含蒽醌基单偶氮染料光电导性质构效研究

由1-氨基蒽醌和不同偶合基合成了九个含蒽醌基的单偶氮染料，并对其进行了 元素分析、红外光谱和紫外光谱表征。紫外光谱研究结果表明，偶合基酰胺芳环上 取代基对偶氮染料的吸收光谱影响不大。当偶合基由2-羟基-3-氨替酰胺萘酚（ Azol～8)变为2-羟基-11氢-苯并咔唑-3-氨替酰胺萘酚（Azo9)时，偶氮染料的吸收 红移了130 nm，最大吸收出现在662 nm处，成为近红外染料。偶氮染料光电导性质 的研究表，偶合基酰胺芳环上取代基吸电子效应越强，光敏性越好，且与Hammett 常数σ有良好的相关性。值得注意的是萘环上扩大一个咔唑环（Azo9)，使偶氮染 料的光敏性提高了几十倍，表明在萘环上扩大共轭环是提高偶氮染料光敏性的一个 良好途径。     

含蒽醌基偶氮染料的合成及其吸收光谱的研究

高产率地合成了一系列1-氨基蒽醌与2-羟基-3-氨替酰氨萘酚(色酚)的偶氮染料, 对其进行了元素分析、红外光谱表征。研究了不同取代基对偶氮染料吸收光谱的影响, 考察了光照条件下该类偶氮染料在DMF稀溶液中吸收光谱的变化特征。     

含蒽醌基偶氮染料的合成及其吸收光谱的研究

高产率地合成了一系列1-氨基蒽醌与2-羟基-3-氨替酰氨萘酚(色酚)的偶氮染料,对其进行了元素分析、红外光谱表征。研究了不同取代基对偶氮染料吸收光谱的影响,考察了光照条件下该类偶氮染料在DMF稀溶液中吸收光谱的变化特征。     

用于有机光导材料的三偶氮颜料的合成研究

以4,4′,4″ 三氨基三苯胺为母体,以含有4种不同取代基的萘酚AS为偶合组分合成了一系列三芳胺三偶氮类有机光导颜料.用元素分析、红外光谱、紫外光谱、质谱和X射线衍射光谱对结构进行了表征.研究结果表明,含硫杂环三偶氮类有机光导颜料在520-730nm之间都有较强吸收.     

双偶氮染料光致增色性质及光电导性研究

自Rau[1]首次报道偶氮染料具有光电导性质以来，偶氮染料一直被作为有应用价值的光电导材料而受到人们的重视[2]．特别是近年来发现，偶氮染料具有优良的光存储性能，引起了人们的极大兴趣[3]．但由于一般的偶氮染料吸收波长较短，难与目前普遍使用的激光器波长响应相匹配，从而限制了其使用．因此，如何从分子设计的角度使偶氮染料的吸收向长波方向移动，是目前国际上研究的热点[4，5]．Law等[5]合成了一些二氨基芴酮与萘酚偶合的双偶氮染料，研究了扩大萘酚萘环共轭体系时其吸收的变化情况．本文合成了几个新的双偶氮染料，研究了茶酚酸…     

芳基汞化合物的性质研究 Ⅵ.某些氯化芳基汞的紫外吸收光谱

本文测定了24种p-,o-,m-取代苯基氯化汞和α-,β-萘基氯化汞在乙醇溶液中的紫外光谱。以苯基氯化汞的吸收带为基准,发现由于对位取代基引起的E吸收带位移增量Δλ(λ_(p-XC_6H_6HgCl)-λ(C_4H_6HgCl))与Hammett取代基常数σ_p间呈现良好的线性关系。作为衡量取代基共轭效应尺度的Δσ(σ_p-σ_m)和Taft参数σ_R均与对位取代苯基氯化汞的E吸收带和B吸收带位移增量呈较好的线性关系所得直线的方向和斜率与取代基的电性有关。对邻位取代苯基氯化汞的吸收光谱进行了讨论。α-,β-萘基氯化汞的紫外光谱的特征表明当HgCl位于β位时,可与萘基发生共轭。     

3-甲基-1,4-二苯氧基-9,10-蒽醌的合成及其光致变色性

合成了3-甲基-1,4-二苯氧基-9,10-蒽醌,其结构经1^H NMR,13^C NMR,IR和MS表征,并通过紫外光谱探讨了其光致变色性,讨论了取代基对蒽醌类化合物光致变色性的影响。     

偏最小二乘计算分光光度法同时测定水中苯胺、联苯胺、α-萘胺和对硝基苯胺

本文利用芳胺的重氮化偶合反应，研究了芳胺重氮化后与甲萘酚形成偶氮染料化合物的显色反应。结果表明,在pH＝12．3的甘氨酸-氧化钠-氢氧化钠缓冲介质中，苯胺、联苯胺、α-萘胺和对硝基苯胺可与甲萘酚偶合形成不同的偶氮化合物，但其吸收光谱严重重叠，采用偏最小二乘法解析重叠的吸收光谱，建立了计算分光光度法同时测定苯胺、联苯胺、α-萘胺和对硝基苯胺的新方法。此法成功地应用于合成水样和环境水样中这几种胺的同时测定，结果令人满意。     

