Studiul spectrelor electronice de absorbtie ale 1-metilftalaziniu ilidelor

摘要

The paper presents a theoretical and experimental study concerning the correlation among the structure and stability ofsome 1-methylphtalazinium ylides carbanion mono and disubstituted and the nature of the electronic absorbtion spectra.There are studied the intramolecular charge transfer (ICT) bands determined by the n->pi* transitions,which take place at lesser wavelenghts depending on the negative charge of the ylide carbanion.The protic solvents dispose the hypsochromic shift of the charge transfer band due to the solvation of the dipolar structure of the ylide in fundamental state.The ICT bands of the disubstituted ylide carbanion appear at smaller wavelenghts than in the case of the monosubstituted ylide carbanion,which accord to the higher stability of the first ones.