N，N，N＇，N＇－四苄基取代方块菁染料LB膜研究

Ｎ，Ｎ，Ｎ＇，Ｎ＇－四苄基取代方块菁染料ＬＢ膜研究李津如，李宝芳，范长宇，李兴长（中国科学院感光化学研究所，北京１００１０１）关键词方块菁染料，聚集体，ＬＢ膜，各向异性方块菁染料在有机光导材料［１，２］、有机太阳能存储［２，３］、光记录［４］、有机光...     

阴离子碳菁染料的合成与聚集动力学研究

自从１９３８年，Ｓｃｈｅｉｂｅ［１］发现了菁染料聚集体中的能量传递现象，人们对菁染料的聚集行为展开了大量的研究［２，３］．由于菁染料聚集体对乳剂具有特殊的增感作用，人们主要研究聚集体在乳剂中的增感机理［４，５］以及菁染料聚集的溶剂效应与浓度效应［６］...     

多聚磷酸作用下由硫代氨基脲合成1,3,4-二唑

多聚磷酸作用下由硫代氨基脲合成１，３，４┐二唑任仲皎＊李云李建有（中南民族学院化学系，武汉４３００７４）１，３，４－二唑化合物是重要的光敏物质，它们可作荧光剂［１］、激光染料［２］、闪烁体［３］，尤其作为感光高分子材料应用于电发光仪器［４～６］。...     

一种偶氮染料金属螯合物薄膜的光学特性研究

偶氮染料是一类广泛应用的纺织用有机染料［１］,近年来随着光电子技术的发展,偶氮染料作为非线性光学材料［２］和光信息记录介质［３］引起人们极大的兴趣．偶氮染料具有对光吸收大,容易制备,在有机溶剂中具有较高的溶解度而适用于湿法涂布等优点,可以作为可录光盘（ＣＤＲ）的记录介质．日本的三菱化学株式会社［４,５］,三井东压化学株式会社［６］和美国柯达公司［７,８］等在这方面发表了一系列专利．通过对染料分子结构的修饰可获得各种吸收波长不同的染料,与各种发射波长不同的半导体激光器相匹配．一些偶氮染料可与金属…     

2，6－二甲基硝基苯合成方法的改进

２，６－二甲基硝基苯合成方法的改进袁荣鑫，张鸣（徐州医学院化学研教室徐州２２１００２）２，６－二甲基硝基苯是药物、染料的重要中间体，一般是以间二甲苯为原料，碳化［１］、硝化［２］，再经水蒸气蒸馏得产物。文献报道双磺化采用２２％发烟硫酸［３］，我们对比...     

染料掺杂有机改性硅酸盐的制备与光谱特性

１９８８年Ｐａｖｌｏｐｏｕｌｏｓ等人发现１,３,５,７四甲基吡咯亚甲基ＢＦ２化合物是一个性能优良的激光染料［１］．它的荧光量子效率高,激光效率比香豆素５４０Ａ高１０％,并具有低的三重态吸收和高的光化学稳定性．因此,在染料激光、生物荧光探针、光动力疗法等方面都有潜在的应用背景［２～４］．溶胶凝胶法是目前研究最多,应用最广低温制备玻璃的方法．广泛地运用于制备各种光学材料、陶瓷、薄膜等功能材料．但运用传统的溶胶凝胶法制备的样品易在热处理过程中脆裂,力学性能和柔韧性均很差,不能直接抛光达到所需的光…     

三氮吲哚利嗪对氯化银乳剂光谱增感性能的影响

三氮吲哚利嗪（ＴＡＩ）是一种常用的银盐感光材料的稳定剂，许多研究表明ＴＡＩ在化学增感或光谱增感乳剂中具有超增感作用［１，２］，另有报道，它与光谱增感染料两者之间的添加次序对增感效果有很大的影响［１，６，７］．在Ｔａｎｉ的研究中［１］，在光谱增感后的乳...     

