Luminescent properties of new organic reagents, 2,6-diaminopyrimidines and benzimidazoles were investigated. The luminescence intensity of 1-amino-3-(3-hydroxypropyl)pyrido[1,2-a]benzimidazole-2,4-dicarbonitrile (І) 3-[2-(hydroxymethyl)phenyl]-1-imino-1H-pyrido[2,1-b][1,3]benzothiazole-2,4dicarbonitrile (ІІ) 3-[2,6-diamino-5-(1,3-benzothiazol-2-yl)-4-pyrimidinyl]-1-propanol (ІІІ) was decreased with adding hydrochloric acid. Reagent 3-[6-amino-5-(1,3-benzothiazol-2-yl)-1-methyl-2-imino-1,2dihydro-4-pyrimidinyl]-1-propanol (IV) was resistant to HCl. The reagent IV with platinum(II) and palladium(II) forms non-luminescent complexes in acidic media. It was found that IV with Pt(II) forms a
Synthetic approach to fused azasultams with 1,2,4-thiadiazepine framework via base promoted protocols has been developed. 1H-Azole-2-carboxylates and N-(chloromethyl)-N-methylmethanesulfonamide were used as ambiphilic building blocks in the one-pot and two-step reaction sequences. Chemical behavior of the obtained azasultams in reactions with amines, hydrazine, DMFDMA, and NaBH4 was investigated. An enamino ketone derived from an azasultam was exploited in the synthesis of new pyrazole and pyrimidine heterocycles.
ABSTRACT:Here we report a simple two-step synthesis of magnetite nanoparticles (NPs) coated with silica shell functionalized with 3-aminopropyl groups. The content of surface amino groups within the range of 0.7-2.8 mmol g .
In this work, the adsorption of platinum (II, IV) chloride complexes from acidic solutions on silica gel modified with quaternary ammonium salts (QAS) was studied. The uptake of the platinum chloride complexes is caused by the formation of ionic (QAS þ ) 2 [PtCl x ] 2À (x ¼ 4, 6) associates on the surface of silica gel. The isotherms of adsorption are fitted by the Langmuir model. The maximum capacity for [PtCl 4 ] 2À and [PtCl 6 ] 2À is 0.99 and 1.13 mmol/g, correspondingly. The respective adsorption constants K L ¼ 6.8 and 10 Â 10 5 l/mol prove the high affinity of the adsorbates to the QAS-modified surface. Platinum metal nanoparticles supported on the surface of the silica gel were prepared by reducing the adsorbed platinum (II, IV) complexes. Such nanoparticles functioning at the moderate temperature regime have demonstrated a reasonable catalytic activity for the hydrogen and oxygen recombination, and an excellent stability over 35 cycles of the reaction.
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