不同于低分子染料的特殊染色性能,因此存在着巨大的研究与应用价值.较详细地阐述了高分子染料的合成方法及应用情况.     

近红外吸收多甲川染料

近年来我们合成了一系列近红外吸收多甲川染料,其中某些染料可以在红外照相、染料激光和光记录介质中使用。报道了这些染料的合成与应用。     

Stability of Dyes of Colour Photographic Materials

Factors affecting stability of black and white materials and means of controlling them have been known for many years. Factors affecting stability of colour materials require new and more detailed approach due to complex nature of dye images and of their formation. Artificial fading and incubation tests enable the manufacturers of colour materials to pinpoint and to control such effects. Some means of improving the permanency of colour photographic dye images are discussed and illustrated.     

桥链含苯并吡喃核的二碳菁染料合成研究

设计了一种新的合成路线，合成了桥链含苯并吡喃核的二碳菁染料。对染料合成的关键和染料性能特点作了分析和讨论。     

计算机直接制版版材及所用红外吸收剂

本文概述了计算机直接制版（ＣＴＰ）技术的特点、类型和发展背景。着重介绍了直接制版版材中热敏版的构成,并分类归纳了其中所用的红外吸收染料。     

染料插层类水滑石纳米复合材料的研究进展

从染料插层类水滑石纳米复合材料的制备方法、染料插层类水滑石粉体材料光热性能的改善及其薄膜/超薄膜体系的物理化学性质等方面,综述了染料插层类水滑石纳米复合材料的研究现状,并展望了此领域未来的发展。     

水溶性高分子染料的研究进展

随着新材料的开发和研究方法的改进,水溶性高分子染料有了较大发展。本文介绍了水溶性高分子染料的发展历史,对其三种结构(端位型、主链型、侧链型)的合成方法进行归纳。根据水溶性高分子染料的不同功能,对其近几年的应用进行综述,提出了当前研究应用中存在的问题,并对水溶性高分子染料未来发展进行了展望。     

偏光片中的染料剖析

由于偏光片独具的光学特性,又是一种薄型的片状材料,便于加工使用,因而在生活用品、工业交通、国防和尖端科学技术中都有广泛的应用。本文的工作是采用波谱技术对国外的优质偏光片进行染料结构的剖析研究,结合相关资料查阅,从而掌握国际上优质偏光片所应用染料的结构信息,了解此项技术的发展动态。     

Electronic and Molecular Structures of Dyes VI: Estimation of Redox Potentials and Excitation Energies of Cyanine Dyes by Means of HMO Calculation with Regard to Steric Effects.

The correlation has been examined between redox potentials and the electronic energy levels of cyanine dyes, which has been calculated by the HMO method. The agreement between them was quite good for all cyanine dyes studied except monomethine ones. The examination of the discrepancy with monmethine cyanines has led to the following conclusion. In the case of 2,2'-quinocyanine, the stabilization of the lowest vacant electronic energy level and the unstabilization of the highest occupied one have been found to come from the nonplanarity of the dye molecule due to its steric hindrance. In the case of thiacyanine, it has been found that the unstabilization of the lowest vacant level and the stabilization of the highest occupied one arise from the intramolecular interaction between two sulphur atomic orbitals of the dye molecule. The steric effects for quinocyanine mentioned above make the observed reduction potential positive, the oxidation potential negative, and the excitation energy small with respect to the calculated ones: with thiacyanine they make the reduction potential negative, the oxidation one positive, and the excitation energy large. With regard to the above-mentioned steric effects in monomethine cyanine dyes, the HMO method was applied to the estimation of redox potentials and excitation energies of well-known simple cyanine dyes as well as those of unknown cyanine dyes with long polymethine chains.     

Spectral Sensitization with Ten Cyanine Dyes I. Response at Microsecond Exposure Times

Ten cyanine dyes, adsorbed to cubic- and octahedral-grain bromide emulsions, exhibit unexpected losses in spectral sensitization at microsecond exposure times. These losses are attributed to high-intensity reciprocity failure of secondstage sensillzallon processes.     

Adsorption of Sensitizing Dyes at Definite Crystal Faces

Adsorption isotherms of five different sensitizing dyes have been obtained at monodisperse AgBr grains in a wide p_Ag region separately at (100) and (111) crystal faces. From the experimental data, values of the maximum surface coverage and of the heat of adsorption were calculated. Some of the adsorption isotherms deviated considerably from the ideal Langmuir type either by an unusually steep initial slope or by an inflexion preceding the Langmuir branch. Geometric-statistical considerations led to on interpretation of the observed deviations which are caused either by a competition of two different geometric orientations (e.g. flat/edge-on) or by a competition of two separately adsorbed components of the system (e.g. dye/Ag ions).