Double-helix pattern in a model compound of non-linear optical polymers1
Molecules of the title compound, 3,3'-[4-(4-nitrophenyl-diazenyl) phenylimino]dipropionic acid, C18H18N4O 6 a model compound of second-order non-linear optically active polymers, form helicoidal rows via hydrogen bonding between carboxy groups. Pairs of helices are wrapped around the common axis in a double-helix arrangement unprecedented in dicarboxylic acids. The lateral packing of the helices shows an interdigitated antiparallel arrangement of the chromophore units.
Correlation analysis of acid-base and completing properties of N,N-di(2-carboxyethyl)anilines
The composition and apparent formation constants of the complexes of N,N-di(2-carboxyethyl)-anilines with Cu(II), Ni(II), and Co(II) ions were determined spectrophotometrically and potentiometrically. The Hammett correlation analysis of the acidic ionizat
Skorik,Neudachina,Vshivkov
p. 285 - 290
(2007/10/03)
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