Abstract:
The electronic absorption spectra of the Schiff bases, in the present not [N,N-di(X-benzylidenes) ethylenediamine], have been investigated in organic solvents of different polarities. The main visible band observed in all of the compounds examined, in ethanol, is assigned to the electronic transitions within the whole molecule of such compounds as an intramolecular charge transfer (CT) interaction. The position of this band is quite sensitive to nature of substituent X. On the other hand, an additional visible band appeared in each of compound II (X= o OH) and compound IV (X=N(CH3)2). This can be attributed to an intermolecular CT transition in case of the former compound and to high stabilization of the polar excited state of later compound by an ethanol molecule. Furthermore, the pKa values of the substituent X, have been determined and related to the geometric flexibility of such compounds.
Page(s):
129-133
DOI:
DOI not available
Published:
Journal: Pakistan Journal of Scientific and Industrial Research, Volume: 37, Issue: 4, Year: 1994