New near infrared-sensitive photochromic fluorescing molecules
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The synthesis of new photochromic 2-indolylfulgide dicyanomethylene derivatives is described and their structures confirmed by X-ray crystallography, NMR, mass spectroscopy and elemental analysis. The molecules exhibit two thermally stable isomeric forms, which are only optically interconverted. The ring-open form absorbs between 400 and 550 nm, while the ring-closed form absorbs in the 650 to 700 nm region. The cyclized form emits fluorescence in the near infrared, with a 0.18 quantum yield. The spectroscopic characteristics described make this molecule suitable for optical switching and optical storage devices.
author list (cited authors)
Liang, Y., Dvornikov, A. S., & Rentzepis, P. M.