Photochromic dithienylethene-containing four-coordinate boron(III) compounds with a spirocyclic scaffold
Tony Ho-Ching Fung1, Cheok-Lam Wong1, Wai-Kit Tang1
1Department of Chemistry, The University of Hong Kong, Pokfulam Road, Hong Kong, China. wwyam@hku.hk.
Abstract:
A new series of four-coordinate boron compounds bearing a photochromic dithienylethene-containing C^C ligand and an ancillary N^C ligand have been successfully designed and synthesised. These compounds exhibit reversible photochromism upon photoexcitation with percentage conversions of 71-96% and readily tuneable photocycloreversion quantum yields by convenient modification of the ancillary ligand to turn on the thermally activated upconversion from the lower-lying unreactive excited state to the higher-lying photoreactive excited state.
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