ISSN:
0021-8383
Schlagwort(e):
Chemistry
;
Organic Chemistry
Quelle:
Wiley InterScience Backfile Collection 1832-2000
Thema:
Chemie und Pharmazie
Notizen:
The U.V.-vis-spectroscopic Properties of 3,5-disubstituted 1,3,4-Oxadiazoline-2-imines. I. The Influence of the Substituents and the Solvent on the AbsorptionThe u.v.-vis data of 38 derivatives of 3,5-disubstituted 1,3,4-oxadiazoline-2-imines, measured in 12 different solvents, are discussed. The long wave absorption bands have charge-transfer character, the observed solvatochromic shifts correlate with the solvent parameter ET. The assumed intramolecular charge-transfer upon excitation is polarized in the direction R1—N3—C5—R2. Derivatives which are donor-substituted in the 3-position of the oxadiazolinimine cycle (R1) and acceptor-substituted in the 5-position (R2) show a typical push-pull effect. In this case bathochromic and hyperchromic effects on the long-wave absorption bands result. On the other hand, R1 is a donor and R2 is an acceptor substituent the excitation energy is increasing.
Zusätzliches Material:
3 Ill.
Materialart:
Digitale Medien
URL:
http://dx.doi.org/10.1002/prac.19813230402
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