先进复合材料与力学

先进复合材料有着与常规材料完全不同的材料的概念,它本质上是结构物＾［１￣３］。这种需要用新的观念来应用和发展先进复合材料＾［４,５］,力不分析在这里起着十分重要的作用。     

四甲基氯化铵相转移催化合成N,N┐二乙基苯胺

四甲基氯化铵相转移催化合成Ｎ，Ｎ┐二乙基苯胺田庆伟（大连铁道学院应用化学系，大连１１６０２８）Ｎ，Ｎ－二乙基苯胺是制备染料、药物和彩色显影剂的重要中间体，用途广泛［１］。传统的合成方法是在高温、加压下进行［２］，近年来，在常压下采用相转移催化的方法受...     

菁染料光稳定性研究进展

菁染料的研究已有一百多年的历史,其最重要的用途是作为光谱增感剂应用于卤化银照相乳剂中,扩大卤化银微粒的感光范围并提高感光度［１］．近年来又开展了在其它领域的应用研究,发现它的许多特殊用途．开拓新的光存储介质是发展光盘存储技术的关键和核心,有机材料作为...     

High speed three-component photoinitiating systems composed of cyanine dyes borate salt and heteroaromatic thiols

Three heteroaromatic thiols (2-mercaptobenzothiazole, 2-mercaptobenzoxazole and 2-mercaptobenzimidazole) were investigated in regard to their abilities as a co-initiator in free radical polymerization induced by cyanine dye/borate salt photoinitiating system. The kinetic results shown that the new three-component photoinitiating systems are more effective than two-component ones. The mechanism of photochemical and chemical processes occurring during the irradiation of the three-component initiators was proposed on the basis of the laser flash photolysis. The addition to the cyanine dye borate salt of a second co-initiator (thiol) results in the generation besides butyl radical the second free radical which can start the polymerization chain reaction.     

氰苄基方酸菁染料的合成及光谱性能

以2,3,3-三甲基-3H-吲哚为原料,合成了N-氰基取代吲哚啉季铵盐。采用一步法将方酸与吲哚啉季铵盐缩合制得对称氰苄基方酸菁染料,采用重结晶法对合成染料进行分离提纯,利用核磁共振氢谱、红外光谱、质谱等对染料进行了结构表征。考了查染料的光谱性能。     

Oxygen mediated and wavelength tunable cationic photopolymerization reactions under air and low intensity: A new concept

A new concept which allows efficient cationic photopolymerization reactions under air, at any excitation wavelength in the UV–visible range and under low light intensities (conventional Xe lamp and/or laser diodes) is presented. It is based on the use of a versatile free radical promoted cationic process for the photoinitiation step which only requires a radical source, a silane and an usual iodonium salt and takes advantage of the presence of oxygen. The tunable character of the absorption is connected with the choice of the radical source. The oxygen enhancement is due to the particular role played by the silane. In every case, the silylium cation is the most efficient structure for the cationic ring opening reaction. Examples of the performance achieved (e.g. a conversion close to 100%) with such systems over the 390–580 nm range using various irradiation devices is shown and discussed.     

Applicability of hemicyanine phenyltrialkylborate salts as free‐radical photoinitiators in the visible‐light polymerization of acrylate

The photoinitiation ability of photoredox pairs composed of a hemicyanine dye cation and different borate anions for the radical polymerization of 2‐ethyl‐2‐(hydroxymethyl)‐1,3‐propanediol triacrylate was investigated. In such a system, the excited dye chromophore is reduced by different tetraorganylborate anions. Upon irradiation at 488 nm, reductive carbon–boron bond cleavage occurs, producing reactive radicals, which start the chain reaction. The efficiency of bond‐breaking processes was found to be dependent on the nature of both the acceptors and the donors. The experimental results show that the photoinitiating ability of the tested photoredox pairs were controlled by both the driving force of the electron‐transfer process between the electron donor and the electron acceptor and the reactivity of the free radical that resulted from the secondary reactions occurring after the photoinduced electron‐transfer process. Using the nanosecond flash photolysis method, we studied the spectral and kinetic characteristics of the triplet state of cyanine dye and determined the rate constants of the triplet quenching by phenyltrialkylborate salts. The results obtained show that the tetramethylammonium phenyl‐tri‐n‐butylborate (TB7) has a faster electron‐transfer rate than the tetramethylammonium n‐butyltriphenylborate (TB2) salt, which bore only one butyl group attached to the boron. The relative initiator efficiency of the triphenylbutylborate salts, as compared to the corresponding phenyltrialkylborate salts with a common chromophore, was determined. © 2011 Wiley Periodicals, Inc. J Appl Polym Sci, 2012     

