Conformational States of the Spiropyran Molecule

The form of the potential surface of the ground state was investigated on the basis of indoline spiropyran. As a result of this work the rotamers of an open-ring form of the spiropyran molecule were discovered, and the existence of the most probable rotamers was justified. The 3D potential surface of the ground state of the spiropyran molecule was built. The route of the isomerization of the molecule was discovered and values of barriers for this reaction were found. The part of the isomerization route that is responsible for changing the hybridization of spiroatom from sp3to sp2was found.

Absorptionsuntersuchungen an Spiropyranlösungen im sichtbaren Spektralbereich / Investigations of the Absorption Properties of Spiropyran Solutions in the Visible Spectral Range

It will be shown that the sensitivity of UV-sensitive spiropyran films to visible light is caused by the absorption of the open, coloured form of the spiropyran. The dependence of the fraction of this open to the closed form of the spiropyran from the solvent, HX-donator, polymer-binder, and the structur of the spiropyran molecule has been examined.