Synthesis, characterization and photoluminescence properties of graphene oxide functionalized with azo molecules
作者:R DEVI、G PRABHAVATHI、R YAMUNA、S RAMAKRISHNAN、NIKHIL K KOTHURKAR
DOI:10.1007/s12039-013-0536-1
日期:2014.1
Two different azo molecules functionalized graphene oxide (GO) through an ester linkage have been synthesized for the first time. Chemical structure of the azo-GO hybrids was confirmed by Fourier transform infrared spectroscopy and UV-visible spectroscopy. The GO functionalized with 5-((4-methoxyphenyl)azo)-salicylaldehyde was further characterized by scanning electron microscopy (SEM), transmission electron microscopy (TEM), and atomic force microscopy (AFM). The SEM studies demonstrated that the morphology of the azo-GO hybrid was found to be similar to the GO sheets but slightly more wrinkled. Further, TEM image of azo-GO indicates some dark spots on the GO sheets due to azo functionalization. AFM results also reveal that the azo functionalization increases the thickness of GO sheet to 4–5 nm from 1.2–1.8 nm. Both the azo-hybrids show absorption band around 379 nm due to the π–π* transition of the trans azo units. Photoluminescence spectra of azo-GO hybrids show a strong quenching compared with azo molecules due to the photoinduced electron or energy transfer from the azo chromophore to the GO sheets. It also reveals strong electronic interaction between azo and GO sheets.
Jolly, V. S.; Singh, Laxmi; Pendse, Swati, Journal of the Indian Chemical Society, 1992, vol. 69, # 2, p. 105 - 106
作者:Jolly, V. S.、Singh, Laxmi、Pendse, Swati
DOI:——
日期:——
Design, synthesis, and biological evaluation of 1,4,7,
<scp>8‐tetrahydro‐5</scp>
<i>H</i>
‐furo[3,4‐
<i>b</i>
]pyrazolo[4,3‐
<i>e</i>
]pyridin‐5‐one‐based azo dyes
作者:Seyed Fakhreddin Kamaloddin‐Ezabadi、Nosrat O. Mahmoodi、Manouchehr Mamaghani、Meysam Pasandideh‐Nadamani
DOI:10.1002/jhet.4640
日期:——
8-tetrahydro-5H-furo[3,4-b]pyrazolo[4,3-e]pyridin-5-ones containing azo group were synthesized by a three-component one-pot reaction of a preformed azoaldehyde (AZA), tetronicacid, and 5-aminopyrazole in ethanol in the presence of triethylamine under microwave irradiation. The structures of the products were confirmed by spectroscopic data. This method has the advantages of simpler operation to prepare a new
采用三组分一锅法合成了含偶氮基团的1,4,7,8-四氢-5-呋喃并[3,4-b]吡唑并[4,3-e]吡啶-5-酮在微波辐射下,三乙胺存在下,乙醇中预制的偶氮醛 (AZA)、季酮酸和 5-氨基吡唑。产物的结构由光谱数据证实。该方法具有制备多官能团结构的新型二氢吡啶(1,4-DHPs)环操作简单、效率高、反应时间短、激发原子经济化学等优点。所有产品都进行了抗菌活性评估。一些化合物对革兰氏阴性菌(大肠杆菌)和革兰氏阳性菌(藤黄微球菌和金黄色葡萄球菌)细菌与红霉素和四环素相比。与维生素 C 相比,考虑了合成化合物的抗氧化活性 (AOA)。一些化合物表现出最高的 AOA,甚至高于维生素 C。