Structural Aspects of Photochromism of the Internally H-Bonded Schiff Bases. "A Minimal Chromophore"
A. Grabowska, K. Kownacki
Institute of Physical Chemistry, Polish Academy of Sciences, Kasprzaka 44/52, 01-224 Warsaw, Poland

and Ł. Kaczmarek
Pharmaceutical Research Institute, Rydygiera 8, 01-793 Warsaw, Poland
Dedicated to Professor Zdzisław Ruziewicz on the occasion of his 70th birthday
Received: July 4, 1995
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The final limiting stage of structural simplification of photochromic Schiff base was reached by the following statement: two molecules, salicyli­dene methylamine and its butyl analogue, show transient absorption bands (at room temperature) peaking at ≈ 22000 cm-1. These bands are charac­teristic of the phenomenon of photochromism. They are similar to the corre­sponding spectra detected earlier for several larger, symmetric systems be­longing to the same family. Experimental characterization of both molecules was compared with the theoretical calculations: geometry optimization and transition energies, performed for enol, keto, and the photochromic form of salicylidene methylamine.
DOI: 10.12693/APhysPolA.88.1081
PACS numbers: 33.10.-n, 33.50.-j