Insights into the Origin of Solid-State Photochromism and Thermochromism of N-Salicylideneanils: The Intriguing Case of Aminopyridines.
(2009) Chemistry: A European Journal — Vol. 15, n° 17, p. 4327-4342 (2009)
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- Abstract
- The relationships between the crystal structure and optical properties of switchable N-salicylideneanils have been revised and discussed on the basis of new experimental results and a computational approach. N-Salicylidene-3-aminopyridine (L(3)) is a versatile thermo- and photochromic molecule. It also exhibits an infinitely slow thermal back relaxation (k=9.9x10(-8) s(-1)) after photoswitching that is suitable for optical memories. Contrary to reports in the literature, N-salicylidene-4-aminopyridine (L(4)) is exclusively thermochromic. To explain these unexpected optical properties in the solid state, crystallography combined with UV-visible spectroscopic data was exploited. L(3) was also used as a ligand in new thermochromic coordination complexes [M(CH(3)OH)(2)(L(3))(2)(NCX)(2)], in which M(II)=Fe, Co, Ni, Cu or Mn and X=S or Se (1-6), which allowed the fine-tuning of the electron density in the photochromic moiety. The influence of the coordination through the nitrogen of the pyridine ring is also fully discussed.
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Robert, F., Naik, A., Tinant, B., Robiette, R., & Garcia, Y. (2009). Insights into the Origin of Solid-State Photochromism and Thermochromism of N-Salicylideneanils: The Intriguing Case of Aminopyridines. Chemistry: A European Journal, 15(17), 4327-4342. https://doi.org/10.1002/chem.200801932 (Original work published 2009)