105299-45-4Relevant articles and documents
The photochemical behavior of polyhydroxy styrene with azofragments containing free methacrylic double bounds
Nadtoka, Oksana,Vretik, Lyudmyla,Gavrylko, Tetiana,Syromyatnikov, Volodymyr
, p. 115 - 123 (2017)
Polymer material which combines advantages of photoaligning azo-compounds with thermal stability of the induced anisotropy provided by free methacryloyl groups was synthesised. FTIR spectroscopy was employed for clarification its photochemical behavior. T
Multiresponsive hydrogels based on xylan-type hemicelluloses and photoisomerized azobenzene copolymer as drug delivery carrier
Cao, Xuefei,Peng, Xinwen,Zhong, Linxin,Sun, Runcang
, p. 10000 - 10007 (2014)
Stimulus-responsive hydrogels, which can undergo significant physicochemical changes in response to various physical or chemical stimuli, have drawn wide attention in many fields. In this study, novel photoresponsive hydrogels prepared by free radical cop
A Twist-Bend Nematic (NTB) Phase of Chiral Materials
Gorecka, Ewa,Vaupoti, Nataa,Zep, Anna,Pociecha, Damian,Yoshioka, Jun,Yamamoto, Jun,Takezoe, Hideo
, p. 10155 - 10159 (2015)
New chiral dimers consisting of a rod-like and cholesterol mesogenic units are reported to form a chiral twist-bend nematic phase (NTB) with heliconical structure. The compressibility of the NTB phase made of bent dimers was found to be as large as in smectic phases, which is consistent with the nanoperiodic structure of the NTB phase. The atomic force microscopy observations in chiral bent dimers revealed a periodicity of about 50 nm, which is significantly larger than the one reported previously for non-chiral compounds (ca. 10 nm).
Hydrogen-bonded supercoil self-assembly from achiral molecular components with light-driven supramolecular chirality
Wang, Yangyang,Zhou, Deyan,Li, Haining,Li, Ruiru,Zhong, Yueyao,Sun, Xuan,Sun, Xun
, p. 6402 - 6409 (2014)
Supercoils self-assembled from two achiral molecular components have been synthesized in order to better understand the structure and functionality of this chiral supramolecular association. The two-component synthon is a complementary hydrogen-bond pair having one melamine core and three photoaddressable azobenzene units, which self-assembled into long and helical fibers with intrinsic conformational chirality. Hierarchical self-assembly was presented where one-dimensional helixes bundled into a higher order optically active supercoil structure, leading to spontaneous chiral symmetry breaking and amplification of chirality. Circular dichroism (CD) spectroscopy, transmission electron microscopy (TEM) and atomic force microscopy (AFM), as well as X-ray diffraction (XRD) techniques reveal the chiral nature of the assembly. Accordingly, a plausible mechanism of a hierarchical self-assembly process has been proposed, which presents a valid approach for constructing supramolecular chirality from achiral molecular building blocks through non-covalent interactions. The morphology and chirality of the supercoils demonstrate photoresponsivity, which is induced from the photoisomerization of the azobenzene components within the self-assembled nanostructures. Furthermore, the supercoil is a highly proton-conductive material because of its highly ordered structure and the proton transfer between the H-bonded melamine and azobenzene units within this two-component association.
Photocontrolled translational motion of a microscale solid object on azobenzene-doped liquid-crystalline films
Kausar, Abu,Nagano, Hiroto,Ogata, Tomonari,Nonaka, Takamasa,Kurihara, Seiji
, p. 2144 - 2147 (2009)
(Figure Presented). On the move: Irradiation of azobenzene-doped liquid crystalline films with UV/Vis light results in the photocontrolled translational motion of microscale solid object on the surface, which occurs through cis-trans isomerization of the
Supramolecular functionalized polybenzoxazines from azobenzene carboxylic acid/azobenzene pyridine complexes: Synthesis, surface properties, and specific interactions
Mohamed, Mohamed Gamal,Hsiao, Chi-Hui,Hsu, Kuo-Chih,Lu, Fang-Hsien,Shih, His-Kang,Kuo, Shiao-Wei
, p. 12763 - 12772 (2015)
In this study we synthesized Azo-COOH BZ, a new benzoxazine derivative containing both azobenzene and carboxylic acid units, through the reaction of 4-(4-hydroxphenylazo)benzoic acid (Azo-COOH, itself prepared through a diazonium reaction of 4-aminobenzoi
Synthesis of multiring azo-benzoic acid liquid crystalline molecules and their special photosensitive property
Zheng, Min-Yan,Wei, Yong-Sheng,Geng, Wei,Guo, Nai-Ni,Zhang, Ping
, p. 1 - 13 (2015)
10 new rod-like azo benzoic acid liquid crystals belonged to three series have been prepared, in which trans-cyclohexyl benzene, biphenyl or bi-trans-cyclohexyl carboxylic acid mesogenic cores with ethyl, n-propyl, n-butyl or n-pentyl substituents were connected with azo benzoic acid. Meantime, a simple method was developed in synthesizing compounds bearing both ester and carboxyl groups in one-step reaction. All these compounds have been characterized on the basis of their spectral data, differential scanning calorimeter (DSC) and hot stage polarizing optical microscope (HS-POM). All these compounds have higher thermo-stability. 8 of these compounds have liquid crystalline properties. Their temperature ranges of mesophase have not been obtained, resulting from all the compounds decomposed before their clearing points. Although these compounds are photosensitive in solution under illumination of UV light (365nm), they can't do trans-cis isomerization in their mesophses, indicating the super stabilities of the trans isomer in mesophase.
