Search Results - "Wandas, M."

Determination of N-acetylation degree in chitosan using Raman spectroscopy by Zając, A., Hanuza, J., Wandas, M., Dymińska, L.

“…[Display omitted] •Spectroscopic determination of deacylation degree of chitosan has been proposed.•Equations for determination of degree of deacetylation have…”
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Theoretical and experimental NMR data of 3,5-dinitro-2-(2-phenylhydrazinyl)pyridine and of its 4- and 6-methyl derivatives by Wandas, M., Talik, Z.

“…•The NMR spectra of 3,5-dinitro-2-(2-phenylhydrazinyl)-pyridine and its methyl derivatives are discussed.•GIAO/DFT procedure is used for calculation of…”
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Molecular and crystal structures, vibrational studies and quantum chemical calculations of 3 and 5-nitroderivatives of 2-amino-4-methylpyridine by Bryndal, I., Kucharska, E., Sąsiadek, W., Wandas, M., Lis, T., Lorenc, J., Hanuza, J.

“…[Display omitted] ► The crystal structures of 3- and 5-nitroderivatives of 2-amino-4-methylpyridine were studied. ► These structures exhibit layered…”
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Comprehensive physicochemical studies of a new hybrid material: 2-Amino-4-methyl-3-nitropyridinium hydrogen oxalate by Bryndal, I., Kucharska, E., Wandas, M., Lorenc, J., Hermanowicz, K., Mączka, M., Lis, T., Marchewka, M., Hanuza, J.

“…[Display omitted] •A new organic–organic salt and its deuterium analogue were characterized.•The DSC measurements exhibit that AMNPO undergoes a reversible…”
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The role of hydrogen bonds in the crystals of 2-amino-4-methyl-5-nitropyridinium trifluoroacetate monohydrate and 4-hydroxybenzenesulfonate – X-ray and spectroscopic studies by Bryndal, I., Marchewka, M., Wandas, M., Sąsiadek, W., Lorenc, J., Lis, T., Dymińska, L., Kucharska, E., Hanuza, J.

“…•Two new organic–organic salts, AMNP-TFA and AMNP-HBS, were obtained and characterized.•NH⋯O bonds are formed between the acidic unit and pyridinium cation in…”
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Experimental and simulated 1H and 13C NMR spectra (GIAO/DFT approach) and molecular and crystal structures of dimethyl-dinitro-azo- and dimethyl-dinitro-hydrazo-pyridines by Wandas, M., Kucharska, E., Michalski, J., Talik, Z., Lorenc, J., Hanuza, J.

“…► The 1H and 13C NMR spectra of the 4,4′(or 6,6′)-dimethyl-3,3′-dinitro-2,2′-azo- and hydrazo- pyridine. ► Application of GIAO/DFT procedure for calculation of…”
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Molecular structure and vibrational spectra of 3 (or 4 or 6)-methyl-5-nitro-2-pyridinethiones: FT-IR, FT-Raman and DFT quantum chemical calculations by Wandas, M., Lorenc, J., Kucharska, E., Ma̧czka, M., Hanuza, J.

“…IR and Raman spectra (RS) of polycrystalline 3‐(or 4 or 6)‐methyl‐5‐nitro‐2‐pyridinethione have been measured and analyzed by means of density functional…”
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Crystal structure, vibrational and NMR studies and chemical quantum calculations of 2-phenylazo-5-nitro-6-methyl-pyridine (C 12H 10N 4O 2) by Michalski, J., Kucharska, E., Wandas, M., Hanuza, J., Waśkowska, A., Mączka, M., Talik, Z., Olejniczak, S., Potrzebowski, M.J.

“…Synthesis of 2-phenylazo-5-nitro-6-methyl-pyridine is described. Its X-ray structure is reported and discussed in terms of the molecular conformation of this…”
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Polar aspects of intramolecular interactions in 2-amino-5-nitro-4-methylpyridines and 2-amino-3-nitro-4-methylpyridines by Wandas, M., Puszko, A., Pawelka, Z.

“…The dipole moments of twelve 2‐N‐substituted amino‐5‐nitro‐4‐methylpyridines (I‐XII) and three 2‐N‐substituted amino‐3‐nitro‐4‐methylpyridines (XIII‐XV) were…”
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Order–disorder phase transitions and their influence on the structure and vibrational properties of new hybrid material: 2-Amino-4-methyl-3-nitropyridinium trifluoroacetate by Lorenc, J., Bryndal, I., Syska, W., Wandas, M., Marchewka, M., Pietraszko, A., Lis, T., Mączka, M., Hermanowicz, K., Hanuza, J.

“…New organic–organic salt, 2-amino-4-methyl-3-nitropyridinium trifluoroacetate, has been synthesised and characterised by FT-IR, FT-Raman, DSC and single…”
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Experimental and simulated super(1H and ) super(1)3C NMR spectra (GIAO/DFT approach) and molecular and crystal structures of dimethyl-dinitro-azo- and dimethyl-dinitro-hydrazo-pyridines by Wandas, M, Kucharska, E, Michalski, J, Talik, Z, Lorenc, J, Hanuza, J

“…The super(1H and ) super(1)3C NMR spectra of the 4,4'(or 6,6')-dimethyl-3,3'-dinitro-2,2'-azo- and hydrazo-pyridine have been measured in the solid state and…”
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IR spectra of 2-alkylamino-and alkylnitramino-3-or 5-nitro-4-methylpyridine derivatives by Wandas, M., Puszko, A.

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Nitrogen NMR Shieldings of Some Nitro Derivatives of 2-Amino-4-methylpyridine Systems by Wandas, M., Puszko, A., Biedrzycka, Z., Witanowski, M.

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Ultraviolet absorption spectra of 2-alkylamino-, 2-phenylamino-,2-morpholino-3-(or 5)-nitro-4-methylpyridines and some 2-alkylamino-3,5-dinitro-4-methylpyridines by Wandas, M., Puszko, A., Ban-Oganowska, H.

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Absorption spectra of 2-alkylnitramino-substituted 4(or 6)-methyl-5-nitropyridines and 2-(N-alkyl-N-nitrosoamino)-substituted 4(or 6)-methyl-3(or 5)-nitropyridines by Ban-Oganowska, H., Puszko, A., Palasek, B., Wandas, M.

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1H NMR spectra of some nitro derivatives of 2-alkylamino-, 2-phenylamino-, 2-piperidyl-, 2-morpholyl-, 2-(N-alkyl-N-nitrosoamino)-, and 2-alkylnitramino-4(or 6)-methylpyridines by Wandas, M., Palasek, B., Puszko, A., Ban-Oganowska, H.

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