✦ LIBER ✦
Single versus double proton transfer in the photochromic Schiff bases. Electronic spectroscopy and synthesis of model compounds
✍ Scribed by Krzysztof Kownacki; u̵kasz Kaczmarek; Anna Grabowska
- Publisher
- Elsevier Science
- Year
- 1993
- Tongue
- English
- Weight
- 566 KB
- Volume
- 210
- Category
- Article
- ISSN
- 0009-2614
No coin nor oath required. For personal study only.
✦ Synopsis
Symmetric, photochromic Schiffbases were studied. Their photophysics, experimental and calculated dipole moments (molecular mechanics and INDO/S) were compared with model compounds representing "one half" of the parent molecule. The photochromic transients were identified as monoketotautomers of a zwitterionic character -products of a one-proton transfer reaction along the internal H bond. It was found unexpectedly that the same molecule in the So state reveals a strong tendency to remain symmetric, opposite to its behaviour on the S, level.