A Carbon Dioxide Bubble-Induced Vortex Triggers Co-Assembly of Nanotubes with Controlled Chirality
Zhang, Ling,Zhou, Laicheng,Xu, Na,Ouyang, Zhenjie
, p. 8191 - 8195 (2017)
It is challenging to prepare co-organized nanotube systems with controlled nanoscale chirality in an aqueous liquid flow field. Such systems are responsive to a bubbled external gas. A liquid vortex induced by bubbling carbon dioxide (CO2) gas was used to stimulate the formation of nanotubes with controlled chirality; two kinds of achiral cationic building blocks were co-assembled in aqueous solution. CO2-triggered nanotube formation occurs by formation of metastable intermediate structures (short helical ribbons and short tubules) and by transition from short tubules to long tubules in response to chirality matching self-assembly. Interestingly, the chirality sign of these assemblies can be selected for by the circulation direction of the CO2 bubble-induced vortex during the co-assembly process.
Synthesis and optical properties of poly[4-methacryloxy-(4′-carboxy)-azobenzene]
Sypniewska,Skowronski,Popielarski,Savchenko,Krupka,Smokal,Derkowska-Zielinska
, p. 178 - 185 (2018)
In the present work, the homopolymer built from the free radical polymerization of methacrylic monomer incorporating an azobenzene side-group has been synthesized and structurally characterized. The optical properties such as refractive index, extinction
Influence of helical twisting power on the photoswitching behavior of chiral azobenzene compounds: Applications to high-performance switching devices
Alam, Md. Zahangir,Yoshioka, Teppei,Ogata, Tomonari,Nonaka, Takamasa,Kurihara, Seiji
, p. 2641 - 2647 (2007)
Five photochromic chiral azobenzene compounds and one nonphotochromic chiral compound were synthesized and characterized by IR, 1H NMR spectroscopy, and elemental analysis. Cholesteric liquid crystalline phases were induced by mixing of the non
Optically active and photoswitchable Tr?ger's base analogs
Kazem-Rostami, Masoud
supporting information, p. 7751 - 7755 (2019/05/27)
The enantiomer separation of a chiral Tr?ger's base analog and its use, as an optically active building block, in the construction of molecular superstructures are presented. Various strategies are illustrated here for the attachment of azo photoswitches to the Tr?ger's base scaffold without racemizing its stereogenic centers. The resulting optically active photoswitches introduced chirality, thermochromic, and phototunable properties to an achiral liquid crystal host. The doped mesophases reflected specific wavelengths of light owing to the formation of self-organized helical superstructures. These observations illustrate the potential use of the presented products as liquid crystal dopants.
Synthesis of Kojic Ester Derivatives as Potential Antibacterial Agent
Sie, Carolynne Zie Wei,Ngaini, Zainab,Suhaili, Nurashikin,Madiahlagan, Eswaran
, (2018/06/04)
The search for lead product with beneficial pharmacological properties has become a great challenge and costly. Extraction and synthetic modification of bioactive compounds from natural resources has gained great attention and is cost effective. In this study, kojic acid was produced from fungal fermentation, using sago waste as substrate, and chemically incorporated with chalcones and azobenzene to form a series of kojic ester derivatives and evaluated for antibacterial activities. Kojic ester bearing halogenated chalcone demonstrated active inhibition against Staphylococcus aureus compared to that of standard ampicillin. The inhibition increased as the electronegativity of halogens decreased, while incorporation of azobenzene derivatives on kojic acid backbone demonstrated fair antibacterial activity against Escherichia coli with minimum inhibitory concentration (MIC) of 190-330 ppm. The presence of C=C and N=N reactive moieties in both chalcone and azo molecules contributed to the potential biological activities of the kojic acid ester.
