The synthesis and properties of naphthopyran– boradiazaindacene conjugates

Gabbutt, Christopher D., Heron, B. Mark, Kilner, Colin and Kolla, Suresh B. (2012) The synthesis and properties of naphthopyran– boradiazaindacene conjugates. Dyes and Pigments, 94 (2). pp. 175-182. ISSN 0143-7208

Abstract

Three new 3,3-diaryl-3H-naphtho[2,1-b]pyran–boradiazaindacene conjugates have been synthesised. The naphthopyran–boradiazaindacene conjugates exhibit a weaker photochromic response relative to the simple naphthopyrans with the photomerocyanines fading relatively quickly. Photochromic switching of the naphthopyran unit results in a decrease in the fluorescence intensity for only the most persistent photomerocyanine. A crystal structure shows that the units are essentially orthogonally disposed and that the boradiazaindacene core is extensively delocalised.

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