2,2'-二乙炔基-1,1'-联萘为模板构筑的新的环芳化合物的合成及其光学性质

基于2,2'-二取代的联萘衍生物在手性构型上高度稳定的特点,分别以光学活性的(R)-和(S)-2,2'-二乙炔基-1,1'-联萘为模板,设计了2个有趣的拓扑环芳分子四联萘笼状对映异构体(R,R,R,R)-2和(S,S,S,S)-2.其合成路线涉及保护基的控制导入、苯连接桥的链接、保护基的脱去以及偶合成环反应4个步骤.用MS,IR,UV-Vis,1HNMR,13CNMR和元素分析等技术对其进行了表征,并比较了其光学性质.研究结果表明,采用这种模板合成方法能够有效地获得具有单一手性的目标化合物.镜像特征的圆二色(CD)谱和比旋光度[α]D的测定结果清楚地反映了它们的对映异构关系.     

2－羟基2＇烷氧基－1，1＇－联萘化合物的~1HMNR研究

研究了２－羟基－２＇－异丙氧基－１。１－联萘（３）等联萘化合物的~１ＨＮＭＲ谱或ＣＯＳＹ谱。此类化合物因２及２＇位取代基不同，两个萘环上同位质子不再等价，萘环质子峰增至１２组。化合物３~１ＨＮＭＲ谱峰的归属表明，萘环环电流各向异性对另一萘环质子的屏蔽作用与作者早期研究结果［１］一致。２（或２＇）位取代基上的质子的化学位移也与另一萘环平面相对位置有关。     

Ga2O3催化剂上CO2气氛中丙烷脱氢反应的研究

考察了Ga2O3对于丙烷脱氢和CO2气氛脱氢反应的催化性能.结果表明,Ga2O3具有较高的催化活性,其性能优于传统的Cr2O3脱氢催化剂.催化反应可能经过了一个丙烷异裂的过程,其中CO2是通过逆水煤气反应和Boudouard反应来促进催化剂性能的,在高于823K时该促进作用更为明显.催化剂的催化活性和其表面酸密度密切相关,在Ga2O3结构中,四配位Ga3+是其酸位的来源,并通过质子与氧化物的共同作用促进反应进行.催化剂的失活是由于表面的积碳和活性氧的消耗共同造成的.同时还对Ga2O3作为丙烷脱氢反应的催化剂的催化反应机理进行了初步探讨.     

Effect of Photoinduced Size Changes on Protein Refolding and Transport Abilities of Soft Nanotubes

Self‐assembly of azobenzene‐modified amphiphiles (Gly_nAzo, n=1–3) in water at room temperature in the presence of a protein produced nanotubes with the protein encapsulated in the channels. The Gly₂Azo nanotubes (7 nm internal diameter [i.d.]) promoted refolding of some encapsulated proteins, whereas the Gly₃Azo nanotubes (13 nm i.d.) promoted protein aggregation. Although the 20 nm i.d. channels of the Gly₁Azo nanotubes were too large to influence the encapsulated proteins, narrowing of the i.d. to 1 nm by trans‐to‐cis photoisomerization of the azobenzene units of the Gly₁Azo monomers packed in the solid bilayer membranes led to a squeezing out of the proteins into the bulk solution and simultaneously enhanced their refolding ratios. In contrast, photoinduced transformation of the Gly₂Azo nanotubes to short nanorings (<40 nm) with a large i.d. (28 nm) provided no further refolding assistance. We thus demonstrate that pertubation by the solid bilayer membrane wall of the nanotubes is important to accelerate refolding of the denatured proteins during their transport in the narrow nanotube channels.     

电照相用苝四羧酸二酰亚胺系有机光导材料

苝四梭酸二酞亚胺系(PTCDI)化合物具有较强的荧光性能和光稳定性.是一类非常适合作为光电转化材料的有机化合物.目前,该化合物的应用已涉及到太阳能转化材料、电子照像用材料、液晶材料等领域^[1,2],象酞菁、方酸类化合物一样^[3,4],目前国际上已有以苝类化合物制备的有机光导鼓(OPC),但对这类化合物的研究,仅局限在少数几个化合物上,搞清结构与性能之间的关系,对苝类化合物作为光导材料的应用,就显得尤为重要.     

富勒烯掺杂有机光电导材料的光电导性

富勒烯掺杂有机光电导材料的光电导性徐铸德，陈万喜，冷拥军，许小平，李文铸（浙江大学化学系，物理系，杭州，３１００２７）汪茫（浙江大学高分子科学与工程学系）关键词富勒烯，光化学，光物理，光电导体光电导材料在现代静电成像领域中有极广泛的应用，近年来，有机...     

