In our work, we studied thin nickel films deposited by electroless plating for use as a barrier and seed layer in the through-silicon vias (TSV) technology. El-Ni coatings were deposited on a copper ...substrate from the original electrolyte and with the use of various concentrations of organic additives in the composition of the electrolyte. The surface morphology, crystal state, and phase composition of the deposited coatings were studied by SEM, AFM, and XRD methods. The El-Ni coating deposited without the use of an organic additive has an irregular topography with rare phenocrysts of globular formations of hemispherical shape and a root mean square roughness value of 13.62 nm. The phosphorus concentration in the coating is 9.78 wt.%. According to the results of the X-ray diffraction studies of El-Ni, the coating deposited without the use of an organic additive has a nanocrystalline structure with an average nickel crystallite size of 2.76 nm. The influence of the organic additive is seen in the smoothening of the samples surface. The root mean square roughness values of the El-Ni sample coatings vary within 2.09-2.70 nm. According to microanalysis data the phosphorus concentration in the developed coatings is ~4.7-6.2 wt.%. The study of the crystalline state of the deposited coatings by X-ray diffraction made it possible to detect two arrays of nanocrystallites in their structure, with average sizes of 4.8-10.3 nm and 1.3-2.6 nm.
A new multicomponent reaction for regioselective synthesis of substituted 1,2,4-triazolo1,5-
a
pyrimidines using aminotriazoles, β-ketoglutaric acid dimethyl ester, and dimethylformamide dimethyl ...acetal was implemented. The selective reduction of 1,2,4-triazolo-1,5-
a
pyrimidines to dihydro derivatives and the use of triazolo pyrimidines as starting compounds in multicomponent synthesis of dihydropyrido3,4-
е
1,2,4triazolo1,5-
a
pyrimidinecarboxylates was demonstrated.
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Recyclization of N-arylitaconimides with hydrazine in dioxane at room temperature selectively leads to 2-(3-oxopyrazolidin- 4-yl)acetanilide derivatives in moderate to good yields. ...The similar reaction with phenylhydrazine proceeds with the simultaneous formation of isomeric 3- and 5-oxo- 1-phenylpyrazolidine-containing acetanilides.
A method has been developed for the preparation of new pyrazolo3,4-
b
pyridines and tetrahydropyrazolo3,4-
b
quinolinones by the reactions of 5-amino-1-aryl-1
H
-pyrazole-4-carbonitriles with ...aliphatic and cyclic 1,3-dicarbonyl compounds in the presence of anhydrous tin(IV) chloride.
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The heterocyclization of 1,2-diamino-4H-phenylimidazole with α-acylacrylonitriles affords cleanly 7-amino-2-R-5- phenylimidazo1,5-bpyridazine-3-carbonitriles. The strating ...α-acylacrylonitriles can be generated in situ from 3-oxo-3-(het)arylpropanenitriles and triethylorthoformate or dimethylformamide dimethyl acetal, and the products can be prepared in one pot.
A method has been developed for the preparation of new pyrazolo3,4-bpyridines and tetrahydropyrazolo3,4-bquinolinones by the reactions of 5-amino-1-aryl-1H-pyrazole-4-carbonitriles with aliphatic and ...cyclic 1,3-dicarbonyl compounds in the presence of anhydrous tin(IV) chloride.
