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Crystal and molecular structures of 1,1-bis(methylthio)-4-(2-pyridyl)-2,3,5-triaza-1,3-pentadiene and its 5-phenyl derivative

Główka M., Martynowski D., Olczak A., Kozłowska K., Ołubek Z., Orlewska C., Foks H.

Polish Journal of Chemistry

1999

vol. 73 nr 5

845-851

Structures of the two dimethylthiomethylene-2-pyridinecarboxamide hydrazones have been examined spectroscopially and by X-ray diffraction to establish the dominant tautometric form and conformation. The two crystal structures are very similar with approximately planar conformation and intramolecular hydrogen bond between 4-imine group as hydrogen donor and pyridyl N atom as an acceptor. Several significant differences found may be easily explained by phenyl substitution in one of the compounds. The benzene ring in compound 2 is twisted by about 40o in relation to the mean molecular plane due to packing forces. An interesting feature of the structures is the deviation of the pyridyl ring by 11-14o from the mean 2,3,5-triaza-1,3-pentadiene plane in the two structures, despite the intramolecular hydrogen bond spanning the two fragments. It agrees with the elongation of C(4)-pyridine bond to 1.488 A, which corresponds with the lack of conjugation between p electrons of the pyridine ring and a lone pair at adjacent N(4) atom.

Crystal structure of 2-(1,4,5,6-tetrahydropyrimidin-2-yl)phthalazinone-1 hydroiodide

Główka M.L., Książek W., Staszewska A., Kozłowska K., Ołubek Z., Krężel I

Polish Journal of Chemistry

1998

Vol. 72, nr 8

2009-2013

X-ray crystal study of the 2-(1,4,5,6-tetrahydropyrimidin-2-yl)phthalazinone-1 hydroiodide showed different hydrogen bonding network and packing than those observed in the crystal of two other phthalazinones-1, comprising either smaller (4,5-dihydroimidazolyl) or larger (4,5,6,7-tetrahydrodiazepinyl) ring substituent in position 2 and having very similar crystal structures.