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326 results on '"Gawinecki, Ryszard"'

16. (1Z,3Z)-1,4-di(pyridin-2-yl)buta-1,3-diene-2,3-diol: the planar highly conjugated symmetrical enediol with multiple intramolecular hydrogen bonds

Author

Osmialowski, Borys, Kolehmainen, Erkki, Nissinen, Maija, Krygowski, Tadeusz M., and Gawinecki, Ryszard

Subjects
Chemistry, Organic -- Research, Pyridine -- Physiological aspects, Alkadienes -- Physiological aspects, Glycols -- Physiological aspects, Hydrogen bonding -- Physiological aspects, Solution (Chemistry) -- Physiological aspects, Chloroform -- Physiological aspects, Spectrum analysis -- Usage, Biological sciences, Chemistry
Abstract

Research has been conducted on the (1Z,3Z)-1,4-di(pyridin-2-yl)buta-1,3-diene-2,3-diol. The results of the spectrum analysis of this compound carried out in chloroform solution are reported.

Published
2002

25. Self-organization of 2-acylaminopyridines in the solid state and in solution

Author

Omia?owski, Borys, Kolehmainen, Erkki, Dobosz, Robert, Gawinecki, Ryszard, Kauppinen, Reijo, Valkonen, Arto, Koivukorpi, Juha, and Rissanen, Kari

Subjects
Density functionals -- Usage, Infrared spectroscopy -- Usage, Methyl groups -- Structure, Methyl groups -- Chemical properties, Nuclear magnetic resonance spectroscopy -- Usage, Pyridine -- Structure, Pyridine -- Chemical properties, Chemicals, plastics and rubber industries
Published
2010

26. Influence of bond fixation in benzo-annulated N-salicylideneanilines and their ortho-C([double bond]O)X derivatives (X = C[H.sub.3], N[H.sub.2], OC[H.sub.3]) on tautomeric equilibria in solution

Author

Gawinecki, Ryszard, Osmialowski, Borys, Krygowski, Tadeusz M., Kauppinen, Reijo, Kuczek, Agnieszka, and Kolehmainen, Erkki

Subjects
Hydrogen -- Electric properties, Tautomers -- Electric properties, Biological sciences, Chemistry
Abstract

The effect of the position of benzo-annulation in N-salicylideneaniline on the tautomeric equilibria in solution and the capability of the o-carbonyl group in the 'anilic' benzene ring of these compounds to attract the acidic H-atom are examined. Both the parameters have shown the effect of changes in the molecular topology on tautomeric preferences, although the HOMA values and energies are not a criterion that allows determination of the dominating tautomer.

Published
2007

27. Two (E)-2-({[4-(dialkylamino)phenyl]- imino}methyl)-4-nitrophenols

Author

Valkonen, Arto, Kolehmainen, Erkki, Grzegórska, Aleksandra, Osmialowski, Borys, Gawinecki, Ryszard, and Rissanen, Kari

Subjects
crystal structure, kiderakenne, 2-({[4-(dialkyyliamino)fenyyli]- imino}metyyli)-4-nitrofenoli, 2-({[4-(dialkylamino)phenyl]- imino}methyl)-4-nitrophenol
Abstract

The slow evaporation of analytical NMR samples resulted in the formation of crystals of (E)-2-({[4-(dimethyl­amino)­phenyl]­imino}­methyl)-4-nitro­phenol, C15H15N3O3, (I), and (E)-2-({[4-(diethyl­amino)­phenyl]­imino}­methyl)-4-nitrophenol, C17H19N3O3, (II). Despite the small structural difference between these two N-salicylidene­aniline derivatives, they show different space groups and diverse mol­ecular packing. The mol­ecules of both compounds are close to being planar due to an intra­molecular O-H...N hydrogen bond. The 4-alkyl­amino-substituted benzene ring is inclined at an angle of 13.44 (19)° in (I) and 2.57 (8)° in (II) with respect to the 4-nitro-substituted phenol ring. Only very weak inter­molecular [pi]-[pi] stacking and C-H...O inter­actions were found in these structures. peerReviewed

Published
2012

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