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Ya. Ya. Shluke B. V. Zarina M. Yu. Lidak Yu. P. Shvachkin 《Chemistry of Heterocyclic Compounds》1970,6(4):494-495
6-Chloro-, 6-mercapto-, 6-methylthio-, and 6-amino-9-(3,3-diethoxypropyl)purines, -(6-mercaptopurin-9-yl)--aminobutyric acid, and -(6-methylthiopurin-9-yl)--aminobutyric acid have been synthesized. 相似文献
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Kulakov I. V. Shulgau Z. T. Turdybekov K. M. Turdybekov D. M. Sadyrbekov D. T. 《Russian Journal of General Chemistry》2015,85(2):467-471
Russian Journal of General Chemistry - New 5,6-dihydro-1,3-thiazin-4-one derivatives have been synthesized by one-pot reaction of morpholin-4-amine and adamantan-1-amine with methacryloyl... 相似文献
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Palamarchuk I. V. Shulgau Z. T. Sergazy Sh. D. Zhulikeeva A. M. Gatilov Yu. V. Kulakov I. V. 《Russian Journal of General Chemistry》2021,91(12):2462-2468
Russian Journal of General Chemistry - The intramolecular condensation of chalcone (benzylideneacetophenone) in a DMSO solution in the presence of KOH gave... 相似文献
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Su Kong Chong Boon Tong Goh Yuen-Yee Wong Hong-Quan Nguyen Hien Do Ishaq Ahmad Zarina Aspanut Muhamad Rasat Muhamad Chang Fu Dee Saadah Abdul Rahman 《Journal of luminescence》2012,132(6):1345-1352
High density of silicon nanowires (SiNWs) were synthesized by a hot-wire assisted plasma enhanced chemical vapor deposition technique. The structural and optical properties of the as-grown SiNWs prepared at different rf power of 40 and 80 W were analyzed in this study. The SiNWs prepared at rf power of 40 W exhibited highly crystalline structure with a high crystal volume fraction, XC of ~82% and are surrounded by a thin layer of SiOx. The NWs show high absorption in the high energy region (E>1.8 eV) and strong photoluminescence at 1.73 to 2.05 eV (red–orange region) with a weak shoulder at 1.65 to 1.73 eV (near IR region). An increase in rf power to 80 W reduced the XC to ~65% and led to the formation of nanocrystalline Si structures with a crystallite size of <4 nm within the SiNWs. These NWs are covered by a mixture of uncatalyzed amorphous Si layer. The SiNWs prepared at 80 W exhibited a high optical absorption ability above 99% in the broadband range between 220 and ~1500 nm and red emission between 1.65 and 1.95 eV. The interesting light absorption and photoluminescence properties from both SiNWs are discussed in the text. 相似文献
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Zarina M. Efimenko Anton V. Rozhkov Vitalii V. Suslonov Maxim L. Kuznetsov Vadim Yu. Kukushkin Nadezhda A. Bokach 《Molecules (Basel, Switzerland)》2021,26(18)
The 3-Iodo-1-nitrosonaphthalene-2-ol (I-NON) was obtained by the copper(II)-mediated iodination of 1-nitroso-2-naphthol (NON). The suitable reactants and optimized reaction conditions, providing 94% NMR yield of I-NON, included the usage of Cu(OAc)2·H2O and 1:2:8 CuII/NON/I2 molar ratio between the reactants. The obtained I-NON was characterized by elemental analyses (C, H, N), high-resolution ESI+-MS, 1H and 13C{1H} NMR, FTIR, UV-vis spectroscopy, TGA, and X-ray crystallography (XRD). The copper(II) complexes bearing deprotonated I-NON were prepared as follows: cis-[Cu(I-NON–H)(I-NON)](I3) (1) was obtained by the reaction between Cu(NON-H)2 and I2 in CHCl3/MeOH, while trans-[Cu(I-NON–H)2] (2) was synthesized from I-NON and Cu(OAc)2 in MeOH. Crystals of trans-[Cu(I-NON–H)2(THF)2] (3) and trans-[Cu(I-NON–H)2(Py)2] (4) were precipitated from solutions of 2 in CHCl3/THF and Py/CHCl3/MeOH mixtures, respectively. The structures of 1 and 3–4 were additionally verified by X-ray crystallography. The characteristic feature of the structures of 1 and 3 is the presence of intermolecular halogen bonds with the involvement of the iodine center of the metal-bound deprotonated I-NON. The nature of the I···I and I···O contacts in the structures of 1 and 3, correspondingly, were studied theoretically at the DFT (PBE0-D3BJ) level using the QTAIM, ESP, ELF, NBO, and IGM methods. 相似文献
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Keewah Chan Zarina AspanutBoontong Goh Chornghaur SowBinni Varghese Saadah Abdul RahmanMuhamad Rasat Muhamad 《Applied Surface Science》2011,257(6):2208-2213
In this work, silicon suboxide (SiOx) thin films were deposited using a RF magnetron sputtering system. A thin layer of gold (Au) with a thickness of about 10 nm was sputtered onto the surface of the deposited SiOx films prior to the thermal annealing process at 400 °C, 600 °C, 800 °C and 1000 °C. The optical and structural properties of the samples were studied using scanning electron microscopy (SEM), high-resolution transmission electron microscopy (HRTEM), X-ray diffractometry (XRD), Fourier transform infrared spectroscopy (FTIR) and optical transmission and reflection spectroscopy. SEM analyses demonstrated that the samples annealed at different temperatures produced different Au particle sizes and shapes. SiOx nanowires were found in the sample annealed at 1000 °C. Au particles induce the crystallinity of SiOx thin films in the post-thermal annealing process at different temperatures. These annealed samples produced silicon nanocrystallites with sizes of less than 4 nm, and the Au nanocrystallite sizes were in the range of 7-23 nm. With increased annealing temperature, the bond angle of the Si-O bond increased and the optical energy gap of the thin films decreased. The appearance of broad surface plasmon resonance absorption peaks in the region of 590-740 nm was observed due to the inclusion of Au particles in the samples. The results show that the position and intensity of the surface plasmon resonance peaks can be greatly influenced by the size, shape and distribution of Au particles. 相似文献