A highly photoconductive poly(vinylcarbazole)/2,4,7-trinitro-9-fluorenone Sol-Gel material that follows a classical charge-generation model

Highly photoconductive properties are reported for organic-inorganic hybrid sol-gel thin film materials composed of a classical poly(vinylcarbazole)/2,4,7-trinitro-9-fluorenone (PVK/TNF) polymeric mixture, entrapped in a SiO(2) matrix, whose pores have been chemically modified by organic functional groups. The highest photosensitivity obtained, 3.4 x 10(-10) cm Omega(-1) W(-1) at E 22 V microm(-)1, at the optimum molar ratio between the active components, TNF, PVK, and SiO(2), is in the range of the highest values ever reported for any PVK/TNF-based classical photoconductive material. It is demonstrated that the PVK/TNF-based sol-gel films follow Onsager's classical charge-generation model. The analysis of the photocurrent efficiency (Phi) of PVK/TNF-based sol-gel films by such a model provides the primary quantum yield of thermalized pair formation and the initial thermalized pair distance, phi(0) = 0.12 and r(0) = 66.1 Angstrom, respectively, for the optimized sample. As a result of Onsager's analysis, a notorious improvement of the photocurrent generation process was achieved for low TNF concentrations.     

一种新型无色DAR成色剂的合成与应用

以N,N' 双 (2 氯 5 正十二烷氧基羰基)苯基丙二酰胺为母体,以2,5 二巯基 1,3,4 噻二唑为吸附基团,以2 三氟乙酰基苯肼作为增强基团合成了一种新型无色DAR成色剂,通过了IR,1HNMR和MS的认证.实验证明,该DAR成色剂能够提高感光度,并且耐老化性能良好.     

Combination of Natural Extracts and Photobiomodulation in Keratinocytes Subjected to UVA Radiation

Natural extracts (NE) with antioxidant properties can minimize the effects of photoaging. Photobiomodulation (PBM) has proven to be a useful tool for the modulation of cell metabolism. Here, we investigate the associations of antioxidants with PBM with the aim of promoting skin rejuvenation. We began with standardization of the experimental protocol. Extracts of chamomile, rosemary, blueberry, green tea, figs, pomegranate and nutwood were tested. A custom irradiation system (366 ± 10 nm) was used to simulate sun exposure. A light emitting diode system (640 ± 12.5 nm) was used for PBM. Viability assessments were performed by the (3‐(4,5‐Dimethyl‐2‐thiazolyl)‐2,5‐diphenyl‐2H‐tetrazolium bromide) MTT assay method. Based on the results, radiant exposure to UVA was defined as 9 and 1 J cm^?2 for PBM. Extract concentrations were established on the basis of dark toxicities, which ranged from 0.01% to 0.3%. The data show that PBM is a promising therapy to restore keratinocytes after UVA damage; however, the detailed mechanism and effects require further exploration. Moreover, although the combination of PBM with NE may be a useful strategy, the choice of a NE is challenging, since the working concentration and other properties, such as photosensitivity, may bring about unwanted results.     

A physiochemical study of azo dyes: DFT based ESIPT process

Azo linked dye derivatives were synthesized and characterized by NMR, mass and elemental analysis. An excited state intramolecular proton transfer (ESIPT) in hydroxy Schiff base has been analyzed, and found that two distinct ground state isomers of I and II are responsible for the observed dual emission. DFT calculation on energy, dipole moment, charge distribution of the rotamers in the ground and excited states support the ESIPT process. PES calculation indicates that the energy barrier for the interconversion of two rotamers is too high in the excited state than the ground state. By varying the addition of base concentration to hydroxy Schiff base, two isobestic points were found which confirm the equilibrium among the trans enol form, anion and the cis enol form. Fluorescence quenching with metal ions reveal that hydroxy Schiff base can be used as a new fluorescence sensor to detect the Cu(2+) ion.     

四苯基卟啉对二苯并咪唑光电导性能的敏化

采用溶剂球磨分散法制备了四苯基卟啉(H₂TPP)/二苯并咪唑(Im-PTC)复合光生材料,用浸涂法将其制成功能分离型双层光导体.采用光致释电法对其光电导性能进行测试,发现在500nm下,由质量分数5%H₂TPP/40%Im-PTC复合光生材料制备的光导体的光敏性比单纯40%的Im-PTC制备的光导体提高了3.5倍,说明H₂TPP对Im-PTC有明显的敏化作用.进一步研究了该复合材料的电子结构,结果表明,H₂TPP与Im-PTC存在分子间的光致电荷转移,从而提高了电荷的光生和分离效率,增强了光导体的光敏性.     

一种新型功能性显影促进剂的照相性能和抗老化性研究

研究了新型功能性显影促进剂照相性能与作用机理.照相性能试验结果表明:显影促进剂M能明显提高感光度而且具有良好的抗老化性能;染料吸收光谱的结果表明:它的使用不影响主成色剂成色染料的吸收光谱.