十二烷基硫酸根复合物的制备及电子转移催化剂应用

制备了三种聚烷基紫精-十二烷基硫酸根复合物(PRV-LS),用紫外光谱、顺磁共振波谱研究了复合物的氧化、还原行为,将复合物用作电子转移催化剂于异相体系(CH_2Cl_2-H_2O;1:1,20mL)考察了其诱导的偶氮苯还原。结果表明:复合物在异相条件被还原时,聚烷基紫精自由基(PRV~ ·)在LS成份的作用下发生相转移,复合物具有良好的诱导偶氮苯还原的能力。     

推拉型有机化合物的非线性特性研究

合成一种新的推拉型偶氮化合物并将掺入ＰＭＭＡ中制成光学薄膜器件，用Ｚ扫描技术测量了该材料的非线性折射率，用ＤＦＷＭ装置研究了该材料在可见光长波区光存储特性，获得了良好的实时和短时存储信息，存储功率密度小于０．１Ｗ／ｃｍ＾２。分析了这种非共振吸收区光存储机理。     

A novel photo‐responsive organogel based on azobenzene

A novel triarmed cis‐1, 3, 5‐cyclohexanetricarboxamides gelator, functionalized by three azobenzene moieties grafted with three long alkyl chains, was designed and synthesized. The gelator can gel most of the organic solvents in low concentration. The morphologies of the xerogels show one‐dimensional aggregated bundles or helical fibres. The azobenzene groups in the gel state form H‐type aggregation and perform expected trans–cis photoisomerization with a gel to sol phase transition upon irradiation of UV light. The main driving force for gelation is intermolecular hydrogen bonding between amides and π–π interaction of azobenzene moieties. Copyright © 2008 John Wiley & Sons, Ltd.     

Crystallographic report: Crystal structure of bis(2,4,6‐tri‐tert‐butylphenolato‐O) bis(tetrahydrofuran‐O) samarium (N,N‐η2‐azobenzene) diethyl ether solvate

Reaction of divalent Sm(OAr)₂(THF)₃ (Ar = C₆H₂‐tert‐Bu₃‐2,4,6; THF = tetrahydrofuran) with one equivalent of azobenzene in THF and crystallization of the product in diethyl ether afforded the title complex (ArO)₂(THF)₂Sm(η²‐N₂Ph₂)·Et₂O in good yield. In the complex, the N? N bond length for the azobenzene species is lengthened. The two Sm? N bonds are equivalent, and their bond lengths are intermediate between the donor bond and the single bond. Copyright © 2005 John Wiley & Sons, Ltd.     

Synthesis of Bis Dansyl-Modified β-Cyclodextrin Dimer Linked with Azobenzene and Its Fluorescent Molecular Recognition

Flexible dimeric host, 4,4'-azobenzenediamido-bis-{6-(2-dansyl-aminoethyl)6-deoxy--cyclodextrin}(beta; -1), has been synthesized in order to investigate itsfluorescent molecular sensory system transforming photoisomerization. Photoisomerizationof -1 was performed with photoirradiation by a 500W-Xelamp using a Corning 7-37 filter. Host beta; -1 showed puremonomer fluorescence, exhibiting a decrease in fluorescence intensity on accommodationof the guest, and the extent of fluorescence variation with a guest was employed to displaythe sensing ability of -1, in which the sensing parameter( I/I⁰)was used to describe the sensing ability. Host -1could detect chenodeoxycholic acid, ursodeoxycholic acid and hyodeoxycholic acid withhigh selectively. The behaviors of the appended moieties of -1during host-guest complexation were studied by induced circular dichroism (ICD) andfluorescence spectra and MM2 energy-minimized structure. The ICD and fluorescenceintensities of -1 decreased on the addition of a guest.The guest-induced variations in the ICD and fluorescence spectra, and MM2 energy-minimized structure suggested that the dansyl moieties of -1 worked as a hydrophobic cap when a host-guest complexation occurred.     

Supramolecular Chemistry of Cyclodextrin-Peptide Hybrids: Azobenzene-Tagged Peptides

AC17, which is composed of 17 amino acids and has an azobenzene moiety but has no cyclodextrin (CD) unit in the side chain, exhibits 54% helix content. However, AC17, which has both trans-azobenzene and -CD, shows 82% helix content. This result suggests that the helix structure is stabilized by host (CD)-guest (azobenzene) bridge in the side chain of the peptide. The helix content changed by trans-cis photoisomerization as shown by 64% helix content for AC17 in its cis form. This result suggests that cis-azobenzene unit is excluded from the -CD cavity, thus resulting in the smaller helix content. The helix contents for AC17, which has both azobenzene and -CD, are 94% in the cis form and 87% in the trans form, suggesting that the cis form is included in the -CD cavity. Azobenzene-tagged CD-peptide hybrids with histidine unit were also prepared and photoregulation of catalytic activity in ester hydrolysis was examined.     

偶氮苯聚合物薄膜光致表面调制效应研究（Ⅱ）

实验观测了DP-AN系列偶氮苯聚合物薄膜在Ar^ 激光（488nm）激发下的光致表面调制效应。给出488nm激光激发条件下,含有不同偶氮苯侧基的聚合物的光致表面调制效应的数值。在前文^[1]工作的基础上分析比较了DP-AN系列和BP-AN系列偶氮苯聚合物光致表面调制效应的不同及其产生的原因。给出影响偶氮苯聚合物光致表面调制效应的因素。     

偶氮苯光色基元修饰的杯芳烃的荧光性能和液晶行为

偶氮苯光色基元修饰的杯芳烃的荧光性能和液晶行为;偶氮苯;杯［４］芳烃;热致液晶;荧光     

光致变色液晶聚合物的光致再取向性能研究进展

光致变色分子经掺杂或键合作用嵌在液晶聚合物中可形成光致变色液晶聚合物,在线性偏振光或非偏振光的照射下,此物质中光致变色分子的构型变化会引起整个液晶分子的二维或三维光致再取向的形成,本文综述了光致变色液晶聚合物的光致再取向的近期研究进展.     

1-偶氮苯-3-(3-硝基-5-氯-2-吡啶)三氮烯的合成及其与镍(Ⅱ)离子的显色反应

合成了新显色剂1-偶氮苯-3-(3-硝基-5-氯-2-吡啶)三氮烯(ABNCPDT),并研究了它与镍的显色反应.在pH 10.5的Na2B4O7-NaOH缓冲溶液中,TX-100表面活性剂存在下,试剂与镍生成4∶1型红色配合物.配合物的最大吸收峰位于540 nm,表观摩尔吸光系数为1.86×105L.mol-1.cm-1.N i2+浓度在0~480μg/L范围内符合比尔定律.用拟定方法测定铝合金中微量镍,结果满意.