Cyclic acetals as the second co-initiators in three-component photoinitiating systems

Cyclic acetals were used as a second co-initiator in three-component photoinitiating systems. The mixtures of cyanine dye borate ion salt and cyclic acetals were used to initiate the visible light polymerization of triacrylate monomer (TMPTA). The kinetics of polymerization was recorded by differential scanning calorimetry (DSC). The results showed that the addition of cyclic acetals increases the rate of polymerization (R _p).     

High performance of the linked visible photoinitiator for free radical polymerization based on erythrosine B derivative

A novel erythrosine B derivative linked with a tertiary amine used as a visible light initiator for free radical polymerization was synthesized and characterized. For comparison, the free hydrophobic erythrosine B derivative was also synthesized and its combination with the tertiary amine was used as the separated two component photoinitiator. The linked initiator exhibited higher photoinitiator efficiency in high viscosity monomer than in low viscosity one, compared with the separated counterpart. Especially, when it was combined with iodonium salt, the further promotion of the photoinitiator efficiency was observed, compared with the separated three component system. It was found that as iodonium salt together with tertiary amine was continuously added to the formula with the linked initiator, the photoinitiator efficiency was dramatically enhanced compared with the same addition to the formula with the separated counterpart, revealing the application potential of the linked initiator. And the continuous addition of either the iodium salt or the tertiary amine to the formula only leaded to the small size increase of the photoinitiator efficiency. These results suggested that there existed an interdependent relationship between iodonium salt and tertiary amine in promoting the photoinitiator efficiency of the dye/amine/iodonium salt system. For these, the corresponding synergistic mechanism was proposed. © 2015 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2015 , 132, 42361.     

The dyes possessing diazine residue as effective photoinitiators of free radicals polymerization

Summary The series of the dyes possessing diazine residue have been investigated as visible-light absorbing photoinitiators of free radical polymerization. The rates of photoinitiation depend on the structure of the dye. Mechanism of the photoinitiation involves the electron transfer process between the dye and the electron donor (co-initiator). The dyes possessing diazine residue in the presence of a suitable electron donor are very effective photoinitiators. This can be attributed to the high quantum yield of their triplet state formation and high rate constant of electron transfer reaction between the dye and electron donor.     

Dyes based on a 1,4‐naphthoquinone skeleton as new type II photoinitiators for radical polymerisation

Photoredox pairs consisting of 1,4‐naphthoquinone dyes and commercially available hydrogen donors (2‐mercaptobenzoxazole, 2‐mercaptobenzothiazole, 2‐mercaptobenzimidazole and 2,5‐dimercapto‐1,3,4‐thiadiazole) are found to be effective initiator systems for the radical polymerisation of trimethylolpropane triacrylate under visible light. The efficiency of these initiator systems is discussed in terms of the free energy change for the electron transfer process from the dye to the hydrogen donor. The results show that the photoinitiation ability of tested photoredox pairs depends on the structure of both the dye and the hydrogen donor.     

The synthesis and characterization of novel,aza-substituted squarylium cyanine dyes

Several squarylium cyanine dyes derived from benzothiazole, benzoselenazole and quinoline were synthesised and the central four member ring functionalized by substitution of one of the oxygen atoms by benzylamine, aniline, 3-iodoaniline, N,N-dimethylhydrazine and 2-aminosulfonic acid groups. All of the ensuing, novel aza-substituted dyes displayed strong absorption within the range 651–709 nm.     

菁染料的研究进展

菁染料以其特有的结构,已成为在光谱增感、光盘存储、生物分析、太阳能电池、无机离子和的测量等方面应用广泛的功能材料之一。本文综述了近几年的研究情况,简单介绍了菁染料的相关知识,和它在合成方面的进展,以及在以上几个方面的应用情况。