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The molecular structure and absorption spectra of monothio- and dithio-naphthalimides were compared to their naphthalimide analogues using AM1, PM3 and ZINDO/S semiempirical quantum chemical methods. The substitution of the 4R-naphthalimide oxygen atoms by sulphur atoms resulted in a red-shift of the absorption spectra by Δλmax60-65 and 100-140 nm, respectively. The thionated naphthalimide derivatives do not show observable fluorescence due to intersystem crossing to the triplet -states localised at the CS groups. The -absorption bands of monothioimides are located at 525-580 nm (ε=60-80) and those for dithioimides at 535-560 nm (ε=140-390) and 628-686 nm (ε=34-68). None of these transitions are solvent sensitive. The -transitions of N-phenylthioimides have also a small contribution from -states due to a partial conjugation between CS group and π-electronic system of the N-phenyl ring. As a result, the bands of aromatic substituted N-phenylthioimides are red-shifted as compared to those of the aliphatic N-methyl-thioimides. 相似文献
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The Surface Structure of a TiNi-Based Powder Alloy Manufactured by the Method of Diffusion Sintering
Anikeev S. G. Artyukhova N. V. Khodorenko V. N. Kaftaranova M. I. Yakovlev E. V. Gunther V. E. 《Russian Physics Journal》2020,63(3):484-490
Russian Physics Journal - The structural features of the surface of a TiNi-based powder alloy produced by diffusion sintering are studied. Two-dimensional porous samples based on a TiNi powder... 相似文献
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Artyukhova N. V. Kaftanarova M. I. Anikeev S. G. Khodorenko V. N. Garin A. S. Monogenov A. N. Gunther V. É. 《Russian Physics Journal》2019,62(3):527-533
Russian Physics Journal - An investigation of the influence of reaction- and diffusion-induced interactions in the system of PV-N55Т45 TiNi-based powders and activating Co and Ni additions... 相似文献
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A method has been developed for the quantitative estimation of ricinine in extracts and meal from two castor-oil plant seed tosters.Institute of the Chemistry of Plant Substances, Academy of Sciences of the Republic of Uzbekistan, Tashkent, Fax (3712) 62 73 48. Translated from Khimiya Prirodnykh Soedinenii, No. 2, pp. 271–274, March–April, 1994. 相似文献
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A method has been developed for the quantitative estimation of ricinine in extracts and meal from two castor-oil plant seed tosters. 相似文献
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Artyukhova E. E. Patsenker L. D. Baumer V. N. Musatov V. I. 《Russian Journal of Organic Chemistry》2002,38(8):1222-1223
Russian Journal of Organic Chemistry - 相似文献