103939-79-3Relevant academic research and scientific papers
The Structure of 4-Methoxy-ONN-azoxybenzene and Oxygen Transfer Reaction of 4-Methoxyazoxybenzenes in Sulfuric Acid
Yamamoto, Jiro,Yamashita, Hiroshi,Miyagawa, Hisato,Abe, Toshio,Tsukihara, Tomitake
, p. 3340 - 3342 (1990)
The structure of 4-methoxy-ONN-azoxybenzene(1α) has been determined by X-ray analysis.In sulfuric acid 1α gave a rearrangement product 4-hydroxy-4'-methoxyazobenzene, together with 4-methoxyazobenzene and 4-methoxy-NNO-azoxybenzene.
Low excitation energy band of 4-hydroxyazobenzene derivatives
Mahmoud, M. R.,Ibrahim, S. A.,Hamed, M. A.
, p. 729 - 734 (1983)
The low excitation energy band appeared in the electronic spectra of some 4-hydroxyazobenzene derivatives is assigned to an electronic transition of the type η-?*.It is concluded that 4-hydroxyazobenzene derivatives exist mainly in the true azo form.On the other hand, the visible spectra of the azo compound; 4-hydroxy-2-carboxyazobenzene is interpreted on the basis that this compound exists in a tautomeric equilibrium of the type azo hydrazone, originating from the carboxyl group at the ortho position to the azo one.
Polarity dependent photoisomerization of ether substituted azodyes: Synthesis and photoswitching behavior
Gan, Siew Mei,Pearl, Zynia Fernandes,Yuvaraj,Lutfor,Gurumurthy, Hegde
, p. 875 - 880 (2015)
Two new ether substituted azodyes were synthesized and characterized by different spectral analysis such as 1H NMR, 13C NMR, FTIR and UV/Vis. Synthesized compounds were used to study the photoisomerization phenomenon by using UV-Vis
Combined main-chain/side-chain liquid crystalline polymer with main-chain on the basis of "jacketing" effect and side-chain containing azobenzene groups
Xie, He-Lou,Wang, Shao-Jie,Zhong, Guan-Qun,Liu, Yi-Xin,Zhang, Hai-Liang,Chen, Er-Qiang
, p. 7600 - 7609 (2011)
Combining the concept of "flexible spacer" which can bring liquid crystalline (LC) properties to the side-chains and the side-group "jacketing" effect which can result in main-chain with rod-like conformation, we have synthesized a new combined main-chain
ELECTROPHILIC CATALYSIS BY CYCLODEXTRINS
Ye, Hongping,Rong, Ding,D'Souza, Valerian T. D.
, p. 5231 - 5234 (1991)
The catalysis of an aromatic electrophilic substitution reaction by cyclodextrins is reported.The catalysis can be explained on the basis of the electron rich character of the interior of the cyclodextrin cavity.Kinetic analysis of this reaction in the presence of cyclodextrins indicate binding and catalysis.
Synthesis and mesomorphic behaviour of achiral four-ring unsymmetrical bent-core liquid crystals: Nematic phases
Paul, Manoj Kumar,Kalita, Gayatri,Laskar, Atiqur Rahman,Debnath, Somen,Gude, Venkatesh,Sarkar, Dipika Debnath,Mohiuddin, Golam,Varshney, Sanjay Kumar,Nandiraju Rao
, p. 78 - 89 (2013)
Achiral four ring unsymmetrical bent-core liquid crystals derived from 3-amino-2-methylbenzoic acid have been designed and synthesized with an imine, ester and photochromic azo linking moieties. These hockey-stick shape resembling bent molecules possess a
Effect of methoxy group instead of polar group in the nematic phase of four-ring bent-core liquid crystals
Nafees, Amina,Kalita, Gayatri,Paul, Manoj Kumar,Sinha, Aloka,Rao, Nandiraju V. S.
, p. 7001 - 7006 (2015)
Two achiral four-ring bent-core liquid crystal possessing an alkoxy chain at one end of the molecules and methoxy group at the other end are investigated by using the optical polarizing microscope, electro-optical studies, and dielectric spectroscopy. Bot
Photoswitchable NIR-Emitting Gold Nanoparticles
Bonacchi, Sara,Cantelli, Andrea,Battistelli, Giulia,Guidetti, Gloria,Calvaresi, Matteo,Manzi, Jeannette,Gabrielli, Luca,Ramadori, Federico,Gambarin, Alessandro,Mancin, Fabrizio,Montalti, Marco
, p. 11064 - 11068 (2016)
Photo-switching of the NIR emission of gold nanoparticles (GNP) upon photo-isomerization of azobenzene ligands, bound to the surface, is demonstrated. Photophysical results confirm the occurrence of an excitation energy transfer process from the ligands to the GNP that produces sensitized NIR emission. Because of this process, the excitation efficiency of the gold core, upon excitation of the ligands, is much higher for the trans form than for the cis one, and t→c photo-isomerization causes a relevant decrease of the GNP NIR emission. As a consequence, photo-isomerization can be monitored by ratiometric detection of the NIR emission upon dual excitation. The photo-isomerization process was followed in real-time through the simultaneous detection of absorbance and luminescence changes using a dedicated setup. Surprisingly, the photo-isomerization rate of the ligands, bound to the GNP surface, was the same as measured for the chromophores in solution. This outcome demonstrated that excitation energy transfer to gold assists photo-isomerization, rather than competing with it. These results pave the road to the development of new, NIR-emitting, stimuli-responsive nanomaterials for theranostics.
Side Chain Liquid Crystalline Polyoxetanes with a Spacer-Separated Azobenzene Moiety. I. Preparation and Characterization
Motoi, Masatoshi,Noguchi, Kunimasa,Arano, Akio,Kanoh, Shigeyoshi,Ueyama, Akihiko
, p. 1778 - 1789 (1993)
Several oxetane derivatives carrying the azobenzene moiety at the C-3 position of the oxetane ring through the spacer arms of differing lengths were prepared by a substitution reaction of the corresponding bromide or p-toluenesulfonate residue of the oxetane with 4-hydroxyazobenzenes.The polymers of these oxetane derivatives were readily obtained by cationic ring-opening polymerization using the adequately increased amount of a THF*BF3 complex as an initiator at 20-30 deg C.The liquid crystalline property of the polymers thus obtained were examined by differential scanning calorimetry and by optical polarized microscopy.From these measurements the influences of the p'-substituted azobenzene and of the spacer arm on the liquid crystalline property were found.
Thermal and photo alignment behavior of polymers in multiply-layered films composed of polyethylene imines having azobenzene side chain groups and polyvinyl alcohol
Kamruzzaman, Mohammad,Ogata, Tomonari,Kuwahara, Yutaka,Ujiie, Seiji,Kurihara, Seiji
, p. 32 - 41 (2010)
Polyethylene imines having 4-methoxyazobenezene group through methylene spacer groups (PEI6M) were synthesized and their photochemical, thermooptical as well as photoorientational behavior were investigated. PEI6M films showed high dichroism and order par
